{"gene":"CAMKK2","run_date":"2026-06-09T22:57:17","timeline":{"discoveries":[{"year":2008,"finding":"CaMKK2 functions as an AMPKα kinase in the hypothalamus and forms a unique signaling complex with AMPKα and AMPKβ subunits. Acute pharmacological inhibition of CaMKK2 in wild-type but not CaMKK2 null mice inhibits appetite and reduces NPY/AgRP mRNAs, establishing CaMKK2 as an upstream activator of AMPK in hypothalamic energy-sensing neurons.","method":"CaMKK2 knockout mice, pharmacological inhibition (STO-609), co-immunoprecipitation of signaling complex, NPY/AgRP mRNA measurement","journal":"Cell metabolism","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic KO plus pharmacological inhibition with specific rescue, replicated across multiple readouts in a high-impact study","pmids":["18460329"],"is_preprint":false},{"year":2013,"finding":"NMDA receptor activation or membrane depolarization raises intracellular Ca²⁺, which activates AMPK in a CAMKK2-dependent manner in cortical/hippocampal neurons. AMPK then phosphorylates Tau on the KxGS motif S262, and Aβ42 oligomer-induced dendritic spine loss is blocked by inhibiting CAMKK2 or AMPK, or by expressing Tau S262A.","method":"Neuronal knockdown/overexpression of CAMKK2 and AMPK, pharmacological inhibition, in vivo APP transgenic mouse model, dendritic spine counting","journal":"Neuron","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal genetic and pharmacological approaches in vitro and in vivo, replicated in transgenic AD model","pmids":["23583109"],"is_preprint":false},{"year":2017,"finding":"GDH1-derived α-ketoglutarate activates CaMKK2 by enhancing its binding to the substrate AMPK, placing CaMKK2 downstream of GDH1 and upstream of AMPK in LKB1-deficient lung cancer cells to provide anoikis resistance.","method":"Co-immunoprecipitation, RNAi knockdown, pharmacological inhibition, patient-derived xenograft models","journal":"Molecular cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP and genetic KD with functional rescue, single lab","pmids":["29249655"],"is_preprint":false},{"year":2015,"finding":"CaMKK2 signals through CaMKIV to control liver cancer cell growth, and serves as a scaffold to assemble CaMKIV with components of the mTOR/S6K pathway, stimulating protein synthesis. Kinase-inactive CaMKK2 mutants fail to rescue growth defects from CaMKK2 loss, demonstrating kinase-activity dependence.","method":"RNAi knockdown, ectopic expression of wild-type vs. kinase-inactive mutants, in vivo tumor models, STO-609 pharmacological inhibition","journal":"Hepatology","confidence":"High","confidence_rationale":"Tier 2 / Strong — kinase-dead mutant rescue experiments plus in vivo tumor models, multiple orthogonal approaches","pmids":["25847065"],"is_preprint":false},{"year":2017,"finding":"CaMKK2 directly phosphorylates Akt at Thr-308 in a Ca²⁺/CaM-dependent manner, as shown by in vitro reconstitution with recombinant CaMKK2 and recombinant Akt. In ovarian cancer cells, CaMKK2 knockdown or inhibition reduces Akt phosphorylation at Thr-308 and Ser-473 additively with PDK1 knockdown.","method":"In vitro kinase assay with recombinant proteins, siRNA knockdown, pharmacological inhibition, intracellular Ca²⁺ chelation","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution with recombinant proteins plus cellular epistasis, single lab but multiple orthogonal methods","pmids":["28634229"],"is_preprint":false},{"year":2012,"finding":"Essential amino acid withdrawal raises cytosolic Ca²⁺ from extracellular medium and intracellular stores, activating AMPK via CaMKK-β, which then phosphorylates ULK1 at Ser-555 to initiate autophagy. CaMKK-β is also required for mTORC1 inactivation under amino acid starvation.","method":"siRNA knockdown of CaMKK-β and AMPK, pharmacological inhibition (STO-609), Ca²⁺ chelation, ULK1 phosphorylation assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic KD and pharmacological inhibition with multiple downstream readouts, pathway epistasis established","pmids":["23027865"],"is_preprint":false},{"year":2022,"finding":"Aβ42 oligomer-driven over-activation of the CAMKK2-AMPK kinase dyad mediates synaptic loss through coordinated phosphorylation of MFF (driving mitochondrial fission) and ULK2 (driving mitophagy). Spatially restricted structural remodeling of dendritic mitochondria in CA1 apical tufts was CAMKK2-AMPK-dependent.","method":"Transgenic AD mouse model, human APP knockin ES cell-derived neurons, genetic KO of AMPK subunits, phosphorylation assays for MFF and ULK2","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple genetic models, human ES-derived neurons, and in vivo mouse model with mechanistic phosphorylation readouts","pmids":["35915085"],"is_preprint":false},{"year":2019,"finding":"CaMKK2 is highly expressed in intratumoral myeloid cells in breast cancer. CaMKK2 deletion in macrophages reduces their ability to suppress T cell proliferation and increases chemokine expression that recruits effector CD8+ T cells; CaMKK2 inhibition blocks tumor growth in a CD8+ T cell-dependent manner.","method":"Conditional Camkk2-/- mice, BMT, in vitro macrophage-T cell co-culture suppression assays, pharmacological inhibition, flow cytometry","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic KO with functional cellular assays and in vivo tumor models, multiple orthogonal methods","pmids":["31164648"],"is_preprint":false},{"year":2021,"finding":"CaMKK2 and AMPK promote macropinocytosis in pancreatic cancer-associated fibroblasts downstream of cytosolic Ca²⁺ elevation and in cooperation with ARHGEF2; macropinocytosis supports CAF fitness and provides secreted amino acids that promote tumor cell survival.","method":"Genetic knockdown of CaMKK2 and ARHGEF2, pharmacological inhibition, Ca²⁺ measurements, macropinocytosis assays, in vivo PDAC tumor models","journal":"Cancer discovery","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic KD plus pharmacological inhibition plus in vivo models with mechanistic pathway dissection","pmids":["33653692"],"is_preprint":false},{"year":2009,"finding":"CaMKK2 and CaMKIV are required for CREB phosphorylation in cerebellar granule cells, which drives Bdnf transcription necessary for granule cell migration from the external to internal granule cell layer. Re-expression of CaMKK2 in null neurons restores pCREB and BDNF, and exogenous BDNF rescues migration defects in vitro.","method":"CaMKK2 null and CaMKIV null mice, in vivo/in vitro cerebellar development assays, rescue by BDNF addition, pCREB immunostaining","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic KO with in vivo and in vitro rescue experiments, multiple orthogonal endpoints","pmids":["19605628"],"is_preprint":false},{"year":2020,"finding":"PKA signaling inactivates CaMKK2 by phosphorylating three conserved serine residues: Ser495 directly impairs Ca²⁺-calmodulin activation; Ser100 and Ser511 mediate recruitment of 14-3-3 adaptor proteins that maintain CaMKK2 in the inactivated state by preventing dephosphorylation of phospho-Ser495. Crystal structure of 14-3-3ζ bound to a diphosphorylated CaMKK2 peptide reveals cooperative binding at canonical (Ser511) and noncanonical (Ser100) sites.","method":"In vitro kinase assays, site-directed mutagenesis, protein crystallography (crystal structure of 14-3-3ζ/CaMKK2 peptide complex), cellular PKA stimulation","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure plus mutagenesis plus in vitro kinase assays, multiple orthogonal methods in one study","pmids":["32913128"],"is_preprint":false},{"year":2018,"finding":"14-3-3γ directly interacts with the kinase domain of CaMKK2 and the region containing the inhibitory phosphorylation site Thr145 in the N-terminal extension. 14-3-3 binding does not inhibit catalytic activity of phosphorylated CaMKK2 but slows its dephosphorylation. Crystal structures of phosphopeptides containing CaMKK2 14-3-3 binding motifs bound to 14-3-3 were determined.","method":"Enzyme activity measurements, SAXS, time-resolved fluorescence spectroscopy, protein crystallography, phosphopeptide binding assays","journal":"Biochimica et biophysica acta. General subjects","confidence":"High","confidence_rationale":"Tier 1 / Moderate — crystal structure plus SAXS plus kinase activity assays, single lab with multiple orthogonal methods","pmids":["29649512"],"is_preprint":false},{"year":2016,"finding":"In LKB1-null tumor cells, elevated intracellular Ca²⁺ activates CAMKK2, which phosphorylates AMPK-α at Thr172 causing G1 cell-cycle arrest. Expression of a truncated, Ca²⁺/calmodulin-independent CAMKK2 mutant phenocopies LKB1 re-expression. Dominant-negative AMPK or double AMPK-α KO prevents Ca²⁺-induced G1 arrest, placing CAMKK2 upstream of AMPK in this pathway.","method":"LKB1-null cell lines, constitutively active CAMKK2 expression, dominant-negative AMPK, CRISPR double KO of AMPK-α1/α2, Ca²⁺ ionophore treatment, cell-cycle analysis","journal":"Molecular cancer research","confidence":"High","confidence_rationale":"Tier 2 / Strong — epistasis established by genetic rescue and KO with multiple cell lines and orthogonal genetic tools","pmids":["27141100"],"is_preprint":false},{"year":2017,"finding":"Genotoxic stress (etoposide) activates the AMPK-α1 isoform specifically within the nucleus via nuclear Ca²⁺ increase and CaMKK2; activation is independent of ATM and LKB1. Nuclear AMPK-α1 activation promotes G1 arrest and enhances cell survival after etoposide, effects abolished by AMPK-α1/α2 double KO.","method":"Pharmacological inhibition (STO-609), AMPK-α1/α2 double KO, subcellular fractionation, Ca²⁺ chelation, cell-cycle analysis, viability assays","journal":"Molecular cancer research","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic KO plus pharmacological inhibition plus Ca²⁺ chelation with multiple orthogonal readouts","pmids":["29133590"],"is_preprint":false},{"year":2022,"finding":"A molecular complex of Cav1.2/CaMKK2/CaMK1a forms within caveolae of vascular myocytes. Ca²⁺ influx through Cav1.2 directly activates CaMKK2; CaMKK2 then phosphorylates CaMK1a, which translocates to the nucleus to phosphorylate CREB, driving expression of genes involved in chemotaxis, leukocyte adhesion, and vascular remodeling. Disruption of caveolae or CaMKK2 inhibition abrogates these effects.","method":"Live Ca²⁺ imaging with genetically encoded indicators, co-immunoprecipitation of Cav1.2/CaMKK2/CaMK1a complex, caveolin1-KO mice, STO-609 pharmacological inhibition, mesenteric artery pressure loading model","journal":"PNAS","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP of protein complex, live imaging, genetic KO, and pharmacological inhibition with in vivo vascular model","pmids":["35412911"],"is_preprint":false},{"year":2015,"finding":"Thr85 is a CaMKK2 autophosphorylation site that generates autonomous (Ca²⁺-independent) activity, providing molecular memory of prior Ca²⁺ stimulation. The disease-linked T85S mutation fails to generate autonomous activity upon phosphorylation at Ser85, causing partial loss of CaMKK2 activity. Lithium (GSK3 inhibitor) rescues autonomous activity in the T85S mutant. CaMKK2 null mice display anxiety and manic-like behavioral disturbances.","method":"In vitro autophosphorylation assays, site-directed mutagenesis (T85S), autonomous activity measurements, GSK3 inhibition with lithium, behavioral assays in CaMKK2 null mice","journal":"Scientific reports","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro kinase assays with mutagenesis plus in vivo behavioral phenotyping, multiple orthogonal methods","pmids":["26395653"],"is_preprint":false},{"year":2018,"finding":"CaMKK2 localizes around focal adhesions at the ends of contractile stress fibers and is enriched at sites of mechanosensitive Ca²⁺ influx. CaMKK2 acts upstream of AMPK to phosphorylate VASP, inhibiting actin polymerization at focal adhesions and enabling contractile stress fiber maturation. Inhibition of CaMKK2 or mechanosensitive Ca²⁺ channels impairs AMPK and VASP phosphorylation and abolishes contractile bundles.","method":"Subcellular localization imaging, pharmacological inhibition of CaMKK2 and Ca²⁺ channels, AMPK and VASP phosphorylation assays, traction force microscopy","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct localization with functional consequence, pharmacological pathway dissection, and force measurements","pmids":["29972773"],"is_preprint":false},{"year":2020,"finding":"CaMKK2/AMPK signaling is required for assembly and maintenance of peripheral actomyosin bundles at epithelial cell-cell contacts; these bundles arise from lateral fusion of transverse arc stress fibers. Inhibition of CaMKK2/AMPK disrupts tension-maintaining actomyosin bundles, redistributes cellular forces, and causes defects in monolayer integrity and epithelial identity.","method":"Pharmacological inhibition of CaMKK2 and AMPK, live-cell imaging of actin dynamics, traction force microscopy, monolayer integrity assays","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — mechanosensitive pathway dissection with live imaging and force measurements, multiple orthogonal readouts","pmids":["32209483"],"is_preprint":false},{"year":2012,"finding":"In prostate cancer, the androgen receptor (AR) induces CaMKK2 mRNA/protein expression and causes nuclear translocation of CaMKK2. CaMKK2 in turn maintains AR transcriptional activity (PSA expression, AR response element-driven reporter), cyclin D1, and Rb hyperphosphorylation. Loss of CaMKK2 reduces cell proliferation and causes G1 arrest, establishing an AR-CaMKK2 feedback loop.","method":"siRNA knockdown of CaMKK2, dihydrotestosterone stimulation, androgen withdrawal, reporter assays, cell-cycle analysis, LNCaP cells","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal genetic and pharmacological approaches with well-defined molecular readouts in established PCa model","pmids":["22654108"],"is_preprint":false},{"year":2011,"finding":"CaMKK2 is expressed in preadipocytes where it acts as an AMPKα kinase. Inhibition or deletion of CaMKK2 in preadipocytes accelerates adipogenic differentiation by reducing Pref-1 and Sox9 mRNA, releasing suppression of C/EBPβ and C/EBPδ. AMPK activation reverses the enhanced differentiation caused by CaMKK2 loss.","method":"CaMKK2 null preadipocytes, AICAR-mediated AMPK activation rescue, mRNA expression analysis, adipogenesis assays","journal":"Endocrinology","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic KO with pharmacological rescue and multiple molecular readouts, epistasis established","pmids":["21862616"],"is_preprint":false},{"year":2012,"finding":"CaMKK2 is expressed in liver and its liver-specific deletion lowers blood glucose and improves glucose tolerance. CaMKK2 KO hepatocytes produce less glucose, show decreased mRNA for PGC-1α and gluconeogenic enzymes (G6Pase, PEPCK), and fail to respond to catecholamine stimulation. The mechanism may involve diminished HDAC5 phosphorylation necessary for PGC-1α promoter derepression.","method":"Liver-specific Cre-lox CaMKK2 deletion, primary hepatocyte isolation, glucose production assays, qRT-PCR, adrenergic stimulation, HDAC5 phosphorylation","journal":"Molecular endocrinology","confidence":"High","confidence_rationale":"Tier 2 / Strong — tissue-specific conditional KO with multiple mechanistic readouts and metabolomic profiling","pmids":["22240810"],"is_preprint":false},{"year":2011,"finding":"CaMKK2 functions as a cell-intrinsic inhibitor of granulocytic fate commitment in myeloid progenitors. CaMKK2 null bone marrow produces excess mature granulocytes; re-expression of CaMKK2 in null CMPs rescues aberrant granulopoiesis. Overexpression of CaMKK2 in 32D myeloblasts impedes G-CSF-induced granulocyte differentiation in a kinase-activity-dependent manner.","method":"Camkk2-/- mice, bone marrow transplantation, ectopic CaMKK2 expression (wild-type vs. kinase-dead), 32D differentiation assays, flow cytometry","journal":"Journal of leukocyte biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic KO with BMT rescue and kinase-dead mutant epistasis","pmids":["21816924"],"is_preprint":false},{"year":2011,"finding":"PKA pathway promotes inclusion of CaMKK2 exon 16, generating two splice variants (with/without exon 16) that are differentially phosphorylated by PKA and have distinct effects on neuronal morphology: the +E16 variant promotes neurite branching while the -E16 variant promotes neurite elongation. CaMKKβ1 is required for forskolin-induced neurite growth.","method":"Alternative splicing reporter assays, PKA selective inhibitor H89, RNAi knockdown, overexpression in B35 neuroblastoma cells, neurite morphology analysis","journal":"RNA biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional reporter assays and RNAi with morphological readouts, single lab","pmids":["21957496"],"is_preprint":false},{"year":2016,"finding":"CaMKK2 suppresses muscle regeneration by inhibiting myoblast proliferation and differentiation in an AMPK-dependent manner. CaMKK2 overexpression causes AMPK-mediated cell-cycle arrest (Cdc2-Tyr15 phosphorylation) and represses PGC-1α transcription to suppress differentiation; overexpression of CaMKK2 in mouse muscle by electroporation impairs freeze injury-induced regeneration.","method":"Overexpression and knockdown of CaMKK2 in C2C12 myoblasts, AMPK agonist/antagonist, in vivo electroporation of CaMKK2, freeze injury model","journal":"International journal of molecular sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — loss- and gain-of-function with in vivo validation, single lab","pmids":["27783047"],"is_preprint":false},{"year":2018,"finding":"CAMKK2 promotes prostate cancer independently of AMPK via increased lipogenesis: CAMKK2 deletion reduces expression of ACC and FASN by a post-transcriptional mechanism (potentially decreased protein translation), while AMPK activation opposes this by inhibiting lipogenesis. CAMKK2 and AMPK thus have opposing effects on lipogenesis and prostate cancer progression.","method":"Genetic Camkk2 deletion in Pten-null mouse prostate cancer model, AMPKβ1 deletion, human PCa cell lines, lipogenesis assays, protein expression analysis","journal":"Cancer research","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo genetic model with opposing-gene epistasis and mechanistic lipogenic pathway analysis","pmids":["30242113"],"is_preprint":false},{"year":2021,"finding":"AR-driven CaMKK2-AMPK-ULK1 signaling promotes autophagy in prostate cancer in an mTOR-independent manner. Inhibition of CAMKK2 disrupts autophagy and impairs tumor growth in multiple CRPC mouse models; AMPK-ULK1 inhibition also blocks autophagy and colony formation.","method":"Genetic and pharmacological disruption of CAMKK2, AMPK, and ULK1; autophagy flux assays; CRPC mouse models; patient tumor sample analysis","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple genetic/pharmacological approaches with in vivo validation and patient sample correlation","pmids":["33531625"],"is_preprint":false},{"year":2023,"finding":"CaMKK2 mediates actin cytoskeletal dynamics to promote metastasis through a CaMKK2-PDE1A-PKG1-VASP pathway: CaMKK2 increases expression of phosphodiesterase PDE1A, which hydrolyzes cGMP to decrease PKG1 activity; reduced PKG1 activity decreases VASP phosphorylation, and hypophosphorylated VASP binds F-actin to promote cell movement.","method":"Genetic disruption and pharmacological inhibition of CaMKK2, PDE1A expression analysis, cGMP/PKG1 activity assays, VASP phosphorylation, murine xenograft metastasis models of TNBC and HGSOC","journal":"Cancer research","confidence":"High","confidence_rationale":"Tier 2 / Strong — pathway dissection with multiple genetic and pharmacological tools plus in vivo xenograft models","pmids":["37335130"],"is_preprint":false},{"year":2020,"finding":"CAMKK2-CAMK4 signaling regulates receptor-mediated transferrin trafficking and iron homeostasis. Loss of CAMK4 causes abnormal post-translational modifications and turnover of transferrin in cerebellum and liver. CAMKK2/CAMK4 deletion in HEK293 cells alters intracellular Ca²⁺ homeostasis and disrupts molecular interactions of transferrin with its receptor-associated protein complexes.","method":"CAMK4-/- mice, CRISPR/Cas9-deleted CAMKK2 and/or CAMK4 HEK293 cells, transferrin trafficking assays, Ca²⁺ measurements, protein interaction analysis","journal":"Cell communication and signaling","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic KO in vivo and in vitro with mechanistic trafficking assays, single lab","pmids":["32460794"],"is_preprint":false},{"year":2021,"finding":"CaMKK2 knockdown leads to identification of Gemin4 as a direct interactor of CaMKK2 capable of also binding COPI subunits. CaMKK2 knockdown reduces δ-COP protein and causes Golgi expansion, ER stress, abortive autophagy, and impaired lysosomal acidification—phenotypes of COPI depletion—suggesting CaMKK2 sustains cell proliferation through effects on endomembrane trafficking.","method":"CAMKK2 knockdown, proteomics identification of interactors, co-immunoprecipitation with COPI subunits, imaging of Golgi and lysosomes, ER stress assays","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — Co-IP and knockdown with imaging phenotypes, multiple readouts but mechanistic link to COPI inferred","pmids":["34725334"],"is_preprint":false},{"year":2020,"finding":"Fusicoccin A and related fusicoccanes stabilize the interaction between 14-3-3γ and a diphosphorylated CaMKK2 peptide, enhancing binding affinity of full-length phosphorylated CaMKK2 to 14-3-3γ and slowing CaMKK2 dephosphorylation, thereby maintaining CaMKK2 in its phosphorylation-mediated inhibited state. Crystal structures of ternary 14-3-3/fusicoccane/CaMKK2-peptide complexes were determined.","method":"Crystal structures of ternary complexes, fluorescence polarization binding assays, phosphorylation-mediated inhibition assays with full-length CaMKK2","journal":"ACS chemical biology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — crystal structures of ternary complexes plus biochemical binding assays, single lab with multiple orthogonal methods","pmids":["33146997"],"is_preprint":false},{"year":2021,"finding":"CAMKK2 negatively regulates ferroptosis in melanoma by activating the AMPK-NRF2 pathway to suppress lipid peroxidation. CAMKK2 is activated during ferroptosis and its suppression increases ferroptosis inducer efficacy and anti-PD-1 immunotherapy response.","method":"CAMKK2 knockdown/overexpression, AMPK and NRF2 pathway analysis, lipid peroxidation assays, xenograft tumor models","journal":"The Journal of investigative dermatology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic manipulation with in vitro and in vivo readouts, single lab","pmids":["34242660"],"is_preprint":false},{"year":2023,"finding":"Cdo1 (cysteine dioxygenase type 1) tethers CaMKK2 to AMPK by physically interacting with both proteins, thereby activating AMPK signaling to promote fatty acid oxidation and mitochondrial biogenesis in hepatocytes. Hepatocyte-specific Cdo1 KO impairs exercise-induced AMPK activation and worsens NAFLD.","method":"Hepatocyte-specific KO and overexpression of Cdo1, co-immunoprecipitation demonstrating Cdo1-CaMKK2-AMPK complex, AMPK activity assays, exercise intervention mouse model","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — Co-IP of trimeric complex plus tissue-specific KO and OE with in vivo functional validation","pmids":["38110408"],"is_preprint":false},{"year":2020,"finding":"Tetrahydrobiopterin (BH4) directly binds CaMKK2 and activates downstream AMPK/CREB/PGC-1α signaling to rescue mitochondrial and cardiac dysfunction in diabetic cardiomyopathy. Proteomics identified oxidative phosphorylation as the BH4-targeted pathway via CaMKK2.","method":"Proteomics, direct BH4-CaMKK2 binding assay, AMPK phosphorylation assays, rodent diabetic cardiomyopathy models, mitochondrial function assays","journal":"Life science alliance","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct binding assay plus in vivo rodent model with mechanistic pathway analysis, single lab","pmids":["32699151"],"is_preprint":false},{"year":2021,"finding":"CAMKK2 regulates mitochondrial function in a cell-type-specific manner by controlling expression, post-translational modifications, and megacomplex assembly of succinate dehydrogenase (SDH) subunit B (SDHB); CAMKK2 deletion suppresses cellular respiration and shifts metabolism toward aerobic glycolysis (Warburg effect) in both HEK293 and HepG2 cells.","method":"CRISPR/Cas9 CAMKK2 KO, oxygen consumption rate measurements, SDH enzyme activity assays, SDHB knockdown/overexpression, mitochondrial supercomplex analysis, proteomics","journal":"Cell communication and signaling","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic KO with rescue by SDHB manipulation, multiple orthogonal metabolic readouts, single lab","pmids":["34563205"],"is_preprint":false},{"year":2016,"finding":"Wnt5a activates the CaMKK-CaMKIα cascade to specifically promote axonal (but not dendritic) outgrowth during neuronal polarization. Pharmacological and genetic inhibition of CaMKK-CaMKIα abolishes Wnt5a-induced axonal elongation; rescue of CaMKIα in CaMKIα-knockdown neurons restores Wnt5a-mediated axon outgrowth.","method":"Ca²⁺ imaging in cortical slices, pharmacological CaMKK inhibition, CaMKIα genetic knockdown and rescue, neuronal morphology analysis","journal":"Molecular brain","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Ca²⁺ imaging plus genetic rescue experiment, single lab","pmids":["26772170"],"is_preprint":false},{"year":2023,"finding":"CaMKK2 is not involved in contraction-stimulated AMPK activation or glucose uptake in adult murine skeletal muscle: a selective CaMKK2 inhibitor (SGC-CAMKK2-1) and CaMKK2 KO mice show no impairment in contraction-stimulated AMPK phosphorylation or glucose uptake. CaMKK2 protein is undetectable in adult murine skeletal muscle by immunoblot or mass spectrometry.","method":"SGC-CAMKK2-1 selective inhibitor, CaMKK2 KO mice, ex vivo contraction assays, AMPK activity assays, proteomics, mass spectrometry","journal":"Molecular metabolism","confidence":"High","confidence_rationale":"Tier 2 / Strong — highly selective inhibitor plus genetic KO with rigorous proteomic negative result, directly contradicts earlier STO-609 findings","pmids":["37380024"],"is_preprint":false},{"year":2015,"finding":"Using STO-609-resistant CaMKK isoform mutants in living cells, CaMKKβ (CAMKK2) was established as the isoform responsible for ionomycin-induced AMPK phosphorylation at Thr172, whereas both CaMKKα and CaMKKβ are capable of phosphorylating and activating CaMKIV at Thr196.","method":"STO-609-resistant CaMKK mutant cell lines (Ala328Thr/Val269Phe for CaMKKβ), ionomycin stimulation, AMPK and CaMKIV phosphorylation assays in living cells","journal":"Biochemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — isoform-selective drug-resistant mutants provide clean genetic epistasis in living cells","pmids":["26050738"],"is_preprint":false},{"year":2009,"finding":"Exendin-4 stimulates glucokinase gene transcription in pancreatic β-cells via the CaMKK/CaMKIV cascade: STO-609 (CaMKK inhibitor) abolishes exendin-4-induced GK promoter activity and GK protein upregulation; constitutively active CaMKIV enhances GK promoter activity.","method":"Reporter gene assay for GK promoter, STO-609 inhibition, CaMKIV phosphorylation assays, constitutively active CaMKIV expression, INS-1 cells","journal":"Diabetes, obesity & metabolism","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple complementary approaches in INS-1 cells, single lab","pmids":["19486109"],"is_preprint":false}],"current_model":"CaMKK2 is a Ca²⁺/calmodulin-activated serine/threonine kinase that functions as an upstream activator of AMPK, CaMKI, and CaMKIV, and directly phosphorylates Akt at Thr-308; it is activated by Ca²⁺/CaM binding (and sustained by Thr85 autophosphorylation for autonomous activity) and inactivated by PKA-mediated phosphorylation at Ser100/Ser495/Ser511 coupled with 14-3-3 protein sequestration; it forms physical complexes with AMPK (in a hypothalamic energy-sensing context), with Cav1.2/CaMK1a in caveolae (for excitation-transcription coupling in vascular myocytes), and with Cdo1-AMPK (in hepatocytes during exercise); it drives key cellular processes including hypothalamic appetite regulation (via AMPK-NPY/AgRP), Aβ-induced synaptic loss (via AMPK-Tau S262 and AMPK-MFF/ULK2-dependent mitochondrial remodeling), mechanosensitive actin stress fiber and peripheral actomyosin bundle assembly (via AMPK-VASP at focal adhesions), granulocyte lineage restriction, preadipocyte differentiation inhibition, hepatic gluconeogenesis control, and cancer cell metastasis (via a CaMKK2-PDE1A-PKG1-VASP actin-regulatory pathway); it is expressed in hypothalamus, brain, liver, myeloid cells, and various cancer cells, but CaMKK2 protein is absent or below detection in adult murine skeletal muscle."},"narrative":{"mechanistic_narrative":"CaMKK2 is a Ca²⁺/calmodulin-activated serine/threonine kinase that transduces intracellular Ca²⁺ signals into the activation of downstream kinases, principally AMPK and the CaMKI/CaMKIV cascade, thereby coupling Ca²⁺ flux to energy sensing, transcription, cytoskeletal dynamics, and cell-fate decisions across multiple tissues [PMID:18460329, PMID:26050738]. Isoform-selective drug-resistant mutants establish CaMKK2 as the kinase responsible for Ca²⁺-stimulated phosphorylation of AMPKα at Thr172, while it shares CaMKIV phosphorylation with CaMKKα [PMID:26050738]; it also directly phosphorylates Akt at Thr-308 in a Ca²⁺/CaM-dependent manner [PMID:28634229]. Activity is gated by autophosphorylation at Thr85, which confers autonomous Ca²⁺-independent activity as a form of molecular memory [PMID:26395653], and is switched off by PKA phosphorylation at Ser100/Ser495/Ser511 coupled to 14-3-3 recruitment that locks the kinase in a dephosphorylation-resistant inhibited state [PMID:32913128, PMID:29649512, PMID:33146997]. Through AMPK, CaMKK2 governs hypothalamic appetite control via NPY/AgRP [PMID:18460329], amino-acid- and genotoxic-stress-driven autophagy and cell-cycle arrest via ULK1 and nuclear AMPKα1 [PMID:23027865, PMID:29133590], hepatic gluconeogenesis [PMID:22240810], and adipogenic and granulocytic differentiation programs [PMID:21862616, PMID:21816924]. CaMKK2 localizes to focal adhesions and caveolar Cav1.2 complexes, where it drives AMPK–VASP-dependent actomyosin assembly and CaMK1a-mediated excitation–transcription coupling, respectively [PMID:29972773, PMID:35412911]. In disease, Aβ42-driven over-activation of the CaMKK2–AMPK dyad mediates synaptic loss through Tau-S262, MFF, and ULK2 phosphorylation [PMID:23583109, PMID:35915085], and CaMKK2 supports multiple cancers through AMPK-dependent and AMPK-independent (lipogenic, PDE1A–PKG1–VASP) routes [PMID:30242113, PMID:37335130], including immunosuppressive functions in intratumoral myeloid cells [PMID:31164648]. Notably, CaMKK2 protein is undetectable in adult murine skeletal muscle and is dispensable for contraction-stimulated AMPK activation there [PMID:37380024].","teleology":[{"year":2008,"claim":"Established CaMKK2 as the physiological upstream AMPK kinase in hypothalamic energy-sensing neurons, defining its role in appetite regulation.","evidence":"CaMKK2 knockout mice with pharmacological inhibition and co-IP of an AMPK signaling complex, with NPY/AgRP readouts","pmids":["18460329"],"confidence":"High","gaps":["Did not define the molecular architecture of the CaMKK2-AMPK complex","Upstream Ca²⁺ sources in these neurons not resolved"]},{"year":2009,"claim":"Demonstrated that CaMKK2 acts through CaMKIV to drive CREB-dependent BDNF transcription, linking the kinase to developmental transcriptional programs.","evidence":"CaMKK2 and CaMKIV null mice with BDNF rescue of cerebellar granule cell migration and pCREB immunostaining","pmids":["19605628"],"confidence":"High","gaps":["Direct CaMKIV substrate phosphorylation by CaMKK2 not biochemically isolated here","Ca²⁺ trigger upstream not defined"]},{"year":2011,"claim":"Defined CaMKK2 as a cell-intrinsic, kinase-activity-dependent brake on granulocyte and adipocyte differentiation via AMPK, extending its role to lineage commitment.","evidence":"Camkk2-/- mice, BMT rescue, kinase-dead epistasis in 32D cells, and AMPK-rescue in preadipocytes","pmids":["21816924","21862616"],"confidence":"High","gaps":["Ca²⁺ signals controlling lineage-specific CaMKK2 activation unknown","Direct AMPK substrates in differentiation not identified"]},{"year":2012,"claim":"Showed CaMKK2 controls hepatic gluconeogenesis and links androgen-receptor signaling to a feed-forward proliferative loop in prostate cancer, broadening its metabolic and oncogenic reach.","evidence":"Liver-specific Cre-lox deletion with glucose-production assays; siRNA and DHT stimulation in LNCaP cells with AR reporter and cell-cycle analysis","pmids":["22240810","22654108"],"confidence":"High","gaps":["HDAC5 phosphorylation link to PGC-1α stated as mechanism 'may involve'","Direct kinase substrates in AR loop not defined"]},{"year":2012,"claim":"Placed CaMKK2-β upstream of AMPK and mTORC1 in amino-acid-starvation autophagy, connecting Ca²⁺ to ULK1-Ser555 phosphorylation.","evidence":"siRNA, STO-609, Ca²⁺ chelation, and ULK1 phosphorylation assays","pmids":["23027865"],"confidence":"High","gaps":["Source distinction between extracellular and store Ca²⁺ not fully resolved","Mechanism of mTORC1 inactivation not detailed"]},{"year":2013,"claim":"Connected CaMKK2-AMPK to Alzheimer's pathology by showing Ca²⁺-driven, CaMKK2-dependent AMPK phosphorylation of Tau-S262 mediates Aβ-induced spine loss.","evidence":"Neuronal knockdown/overexpression, pharmacological inhibition, APP transgenic mouse, Tau S262A rescue and spine counting","pmids":["23583109"],"confidence":"High","gaps":["Whether Tau S262 is a direct AMPK substrate in vivo not isolated biochemically","Reversibility of synaptic loss not addressed"]},{"year":2015,"claim":"Defined the activity-state machinery of CaMKK2: Thr85 autophosphorylation generates autonomous activity (molecular memory), with a disease-linked T85S mutation and behavioral phenotypes in null mice.","evidence":"In vitro autophosphorylation, T85S mutagenesis, lithium rescue, and behavioral assays in CaMKK2 null mice","pmids":["26395653"],"confidence":"High","gaps":["Human disease causality of T85S not established by genetics","Structural basis of autonomous activity not solved"]},{"year":2015,"claim":"Established CaMKK2 as a scaffold coupling CaMKIV to mTOR/S6K for protein synthesis in liver cancer, and confirmed kinase-activity dependence.","evidence":"RNAi, kinase-inactive mutant rescue, STO-609, and in vivo tumor models","pmids":["25847065"],"confidence":"High","gaps":["Direct interaction surfaces of the scaffold not mapped","Distinction between scaffold and catalytic contributions incomplete"]},{"year":2016,"claim":"Resolved that elevated Ca²⁺ engages CaMKK2-AMPK to enforce G1 arrest in LKB1-null tumors, positioning CaMKK2 as an alternative AMPK-activating axis.","evidence":"LKB1-null cells, constitutively active CaMKK2, dominant-negative AMPK, CRISPR AMPKα double KO, cell-cycle analysis","pmids":["27141100"],"confidence":"High","gaps":["Source of Ca²⁺ elevation in LKB1-null cells unresolved","Did not assess Akt or CaMKIV branches"]},{"year":2017,"claim":"Showed CaMKK2 directly phosphorylates Akt at Thr-308, revealing a substrate beyond the canonical AMPK/CaMK cascade.","evidence":"In vitro kinase assay with recombinant CaMKK2 and Akt plus cellular epistasis with PDK1 knockdown in ovarian cancer cells","pmids":["28634229"],"confidence":"High","gaps":["Single lab; reciprocal in vivo confirmation limited","Relative contribution versus PDK1 across cell types unknown"]},{"year":2017,"claim":"Identified metabolite-level control of CaMKK2, with GDH1-derived α-ketoglutarate enhancing CaMKK2-AMPK binding to confer anoikis resistance.","evidence":"Reciprocal Co-IP, RNAi, pharmacological inhibition, and patient-derived xenografts","pmids":["29249655"],"confidence":"Medium","gaps":["Single lab; structural basis of αKG-enhanced binding unknown","Direct binding of αKG to CaMKK2 not shown"]},{"year":2017,"claim":"Demonstrated nuclear-restricted CaMKK2-AMPKα1 activation by genotoxic stress, independent of ATM and LKB1, defining a compartmentalized DNA-damage survival pathway.","evidence":"STO-609, AMPKα double KO, subcellular fractionation, Ca²⁺ chelation, and viability assays","pmids":["29133590"],"confidence":"High","gaps":["Mechanism of nuclear Ca²⁺ generation unresolved","Nuclear AMPK substrates not enumerated"]},{"year":2018,"claim":"Defined the inhibitory regulatory mechanism: 14-3-3 binds the CaMKK2 kinase domain and N-terminal phospho-sites and slows dephosphorylation without blocking catalysis.","evidence":"Enzyme activity, SAXS, time-resolved fluorescence, phosphopeptide crystallography","pmids":["29649512"],"confidence":"High","gaps":["Full-length CaMKK2/14-3-3 complex structure not solved","Physiological kinase generating Thr145 phosphorylation not defined here"]},{"year":2018,"claim":"Localized CaMKK2 to focal adhesions and established its AMPK-VASP-dependent control of mechanosensitive contractile stress fiber assembly.","evidence":"Localization imaging, pharmacological inhibition of CaMKK2 and Ca²⁺ channels, VASP phosphorylation, traction force microscopy","pmids":["29972773"],"confidence":"High","gaps":["Mechanosensitive channel identity not specified","Whether VASP is a direct AMPK substrate not isolated"]},{"year":2018,"claim":"Revealed an AMPK-independent oncogenic function: CaMKK2 promotes lipogenesis (ACC/FASN) post-transcriptionally, opposite to AMPK's lipogenesis-suppressing role in prostate cancer.","evidence":"Camkk2 and AMPKβ1 deletion in Pten-null prostate cancer model with lipogenesis and protein expression analysis","pmids":["30242113"],"confidence":"High","gaps":["Molecular mechanism of post-transcriptional ACC/FASN control undefined","Direct CaMKK2 effector in this pathway unidentified"]},{"year":2019,"claim":"Extended CaMKK2 function to the tumor microenvironment, showing macrophage CaMKK2 drives immunosuppression and limits CD8+ T cell recruitment.","evidence":"Conditional Camkk2-/- mice, BMT, macrophage-T cell co-culture, pharmacological inhibition, flow cytometry","pmids":["31164648"],"confidence":"High","gaps":["Downstream kinase effectors in macrophages not defined","Chemokine regulation mechanism not resolved"]},{"year":2020,"claim":"Solved the PKA-driven OFF-switch: phosphorylation at Ser495 impairs Ca²⁺/CaM activation while Ser100/Ser511 recruit 14-3-3 to lock CaMKK2 inactive, with a cooperative-binding crystal structure.","evidence":"In vitro kinase assays, mutagenesis, 14-3-3ζ/CaMKK2 peptide crystallography, cellular PKA stimulation","pmids":["32913128"],"confidence":"High","gaps":["Phosphatase counteracting these sites not identified","In vivo physiological triggers of PKA inactivation not mapped"]},{"year":2020,"claim":"Demonstrated pharmacological stabilization of the 14-3-3/CaMKK2 inhibited state by fusicoccanes, validating 14-3-3 as a tunable regulatory interface.","evidence":"Ternary complex crystal structures, fluorescence polarization, and phosphorylation-mediated inhibition assays with full-length CaMKK2","pmids":["33146997"],"confidence":"High","gaps":["Cellular and in vivo efficacy of fusicoccanes on CaMKK2 not shown","Selectivity across 14-3-3 client kinases not addressed"]},{"year":2020,"claim":"Broadened CaMKK2 outputs to membrane trafficking and metabolite/cofactor sensing, including CaMK4-dependent transferrin/iron handling and direct BH4 binding driving AMPK/CREB/PGC-1α.","evidence":"CRISPR KO HEK293 cells and CAMK4-/- mice for transferrin trafficking; direct BH4 binding assay and diabetic cardiomyopathy models","pmids":["32460794","32699151"],"confidence":"Medium","gaps":["Single-lab studies","Direct CaMKK2 substrate in transferrin trafficking not defined","BH4 binding site on CaMKK2 not mapped"]},{"year":2021,"claim":"Established additional cancer-promoting axes for CaMKK2: AR-driven AMPK-ULK1 autophagy, AMPK-NRF2 ferroptosis suppression, and CAF macropinocytosis, plus a COPI/Gemin4 endomembrane link.","evidence":"Genetic/pharmacological CAMKK2 disruption in CRPC and melanoma models, CAF macropinocytosis assays, and proteomic identification of Gemin4/COPI interaction","pmids":["33531625","34242660","33653692","34725334"],"confidence":"Medium","gaps":["COPI mechanistic link to CaMKK2 inferred rather than direct","Some readouts single-lab","Direct substrates in these pathways unidentified"]},{"year":2022,"claim":"Resolved compartmentalized Ca²⁺-to-transcription coupling: a caveolar Cav1.2/CaMKK2/CaMK1a complex drives CREB-dependent vascular remodeling genes.","evidence":"Live Ca²⁺ imaging, reciprocal Co-IP, caveolin1-KO mice, STO-609, and mesenteric artery pressure model","pmids":["35412911"],"confidence":"High","gaps":["Stoichiometry and assembly determinants of the complex unknown","Generalizability beyond vascular myocytes unaddressed"]},{"year":2022,"claim":"Mechanistically detailed Aβ-driven synaptotoxicity, with CaMKK2-AMPK over-activation coordinating MFF-dependent mitochondrial fission and ULK2-dependent mitophagy.","evidence":"Transgenic AD mice, human APP knockin ES-derived neurons, AMPK subunit KO, and MFF/ULK2 phosphorylation assays","pmids":["35915085"],"confidence":"High","gaps":["Direct phosphorylation of MFF/ULK2 by AMPK in this context not isolated biochemically","Therapeutic reversibility not tested"]},{"year":2023,"claim":"Defined a non-canonical actin-regulatory metastasis pathway, CaMKK2-PDE1A-PKG1-VASP, distinct from the AMPK-VASP axis.","evidence":"Genetic/pharmacological CaMKK2 disruption, PDE1A and cGMP/PKG1 assays, VASP phosphorylation, and TNBC/HGSOC xenograft metastasis models","pmids":["37335130"],"confidence":"High","gaps":["Mechanism by which CaMKK2 raises PDE1A expression unknown","Relationship to the AMPK-VASP focal adhesion pathway not reconciled"]},{"year":2023,"claim":"Identified Cdo1 as a physical tether assembling CaMKK2 with AMPK in hepatocytes to drive exercise-responsive fatty-acid oxidation and mitochondrial biogenesis.","evidence":"Hepatocyte-specific Cdo1 KO/OE, Co-IP of Cdo1-CaMKK2-AMPK complex, and exercise mouse model","pmids":["38110408"],"confidence":"High","gaps":["Structural basis of the trimeric tether unknown","Generality across other tissues unaddressed"]},{"year":2023,"claim":"Corrected the tissue scope of CaMKK2 by showing it is absent and functionally dispensable in adult murine skeletal muscle, refuting earlier inhibitor-based claims.","evidence":"Selective inhibitor SGC-CAMKK2-1, CaMKK2 KO mice, ex vivo contraction assays, and proteomic/mass-spec negative detection","pmids":["37380024"],"confidence":"High","gaps":["Does not resolve which kinase mediates contraction-stimulated AMPK activation in muscle","Species/developmental-stage generalization untested"]},{"year":null,"claim":"How CaMKK2 substrate choice (AMPK vs CaMKI/IV vs Akt) and scaffold-versus-catalytic functions are selected in a given cell, and how diverse Ca²⁺/metabolite inputs are integrated at the kinase, remain unresolved.","evidence":"","pmids":[],"confidence":"Low","gaps":["No unified structural model coupling activation inputs to substrate selection","Tissue-specific determinants of AMPK-dependent versus AMPK-independent outputs undefined","Direct in vivo substrate repertoire incompletely mapped"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[0,4,36,10]},{"term_id":"GO:0016740","term_label":"transferase 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Cycle","supporting_discovery_ids":[12,13,18]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[0,14,4]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[9,14,18]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[7,21]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[1,6,24,26]}],"complexes":["Cav1.2/CaMKK2/CaMK1a caveolar complex","Cdo1-CaMKK2-AMPK complex","CaMKK2-AMPK signaling complex"],"partners":["PRKAA1","PRKAA2","AKT1","CAMK4","YWHAZ","YWHAG","CACNA1C","CDO1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q96RR4","full_name":"Calcium/calmodulin-dependent protein kinase kinase 2","aliases":["Calcium/calmodulin-dependent protein kinase kinase beta","CaM-KK beta","CaM-kinase kinase beta","CaMKK beta"],"length_aa":588,"mass_kda":64.7,"function":"Calcium/calmodulin-dependent protein kinase belonging to a proposed calcium-triggered signaling cascade involved in a number of cellular processes. Isoform 1, isoform 2 and isoform 3 phosphorylate CAMK1 and CAMK4. Isoform 3 phosphorylates CAMK1D. Isoform 4, isoform 5 and isoform 6 lacking part of the calmodulin-binding domain are inactive. Efficiently phosphorylates 5'-AMP-activated protein kinase (AMPK) trimer, including that consisting of PRKAA1, PRKAB1 and PRKAG1. This phosphorylation is stimulated in response to Ca(2+) signals (By similarity). Seems to be involved in hippocampal activation of CREB1 (By similarity). May play a role in neurite growth. Isoform 3 may promote neurite elongation, while isoform 1 may promoter neurite branching","subcellular_location":"Nucleus; Cytoplasm; Cell projection, neuron projection","url":"https://www.uniprot.org/uniprotkb/Q96RR4/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/CAMKK2","classification":"Not Classified","n_dependent_lines":53,"n_total_lines":1208,"dependency_fraction":0.043874172185430466},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"CALM1","stoichiometry":0.2},{"gene":"CALM2","stoichiometry":0.2},{"gene":"CALM3","stoichiometry":0.2},{"gene":"FKBP5","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/CAMKK2","total_profiled":1310},"omim":[{"mim_id":"615002","title":"CALCIUM/CALMODULIN-DEPENDENT PROTEIN KINASE KINASE 2, BETA; CAMKK2","url":"https://www.omim.org/entry/615002"},{"mim_id":"607945","title":"ADIPONECTIN RECEPTOR 1; ADIPOR1","url":"https://www.omim.org/entry/607945"},{"mim_id":"605441","title":"ADIPOCYTE-, C1q-, AND COLLAGEN DOMAIN-CONTAINING; ADIPOQ","url":"https://www.omim.org/entry/605441"},{"mim_id":"602739","title":"PROTEIN KINASE, AMP-ACTIVATED, CATALYTIC, ALPHA-1; PRKAA1","url":"https://www.omim.org/entry/602739"},{"mim_id":"602216","title":"SERINE/THREONINE PROTEIN KINASE 11; STK11","url":"https://www.omim.org/entry/602216"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Cytosol","reliability":"Supported"}],"tissue_specificity":"Tissue enriched","tissue_distribution":"Detected in all","driving_tissues":[{"tissue":"brain","ntpm":324.0}],"url":"https://www.proteinatlas.org/search/CAMKK2"},"hgnc":{"alias_symbol":["CAMKK","KIAA0787","CAMKKB","MGC15254"],"prev_symbol":[]},"alphafold":{"accession":"Q96RR4","domains":[{"cath_id":"3.30.200.20","chopping":"143-205_227-269","consensus_level":"medium","plddt":85.8723,"start":143,"end":269},{"cath_id":"1.10.510.10","chopping":"271-467","consensus_level":"medium","plddt":93.9815,"start":271,"end":467}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q96RR4","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q96RR4-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q96RR4-F1-predicted_aligned_error_v6.png","plddt_mean":66.81},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=CAMKK2","jax_strain_url":"https://www.jax.org/strain/search?query=CAMKK2"},"sequence":{"accession":"Q96RR4","fasta_url":"https://rest.uniprot.org/uniprotkb/Q96RR4.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q96RR4/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q96RR4"}},"corpus_meta":[{"pmid":"18460329","id":"PMC_18460329","title":"Hypothalamic CaMKK2 contributes to the regulation of energy balance.","date":"2008","source":"Cell metabolism","url":"https://pubmed.ncbi.nlm.nih.gov/18460329","citation_count":314,"is_preprint":false},{"pmid":"23583109","id":"PMC_23583109","title":"The CAMKK2-AMPK kinase pathway mediates the synaptotoxic effects of Aβ oligomers through Tau phosphorylation.","date":"2013","source":"Neuron","url":"https://pubmed.ncbi.nlm.nih.gov/23583109","citation_count":299,"is_preprint":false},{"pmid":"29249655","id":"PMC_29249655","title":"The PLAG1-GDH1 Axis Promotes Anoikis Resistance and Tumor Metastasis through CamKK2-AMPK Signaling in LKB1-Deficient Lung Cancer.","date":"2017","source":"Molecular cell","url":"https://pubmed.ncbi.nlm.nih.gov/29249655","citation_count":269,"is_preprint":false},{"pmid":"27449752","id":"PMC_27449752","title":"The Ca(2+)/Calmodulin/CaMKK2 Axis: Nature's Metabolic CaMshaft.","date":"2016","source":"Trends in endocrinology and metabolism: TEM","url":"https://pubmed.ncbi.nlm.nih.gov/27449752","citation_count":179,"is_preprint":false},{"pmid":"17213473","id":"PMC_17213473","title":"Possible CaMKK-dependent regulation of AMPK phosphorylation and glucose uptake at the onset of mild tetanic skeletal muscle contraction.","date":"2007","source":"American journal of physiology. 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Acute pharmacological inhibition of CaMKK2 in wild-type but not CaMKK2 null mice inhibits appetite and reduces NPY/AgRP mRNAs, establishing CaMKK2 as an upstream activator of AMPK in hypothalamic energy-sensing neurons.\",\n      \"method\": \"CaMKK2 knockout mice, pharmacological inhibition (STO-609), co-immunoprecipitation of signaling complex, NPY/AgRP mRNA measurement\",\n      \"journal\": \"Cell metabolism\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic KO plus pharmacological inhibition with specific rescue, replicated across multiple readouts in a high-impact study\",\n      \"pmids\": [\"18460329\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"NMDA receptor activation or membrane depolarization raises intracellular Ca²⁺, which activates AMPK in a CAMKK2-dependent manner in cortical/hippocampal neurons. AMPK then phosphorylates Tau on the KxGS motif S262, and Aβ42 oligomer-induced dendritic spine loss is blocked by inhibiting CAMKK2 or AMPK, or by expressing Tau S262A.\",\n      \"method\": \"Neuronal knockdown/overexpression of CAMKK2 and AMPK, pharmacological inhibition, in vivo APP transgenic mouse model, dendritic spine counting\",\n      \"journal\": \"Neuron\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal genetic and pharmacological approaches in vitro and in vivo, replicated in transgenic AD model\",\n      \"pmids\": [\"23583109\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"GDH1-derived α-ketoglutarate activates CaMKK2 by enhancing its binding to the substrate AMPK, placing CaMKK2 downstream of GDH1 and upstream of AMPK in LKB1-deficient lung cancer cells to provide anoikis resistance.\",\n      \"method\": \"Co-immunoprecipitation, RNAi knockdown, pharmacological inhibition, patient-derived xenograft models\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP and genetic KD with functional rescue, single lab\",\n      \"pmids\": [\"29249655\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"CaMKK2 signals through CaMKIV to control liver cancer cell growth, and serves as a scaffold to assemble CaMKIV with components of the mTOR/S6K pathway, stimulating protein synthesis. Kinase-inactive CaMKK2 mutants fail to rescue growth defects from CaMKK2 loss, demonstrating kinase-activity dependence.\",\n      \"method\": \"RNAi knockdown, ectopic expression of wild-type vs. kinase-inactive mutants, in vivo tumor models, STO-609 pharmacological inhibition\",\n      \"journal\": \"Hepatology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — kinase-dead mutant rescue experiments plus in vivo tumor models, multiple orthogonal approaches\",\n      \"pmids\": [\"25847065\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"CaMKK2 directly phosphorylates Akt at Thr-308 in a Ca²⁺/CaM-dependent manner, as shown by in vitro reconstitution with recombinant CaMKK2 and recombinant Akt. In ovarian cancer cells, CaMKK2 knockdown or inhibition reduces Akt phosphorylation at Thr-308 and Ser-473 additively with PDK1 knockdown.\",\n      \"method\": \"In vitro kinase assay with recombinant proteins, siRNA knockdown, pharmacological inhibition, intracellular Ca²⁺ chelation\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution with recombinant proteins plus cellular epistasis, single lab but multiple orthogonal methods\",\n      \"pmids\": [\"28634229\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Essential amino acid withdrawal raises cytosolic Ca²⁺ from extracellular medium and intracellular stores, activating AMPK via CaMKK-β, which then phosphorylates ULK1 at Ser-555 to initiate autophagy. CaMKK-β is also required for mTORC1 inactivation under amino acid starvation.\",\n      \"method\": \"siRNA knockdown of CaMKK-β and AMPK, pharmacological inhibition (STO-609), Ca²⁺ chelation, ULK1 phosphorylation assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic KD and pharmacological inhibition with multiple downstream readouts, pathway epistasis established\",\n      \"pmids\": [\"23027865\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Aβ42 oligomer-driven over-activation of the CAMKK2-AMPK kinase dyad mediates synaptic loss through coordinated phosphorylation of MFF (driving mitochondrial fission) and ULK2 (driving mitophagy). Spatially restricted structural remodeling of dendritic mitochondria in CA1 apical tufts was CAMKK2-AMPK-dependent.\",\n      \"method\": \"Transgenic AD mouse model, human APP knockin ES cell-derived neurons, genetic KO of AMPK subunits, phosphorylation assays for MFF and ULK2\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple genetic models, human ES-derived neurons, and in vivo mouse model with mechanistic phosphorylation readouts\",\n      \"pmids\": [\"35915085\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"CaMKK2 is highly expressed in intratumoral myeloid cells in breast cancer. CaMKK2 deletion in macrophages reduces their ability to suppress T cell proliferation and increases chemokine expression that recruits effector CD8+ T cells; CaMKK2 inhibition blocks tumor growth in a CD8+ T cell-dependent manner.\",\n      \"method\": \"Conditional Camkk2-/- mice, BMT, in vitro macrophage-T cell co-culture suppression assays, pharmacological inhibition, flow cytometry\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic KO with functional cellular assays and in vivo tumor models, multiple orthogonal methods\",\n      \"pmids\": [\"31164648\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"CaMKK2 and AMPK promote macropinocytosis in pancreatic cancer-associated fibroblasts downstream of cytosolic Ca²⁺ elevation and in cooperation with ARHGEF2; macropinocytosis supports CAF fitness and provides secreted amino acids that promote tumor cell survival.\",\n      \"method\": \"Genetic knockdown of CaMKK2 and ARHGEF2, pharmacological inhibition, Ca²⁺ measurements, macropinocytosis assays, in vivo PDAC tumor models\",\n      \"journal\": \"Cancer discovery\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic KD plus pharmacological inhibition plus in vivo models with mechanistic pathway dissection\",\n      \"pmids\": [\"33653692\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"CaMKK2 and CaMKIV are required for CREB phosphorylation in cerebellar granule cells, which drives Bdnf transcription necessary for granule cell migration from the external to internal granule cell layer. Re-expression of CaMKK2 in null neurons restores pCREB and BDNF, and exogenous BDNF rescues migration defects in vitro.\",\n      \"method\": \"CaMKK2 null and CaMKIV null mice, in vivo/in vitro cerebellar development assays, rescue by BDNF addition, pCREB immunostaining\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic KO with in vivo and in vitro rescue experiments, multiple orthogonal endpoints\",\n      \"pmids\": [\"19605628\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"PKA signaling inactivates CaMKK2 by phosphorylating three conserved serine residues: Ser495 directly impairs Ca²⁺-calmodulin activation; Ser100 and Ser511 mediate recruitment of 14-3-3 adaptor proteins that maintain CaMKK2 in the inactivated state by preventing dephosphorylation of phospho-Ser495. Crystal structure of 14-3-3ζ bound to a diphosphorylated CaMKK2 peptide reveals cooperative binding at canonical (Ser511) and noncanonical (Ser100) sites.\",\n      \"method\": \"In vitro kinase assays, site-directed mutagenesis, protein crystallography (crystal structure of 14-3-3ζ/CaMKK2 peptide complex), cellular PKA stimulation\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure plus mutagenesis plus in vitro kinase assays, multiple orthogonal methods in one study\",\n      \"pmids\": [\"32913128\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"14-3-3γ directly interacts with the kinase domain of CaMKK2 and the region containing the inhibitory phosphorylation site Thr145 in the N-terminal extension. 14-3-3 binding does not inhibit catalytic activity of phosphorylated CaMKK2 but slows its dephosphorylation. Crystal structures of phosphopeptides containing CaMKK2 14-3-3 binding motifs bound to 14-3-3 were determined.\",\n      \"method\": \"Enzyme activity measurements, SAXS, time-resolved fluorescence spectroscopy, protein crystallography, phosphopeptide binding assays\",\n      \"journal\": \"Biochimica et biophysica acta. General subjects\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — crystal structure plus SAXS plus kinase activity assays, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"29649512\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"In LKB1-null tumor cells, elevated intracellular Ca²⁺ activates CAMKK2, which phosphorylates AMPK-α at Thr172 causing G1 cell-cycle arrest. Expression of a truncated, Ca²⁺/calmodulin-independent CAMKK2 mutant phenocopies LKB1 re-expression. Dominant-negative AMPK or double AMPK-α KO prevents Ca²⁺-induced G1 arrest, placing CAMKK2 upstream of AMPK in this pathway.\",\n      \"method\": \"LKB1-null cell lines, constitutively active CAMKK2 expression, dominant-negative AMPK, CRISPR double KO of AMPK-α1/α2, Ca²⁺ ionophore treatment, cell-cycle analysis\",\n      \"journal\": \"Molecular cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — epistasis established by genetic rescue and KO with multiple cell lines and orthogonal genetic tools\",\n      \"pmids\": [\"27141100\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Genotoxic stress (etoposide) activates the AMPK-α1 isoform specifically within the nucleus via nuclear Ca²⁺ increase and CaMKK2; activation is independent of ATM and LKB1. Nuclear AMPK-α1 activation promotes G1 arrest and enhances cell survival after etoposide, effects abolished by AMPK-α1/α2 double KO.\",\n      \"method\": \"Pharmacological inhibition (STO-609), AMPK-α1/α2 double KO, subcellular fractionation, Ca²⁺ chelation, cell-cycle analysis, viability assays\",\n      \"journal\": \"Molecular cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic KO plus pharmacological inhibition plus Ca²⁺ chelation with multiple orthogonal readouts\",\n      \"pmids\": [\"29133590\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"A molecular complex of Cav1.2/CaMKK2/CaMK1a forms within caveolae of vascular myocytes. Ca²⁺ influx through Cav1.2 directly activates CaMKK2; CaMKK2 then phosphorylates CaMK1a, which translocates to the nucleus to phosphorylate CREB, driving expression of genes involved in chemotaxis, leukocyte adhesion, and vascular remodeling. Disruption of caveolae or CaMKK2 inhibition abrogates these effects.\",\n      \"method\": \"Live Ca²⁺ imaging with genetically encoded indicators, co-immunoprecipitation of Cav1.2/CaMKK2/CaMK1a complex, caveolin1-KO mice, STO-609 pharmacological inhibition, mesenteric artery pressure loading model\",\n      \"journal\": \"PNAS\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP of protein complex, live imaging, genetic KO, and pharmacological inhibition with in vivo vascular model\",\n      \"pmids\": [\"35412911\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Thr85 is a CaMKK2 autophosphorylation site that generates autonomous (Ca²⁺-independent) activity, providing molecular memory of prior Ca²⁺ stimulation. The disease-linked T85S mutation fails to generate autonomous activity upon phosphorylation at Ser85, causing partial loss of CaMKK2 activity. Lithium (GSK3 inhibitor) rescues autonomous activity in the T85S mutant. CaMKK2 null mice display anxiety and manic-like behavioral disturbances.\",\n      \"method\": \"In vitro autophosphorylation assays, site-directed mutagenesis (T85S), autonomous activity measurements, GSK3 inhibition with lithium, behavioral assays in CaMKK2 null mice\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro kinase assays with mutagenesis plus in vivo behavioral phenotyping, multiple orthogonal methods\",\n      \"pmids\": [\"26395653\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"CaMKK2 localizes around focal adhesions at the ends of contractile stress fibers and is enriched at sites of mechanosensitive Ca²⁺ influx. CaMKK2 acts upstream of AMPK to phosphorylate VASP, inhibiting actin polymerization at focal adhesions and enabling contractile stress fiber maturation. Inhibition of CaMKK2 or mechanosensitive Ca²⁺ channels impairs AMPK and VASP phosphorylation and abolishes contractile bundles.\",\n      \"method\": \"Subcellular localization imaging, pharmacological inhibition of CaMKK2 and Ca²⁺ channels, AMPK and VASP phosphorylation assays, traction force microscopy\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct localization with functional consequence, pharmacological pathway dissection, and force measurements\",\n      \"pmids\": [\"29972773\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"CaMKK2/AMPK signaling is required for assembly and maintenance of peripheral actomyosin bundles at epithelial cell-cell contacts; these bundles arise from lateral fusion of transverse arc stress fibers. Inhibition of CaMKK2/AMPK disrupts tension-maintaining actomyosin bundles, redistributes cellular forces, and causes defects in monolayer integrity and epithelial identity.\",\n      \"method\": \"Pharmacological inhibition of CaMKK2 and AMPK, live-cell imaging of actin dynamics, traction force microscopy, monolayer integrity assays\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — mechanosensitive pathway dissection with live imaging and force measurements, multiple orthogonal readouts\",\n      \"pmids\": [\"32209483\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"In prostate cancer, the androgen receptor (AR) induces CaMKK2 mRNA/protein expression and causes nuclear translocation of CaMKK2. CaMKK2 in turn maintains AR transcriptional activity (PSA expression, AR response element-driven reporter), cyclin D1, and Rb hyperphosphorylation. Loss of CaMKK2 reduces cell proliferation and causes G1 arrest, establishing an AR-CaMKK2 feedback loop.\",\n      \"method\": \"siRNA knockdown of CaMKK2, dihydrotestosterone stimulation, androgen withdrawal, reporter assays, cell-cycle analysis, LNCaP cells\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal genetic and pharmacological approaches with well-defined molecular readouts in established PCa model\",\n      \"pmids\": [\"22654108\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"CaMKK2 is expressed in preadipocytes where it acts as an AMPKα kinase. Inhibition or deletion of CaMKK2 in preadipocytes accelerates adipogenic differentiation by reducing Pref-1 and Sox9 mRNA, releasing suppression of C/EBPβ and C/EBPδ. AMPK activation reverses the enhanced differentiation caused by CaMKK2 loss.\",\n      \"method\": \"CaMKK2 null preadipocytes, AICAR-mediated AMPK activation rescue, mRNA expression analysis, adipogenesis assays\",\n      \"journal\": \"Endocrinology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic KO with pharmacological rescue and multiple molecular readouts, epistasis established\",\n      \"pmids\": [\"21862616\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"CaMKK2 is expressed in liver and its liver-specific deletion lowers blood glucose and improves glucose tolerance. CaMKK2 KO hepatocytes produce less glucose, show decreased mRNA for PGC-1α and gluconeogenic enzymes (G6Pase, PEPCK), and fail to respond to catecholamine stimulation. The mechanism may involve diminished HDAC5 phosphorylation necessary for PGC-1α promoter derepression.\",\n      \"method\": \"Liver-specific Cre-lox CaMKK2 deletion, primary hepatocyte isolation, glucose production assays, qRT-PCR, adrenergic stimulation, HDAC5 phosphorylation\",\n      \"journal\": \"Molecular endocrinology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — tissue-specific conditional KO with multiple mechanistic readouts and metabolomic profiling\",\n      \"pmids\": [\"22240810\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"CaMKK2 functions as a cell-intrinsic inhibitor of granulocytic fate commitment in myeloid progenitors. CaMKK2 null bone marrow produces excess mature granulocytes; re-expression of CaMKK2 in null CMPs rescues aberrant granulopoiesis. Overexpression of CaMKK2 in 32D myeloblasts impedes G-CSF-induced granulocyte differentiation in a kinase-activity-dependent manner.\",\n      \"method\": \"Camkk2-/- mice, bone marrow transplantation, ectopic CaMKK2 expression (wild-type vs. kinase-dead), 32D differentiation assays, flow cytometry\",\n      \"journal\": \"Journal of leukocyte biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic KO with BMT rescue and kinase-dead mutant epistasis\",\n      \"pmids\": [\"21816924\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"PKA pathway promotes inclusion of CaMKK2 exon 16, generating two splice variants (with/without exon 16) that are differentially phosphorylated by PKA and have distinct effects on neuronal morphology: the +E16 variant promotes neurite branching while the -E16 variant promotes neurite elongation. CaMKKβ1 is required for forskolin-induced neurite growth.\",\n      \"method\": \"Alternative splicing reporter assays, PKA selective inhibitor H89, RNAi knockdown, overexpression in B35 neuroblastoma cells, neurite morphology analysis\",\n      \"journal\": \"RNA biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional reporter assays and RNAi with morphological readouts, single lab\",\n      \"pmids\": [\"21957496\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"CaMKK2 suppresses muscle regeneration by inhibiting myoblast proliferation and differentiation in an AMPK-dependent manner. CaMKK2 overexpression causes AMPK-mediated cell-cycle arrest (Cdc2-Tyr15 phosphorylation) and represses PGC-1α transcription to suppress differentiation; overexpression of CaMKK2 in mouse muscle by electroporation impairs freeze injury-induced regeneration.\",\n      \"method\": \"Overexpression and knockdown of CaMKK2 in C2C12 myoblasts, AMPK agonist/antagonist, in vivo electroporation of CaMKK2, freeze injury model\",\n      \"journal\": \"International journal of molecular sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — loss- and gain-of-function with in vivo validation, single lab\",\n      \"pmids\": [\"27783047\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"CAMKK2 promotes prostate cancer independently of AMPK via increased lipogenesis: CAMKK2 deletion reduces expression of ACC and FASN by a post-transcriptional mechanism (potentially decreased protein translation), while AMPK activation opposes this by inhibiting lipogenesis. CAMKK2 and AMPK thus have opposing effects on lipogenesis and prostate cancer progression.\",\n      \"method\": \"Genetic Camkk2 deletion in Pten-null mouse prostate cancer model, AMPKβ1 deletion, human PCa cell lines, lipogenesis assays, protein expression analysis\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo genetic model with opposing-gene epistasis and mechanistic lipogenic pathway analysis\",\n      \"pmids\": [\"30242113\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"AR-driven CaMKK2-AMPK-ULK1 signaling promotes autophagy in prostate cancer in an mTOR-independent manner. Inhibition of CAMKK2 disrupts autophagy and impairs tumor growth in multiple CRPC mouse models; AMPK-ULK1 inhibition also blocks autophagy and colony formation.\",\n      \"method\": \"Genetic and pharmacological disruption of CAMKK2, AMPK, and ULK1; autophagy flux assays; CRPC mouse models; patient tumor sample analysis\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple genetic/pharmacological approaches with in vivo validation and patient sample correlation\",\n      \"pmids\": [\"33531625\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"CaMKK2 mediates actin cytoskeletal dynamics to promote metastasis through a CaMKK2-PDE1A-PKG1-VASP pathway: CaMKK2 increases expression of phosphodiesterase PDE1A, which hydrolyzes cGMP to decrease PKG1 activity; reduced PKG1 activity decreases VASP phosphorylation, and hypophosphorylated VASP binds F-actin to promote cell movement.\",\n      \"method\": \"Genetic disruption and pharmacological inhibition of CaMKK2, PDE1A expression analysis, cGMP/PKG1 activity assays, VASP phosphorylation, murine xenograft metastasis models of TNBC and HGSOC\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — pathway dissection with multiple genetic and pharmacological tools plus in vivo xenograft models\",\n      \"pmids\": [\"37335130\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"CAMKK2-CAMK4 signaling regulates receptor-mediated transferrin trafficking and iron homeostasis. Loss of CAMK4 causes abnormal post-translational modifications and turnover of transferrin in cerebellum and liver. CAMKK2/CAMK4 deletion in HEK293 cells alters intracellular Ca²⁺ homeostasis and disrupts molecular interactions of transferrin with its receptor-associated protein complexes.\",\n      \"method\": \"CAMK4-/- mice, CRISPR/Cas9-deleted CAMKK2 and/or CAMK4 HEK293 cells, transferrin trafficking assays, Ca²⁺ measurements, protein interaction analysis\",\n      \"journal\": \"Cell communication and signaling\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic KO in vivo and in vitro with mechanistic trafficking assays, single lab\",\n      \"pmids\": [\"32460794\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"CaMKK2 knockdown leads to identification of Gemin4 as a direct interactor of CaMKK2 capable of also binding COPI subunits. CaMKK2 knockdown reduces δ-COP protein and causes Golgi expansion, ER stress, abortive autophagy, and impaired lysosomal acidification—phenotypes of COPI depletion—suggesting CaMKK2 sustains cell proliferation through effects on endomembrane trafficking.\",\n      \"method\": \"CAMKK2 knockdown, proteomics identification of interactors, co-immunoprecipitation with COPI subunits, imaging of Golgi and lysosomes, ER stress assays\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — Co-IP and knockdown with imaging phenotypes, multiple readouts but mechanistic link to COPI inferred\",\n      \"pmids\": [\"34725334\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Fusicoccin A and related fusicoccanes stabilize the interaction between 14-3-3γ and a diphosphorylated CaMKK2 peptide, enhancing binding affinity of full-length phosphorylated CaMKK2 to 14-3-3γ and slowing CaMKK2 dephosphorylation, thereby maintaining CaMKK2 in its phosphorylation-mediated inhibited state. Crystal structures of ternary 14-3-3/fusicoccane/CaMKK2-peptide complexes were determined.\",\n      \"method\": \"Crystal structures of ternary complexes, fluorescence polarization binding assays, phosphorylation-mediated inhibition assays with full-length CaMKK2\",\n      \"journal\": \"ACS chemical biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — crystal structures of ternary complexes plus biochemical binding assays, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"33146997\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"CAMKK2 negatively regulates ferroptosis in melanoma by activating the AMPK-NRF2 pathway to suppress lipid peroxidation. CAMKK2 is activated during ferroptosis and its suppression increases ferroptosis inducer efficacy and anti-PD-1 immunotherapy response.\",\n      \"method\": \"CAMKK2 knockdown/overexpression, AMPK and NRF2 pathway analysis, lipid peroxidation assays, xenograft tumor models\",\n      \"journal\": \"The Journal of investigative dermatology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic manipulation with in vitro and in vivo readouts, single lab\",\n      \"pmids\": [\"34242660\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Cdo1 (cysteine dioxygenase type 1) tethers CaMKK2 to AMPK by physically interacting with both proteins, thereby activating AMPK signaling to promote fatty acid oxidation and mitochondrial biogenesis in hepatocytes. Hepatocyte-specific Cdo1 KO impairs exercise-induced AMPK activation and worsens NAFLD.\",\n      \"method\": \"Hepatocyte-specific KO and overexpression of Cdo1, co-immunoprecipitation demonstrating Cdo1-CaMKK2-AMPK complex, AMPK activity assays, exercise intervention mouse model\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — Co-IP of trimeric complex plus tissue-specific KO and OE with in vivo functional validation\",\n      \"pmids\": [\"38110408\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Tetrahydrobiopterin (BH4) directly binds CaMKK2 and activates downstream AMPK/CREB/PGC-1α signaling to rescue mitochondrial and cardiac dysfunction in diabetic cardiomyopathy. Proteomics identified oxidative phosphorylation as the BH4-targeted pathway via CaMKK2.\",\n      \"method\": \"Proteomics, direct BH4-CaMKK2 binding assay, AMPK phosphorylation assays, rodent diabetic cardiomyopathy models, mitochondrial function assays\",\n      \"journal\": \"Life science alliance\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct binding assay plus in vivo rodent model with mechanistic pathway analysis, single lab\",\n      \"pmids\": [\"32699151\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"CAMKK2 regulates mitochondrial function in a cell-type-specific manner by controlling expression, post-translational modifications, and megacomplex assembly of succinate dehydrogenase (SDH) subunit B (SDHB); CAMKK2 deletion suppresses cellular respiration and shifts metabolism toward aerobic glycolysis (Warburg effect) in both HEK293 and HepG2 cells.\",\n      \"method\": \"CRISPR/Cas9 CAMKK2 KO, oxygen consumption rate measurements, SDH enzyme activity assays, SDHB knockdown/overexpression, mitochondrial supercomplex analysis, proteomics\",\n      \"journal\": \"Cell communication and signaling\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic KO with rescue by SDHB manipulation, multiple orthogonal metabolic readouts, single lab\",\n      \"pmids\": [\"34563205\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Wnt5a activates the CaMKK-CaMKIα cascade to specifically promote axonal (but not dendritic) outgrowth during neuronal polarization. Pharmacological and genetic inhibition of CaMKK-CaMKIα abolishes Wnt5a-induced axonal elongation; rescue of CaMKIα in CaMKIα-knockdown neurons restores Wnt5a-mediated axon outgrowth.\",\n      \"method\": \"Ca²⁺ imaging in cortical slices, pharmacological CaMKK inhibition, CaMKIα genetic knockdown and rescue, neuronal morphology analysis\",\n      \"journal\": \"Molecular brain\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Ca²⁺ imaging plus genetic rescue experiment, single lab\",\n      \"pmids\": [\"26772170\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"CaMKK2 is not involved in contraction-stimulated AMPK activation or glucose uptake in adult murine skeletal muscle: a selective CaMKK2 inhibitor (SGC-CAMKK2-1) and CaMKK2 KO mice show no impairment in contraction-stimulated AMPK phosphorylation or glucose uptake. CaMKK2 protein is undetectable in adult murine skeletal muscle by immunoblot or mass spectrometry.\",\n      \"method\": \"SGC-CAMKK2-1 selective inhibitor, CaMKK2 KO mice, ex vivo contraction assays, AMPK activity assays, proteomics, mass spectrometry\",\n      \"journal\": \"Molecular metabolism\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — highly selective inhibitor plus genetic KO with rigorous proteomic negative result, directly contradicts earlier STO-609 findings\",\n      \"pmids\": [\"37380024\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Using STO-609-resistant CaMKK isoform mutants in living cells, CaMKKβ (CAMKK2) was established as the isoform responsible for ionomycin-induced AMPK phosphorylation at Thr172, whereas both CaMKKα and CaMKKβ are capable of phosphorylating and activating CaMKIV at Thr196.\",\n      \"method\": \"STO-609-resistant CaMKK mutant cell lines (Ala328Thr/Val269Phe for CaMKKβ), ionomycin stimulation, AMPK and CaMKIV phosphorylation assays in living cells\",\n      \"journal\": \"Biochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — isoform-selective drug-resistant mutants provide clean genetic epistasis in living cells\",\n      \"pmids\": [\"26050738\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Exendin-4 stimulates glucokinase gene transcription in pancreatic β-cells via the CaMKK/CaMKIV cascade: STO-609 (CaMKK inhibitor) abolishes exendin-4-induced GK promoter activity and GK protein upregulation; constitutively active CaMKIV enhances GK promoter activity.\",\n      \"method\": \"Reporter gene assay for GK promoter, STO-609 inhibition, CaMKIV phosphorylation assays, constitutively active CaMKIV expression, INS-1 cells\",\n      \"journal\": \"Diabetes, obesity & metabolism\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple complementary approaches in INS-1 cells, single lab\",\n      \"pmids\": [\"19486109\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"CaMKK2 is a Ca²⁺/calmodulin-activated serine/threonine kinase that functions as an upstream activator of AMPK, CaMKI, and CaMKIV, and directly phosphorylates Akt at Thr-308; it is activated by Ca²⁺/CaM binding (and sustained by Thr85 autophosphorylation for autonomous activity) and inactivated by PKA-mediated phosphorylation at Ser100/Ser495/Ser511 coupled with 14-3-3 protein sequestration; it forms physical complexes with AMPK (in a hypothalamic energy-sensing context), with Cav1.2/CaMK1a in caveolae (for excitation-transcription coupling in vascular myocytes), and with Cdo1-AMPK (in hepatocytes during exercise); it drives key cellular processes including hypothalamic appetite regulation (via AMPK-NPY/AgRP), Aβ-induced synaptic loss (via AMPK-Tau S262 and AMPK-MFF/ULK2-dependent mitochondrial remodeling), mechanosensitive actin stress fiber and peripheral actomyosin bundle assembly (via AMPK-VASP at focal adhesions), granulocyte lineage restriction, preadipocyte differentiation inhibition, hepatic gluconeogenesis control, and cancer cell metastasis (via a CaMKK2-PDE1A-PKG1-VASP actin-regulatory pathway); it is expressed in hypothalamus, brain, liver, myeloid cells, and various cancer cells, but CaMKK2 protein is absent or below detection in adult murine skeletal muscle.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"CaMKK2 is a Ca²⁺/calmodulin-activated serine/threonine kinase that transduces intracellular Ca²⁺ signals into the activation of downstream kinases, principally AMPK and the CaMKI/CaMKIV cascade, thereby coupling Ca²⁺ flux to energy sensing, transcription, cytoskeletal dynamics, and cell-fate decisions across multiple tissues [#0, #36]. Isoform-selective drug-resistant mutants establish CaMKK2 as the kinase responsible for Ca²⁺-stimulated phosphorylation of AMPKα at Thr172, while it shares CaMKIV phosphorylation with CaMKKα [#36]; it also directly phosphorylates Akt at Thr-308 in a Ca²⁺/CaM-dependent manner [#4]. Activity is gated by autophosphorylation at Thr85, which confers autonomous Ca²⁺-independent activity as a form of molecular memory [#15], and is switched off by PKA phosphorylation at Ser100/Ser495/Ser511 coupled to 14-3-3 recruitment that locks the kinase in a dephosphorylation-resistant inhibited state [#10, #11, #29]. Through AMPK, CaMKK2 governs hypothalamic appetite control via NPY/AgRP [#0], amino-acid- and genotoxic-stress-driven autophagy and cell-cycle arrest via ULK1 and nuclear AMPKα1 [#5, #13], hepatic gluconeogenesis [#20], and adipogenic and granulocytic differentiation programs [#19, #21]. CaMKK2 localizes to focal adhesions and caveolar Cav1.2 complexes, where it drives AMPK–VASP-dependent actomyosin assembly and CaMK1a-mediated excitation–transcription coupling, respectively [#16, #14]. In disease, Aβ42-driven over-activation of the CaMKK2–AMPK dyad mediates synaptic loss through Tau-S262, MFF, and ULK2 phosphorylation [#1, #6], and CaMKK2 supports multiple cancers through AMPK-dependent and AMPK-independent (lipogenic, PDE1A–PKG1–VASP) routes [#24, #26], including immunosuppressive functions in intratumoral myeloid cells [#7]. Notably, CaMKK2 protein is undetectable in adult murine skeletal muscle and is dispensable for contraction-stimulated AMPK activation there [#35].\",\n  \"teleology\": [\n    {\n      \"year\": 2008,\n      \"claim\": \"Established CaMKK2 as the physiological upstream AMPK kinase in hypothalamic energy-sensing neurons, defining its role in appetite regulation.\",\n      \"evidence\": \"CaMKK2 knockout mice with pharmacological inhibition and co-IP of an AMPK signaling complex, with NPY/AgRP readouts\",\n      \"pmids\": [\"18460329\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not define the molecular architecture of the CaMKK2-AMPK complex\", \"Upstream Ca²⁺ sources in these neurons not resolved\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Demonstrated that CaMKK2 acts through CaMKIV to drive CREB-dependent BDNF transcription, linking the kinase to developmental transcriptional programs.\",\n      \"evidence\": \"CaMKK2 and CaMKIV null mice with BDNF rescue of cerebellar granule cell migration and pCREB immunostaining\",\n      \"pmids\": [\"19605628\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct CaMKIV substrate phosphorylation by CaMKK2 not biochemically isolated here\", \"Ca²⁺ trigger upstream not defined\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Defined CaMKK2 as a cell-intrinsic, kinase-activity-dependent brake on granulocyte and adipocyte differentiation via AMPK, extending its role to lineage commitment.\",\n      \"evidence\": \"Camkk2-/- mice, BMT rescue, kinase-dead epistasis in 32D cells, and AMPK-rescue in preadipocytes\",\n      \"pmids\": [\"21816924\", \"21862616\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Ca²⁺ signals controlling lineage-specific CaMKK2 activation unknown\", \"Direct AMPK substrates in differentiation not identified\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Showed CaMKK2 controls hepatic gluconeogenesis and links androgen-receptor signaling to a feed-forward proliferative loop in prostate cancer, broadening its metabolic and oncogenic reach.\",\n      \"evidence\": \"Liver-specific Cre-lox deletion with glucose-production assays; siRNA and DHT stimulation in LNCaP cells with AR reporter and cell-cycle analysis\",\n      \"pmids\": [\"22240810\", \"22654108\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"HDAC5 phosphorylation link to PGC-1α stated as mechanism 'may involve'\", \"Direct kinase substrates in AR loop not defined\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Placed CaMKK2-β upstream of AMPK and mTORC1 in amino-acid-starvation autophagy, connecting Ca²⁺ to ULK1-Ser555 phosphorylation.\",\n      \"evidence\": \"siRNA, STO-609, Ca²⁺ chelation, and ULK1 phosphorylation assays\",\n      \"pmids\": [\"23027865\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Source distinction between extracellular and store Ca²⁺ not fully resolved\", \"Mechanism of mTORC1 inactivation not detailed\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Connected CaMKK2-AMPK to Alzheimer's pathology by showing Ca²⁺-driven, CaMKK2-dependent AMPK phosphorylation of Tau-S262 mediates Aβ-induced spine loss.\",\n      \"evidence\": \"Neuronal knockdown/overexpression, pharmacological inhibition, APP transgenic mouse, Tau S262A rescue and spine counting\",\n      \"pmids\": [\"23583109\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether Tau S262 is a direct AMPK substrate in vivo not isolated biochemically\", \"Reversibility of synaptic loss not addressed\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Defined the activity-state machinery of CaMKK2: Thr85 autophosphorylation generates autonomous activity (molecular memory), with a disease-linked T85S mutation and behavioral phenotypes in null mice.\",\n      \"evidence\": \"In vitro autophosphorylation, T85S mutagenesis, lithium rescue, and behavioral assays in CaMKK2 null mice\",\n      \"pmids\": [\"26395653\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Human disease causality of T85S not established by genetics\", \"Structural basis of autonomous activity not solved\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Established CaMKK2 as a scaffold coupling CaMKIV to mTOR/S6K for protein synthesis in liver cancer, and confirmed kinase-activity dependence.\",\n      \"evidence\": \"RNAi, kinase-inactive mutant rescue, STO-609, and in vivo tumor models\",\n      \"pmids\": [\"25847065\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct interaction surfaces of the scaffold not mapped\", \"Distinction between scaffold and catalytic contributions incomplete\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Resolved that elevated Ca²⁺ engages CaMKK2-AMPK to enforce G1 arrest in LKB1-null tumors, positioning CaMKK2 as an alternative AMPK-activating axis.\",\n      \"evidence\": \"LKB1-null cells, constitutively active CaMKK2, dominant-negative AMPK, CRISPR AMPKα double KO, cell-cycle analysis\",\n      \"pmids\": [\"27141100\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Source of Ca²⁺ elevation in LKB1-null cells unresolved\", \"Did not assess Akt or CaMKIV branches\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Showed CaMKK2 directly phosphorylates Akt at Thr-308, revealing a substrate beyond the canonical AMPK/CaMK cascade.\",\n      \"evidence\": \"In vitro kinase assay with recombinant CaMKK2 and Akt plus cellular epistasis with PDK1 knockdown in ovarian cancer cells\",\n      \"pmids\": [\"28634229\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Single lab; reciprocal in vivo confirmation limited\", \"Relative contribution versus PDK1 across cell types unknown\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Identified metabolite-level control of CaMKK2, with GDH1-derived α-ketoglutarate enhancing CaMKK2-AMPK binding to confer anoikis resistance.\",\n      \"evidence\": \"Reciprocal Co-IP, RNAi, pharmacological inhibition, and patient-derived xenografts\",\n      \"pmids\": [\"29249655\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab; structural basis of αKG-enhanced binding unknown\", \"Direct binding of αKG to CaMKK2 not shown\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Demonstrated nuclear-restricted CaMKK2-AMPKα1 activation by genotoxic stress, independent of ATM and LKB1, defining a compartmentalized DNA-damage survival pathway.\",\n      \"evidence\": \"STO-609, AMPKα double KO, subcellular fractionation, Ca²⁺ chelation, and viability assays\",\n      \"pmids\": [\"29133590\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of nuclear Ca²⁺ generation unresolved\", \"Nuclear AMPK substrates not enumerated\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Defined the inhibitory regulatory mechanism: 14-3-3 binds the CaMKK2 kinase domain and N-terminal phospho-sites and slows dephosphorylation without blocking catalysis.\",\n      \"evidence\": \"Enzyme activity, SAXS, time-resolved fluorescence, phosphopeptide crystallography\",\n      \"pmids\": [\"29649512\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Full-length CaMKK2/14-3-3 complex structure not solved\", \"Physiological kinase generating Thr145 phosphorylation not defined here\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Localized CaMKK2 to focal adhesions and established its AMPK-VASP-dependent control of mechanosensitive contractile stress fiber assembly.\",\n      \"evidence\": \"Localization imaging, pharmacological inhibition of CaMKK2 and Ca²⁺ channels, VASP phosphorylation, traction force microscopy\",\n      \"pmids\": [\"29972773\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanosensitive channel identity not specified\", \"Whether VASP is a direct AMPK substrate not isolated\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Revealed an AMPK-independent oncogenic function: CaMKK2 promotes lipogenesis (ACC/FASN) post-transcriptionally, opposite to AMPK's lipogenesis-suppressing role in prostate cancer.\",\n      \"evidence\": \"Camkk2 and AMPKβ1 deletion in Pten-null prostate cancer model with lipogenesis and protein expression analysis\",\n      \"pmids\": [\"30242113\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular mechanism of post-transcriptional ACC/FASN control undefined\", \"Direct CaMKK2 effector in this pathway unidentified\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Extended CaMKK2 function to the tumor microenvironment, showing macrophage CaMKK2 drives immunosuppression and limits CD8+ T cell recruitment.\",\n      \"evidence\": \"Conditional Camkk2-/- mice, BMT, macrophage-T cell co-culture, pharmacological inhibition, flow cytometry\",\n      \"pmids\": [\"31164648\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Downstream kinase effectors in macrophages not defined\", \"Chemokine regulation mechanism not resolved\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Solved the PKA-driven OFF-switch: phosphorylation at Ser495 impairs Ca²⁺/CaM activation while Ser100/Ser511 recruit 14-3-3 to lock CaMKK2 inactive, with a cooperative-binding crystal structure.\",\n      \"evidence\": \"In vitro kinase assays, mutagenesis, 14-3-3ζ/CaMKK2 peptide crystallography, cellular PKA stimulation\",\n      \"pmids\": [\"32913128\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Phosphatase counteracting these sites not identified\", \"In vivo physiological triggers of PKA inactivation not mapped\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Demonstrated pharmacological stabilization of the 14-3-3/CaMKK2 inhibited state by fusicoccanes, validating 14-3-3 as a tunable regulatory interface.\",\n      \"evidence\": \"Ternary complex crystal structures, fluorescence polarization, and phosphorylation-mediated inhibition assays with full-length CaMKK2\",\n      \"pmids\": [\"33146997\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Cellular and in vivo efficacy of fusicoccanes on CaMKK2 not shown\", \"Selectivity across 14-3-3 client kinases not addressed\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Broadened CaMKK2 outputs to membrane trafficking and metabolite/cofactor sensing, including CaMK4-dependent transferrin/iron handling and direct BH4 binding driving AMPK/CREB/PGC-1α.\",\n      \"evidence\": \"CRISPR KO HEK293 cells and CAMK4-/- mice for transferrin trafficking; direct BH4 binding assay and diabetic cardiomyopathy models\",\n      \"pmids\": [\"32460794\", \"32699151\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab studies\", \"Direct CaMKK2 substrate in transferrin trafficking not defined\", \"BH4 binding site on CaMKK2 not mapped\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Established additional cancer-promoting axes for CaMKK2: AR-driven AMPK-ULK1 autophagy, AMPK-NRF2 ferroptosis suppression, and CAF macropinocytosis, plus a COPI/Gemin4 endomembrane link.\",\n      \"evidence\": \"Genetic/pharmacological CAMKK2 disruption in CRPC and melanoma models, CAF macropinocytosis assays, and proteomic identification of Gemin4/COPI interaction\",\n      \"pmids\": [\"33531625\", \"34242660\", \"33653692\", \"34725334\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"COPI mechanistic link to CaMKK2 inferred rather than direct\", \"Some readouts single-lab\", \"Direct substrates in these pathways unidentified\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Resolved compartmentalized Ca²⁺-to-transcription coupling: a caveolar Cav1.2/CaMKK2/CaMK1a complex drives CREB-dependent vascular remodeling genes.\",\n      \"evidence\": \"Live Ca²⁺ imaging, reciprocal Co-IP, caveolin1-KO mice, STO-609, and mesenteric artery pressure model\",\n      \"pmids\": [\"35412911\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Stoichiometry and assembly determinants of the complex unknown\", \"Generalizability beyond vascular myocytes unaddressed\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Mechanistically detailed Aβ-driven synaptotoxicity, with CaMKK2-AMPK over-activation coordinating MFF-dependent mitochondrial fission and ULK2-dependent mitophagy.\",\n      \"evidence\": \"Transgenic AD mice, human APP knockin ES-derived neurons, AMPK subunit KO, and MFF/ULK2 phosphorylation assays\",\n      \"pmids\": [\"35915085\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct phosphorylation of MFF/ULK2 by AMPK in this context not isolated biochemically\", \"Therapeutic reversibility not tested\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Defined a non-canonical actin-regulatory metastasis pathway, CaMKK2-PDE1A-PKG1-VASP, distinct from the AMPK-VASP axis.\",\n      \"evidence\": \"Genetic/pharmacological CaMKK2 disruption, PDE1A and cGMP/PKG1 assays, VASP phosphorylation, and TNBC/HGSOC xenograft metastasis models\",\n      \"pmids\": [\"37335130\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which CaMKK2 raises PDE1A expression unknown\", \"Relationship to the AMPK-VASP focal adhesion pathway not reconciled\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Identified Cdo1 as a physical tether assembling CaMKK2 with AMPK in hepatocytes to drive exercise-responsive fatty-acid oxidation and mitochondrial biogenesis.\",\n      \"evidence\": \"Hepatocyte-specific Cdo1 KO/OE, Co-IP of Cdo1-CaMKK2-AMPK complex, and exercise mouse model\",\n      \"pmids\": [\"38110408\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of the trimeric tether unknown\", \"Generality across other tissues unaddressed\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Corrected the tissue scope of CaMKK2 by showing it is absent and functionally dispensable in adult murine skeletal muscle, refuting earlier inhibitor-based claims.\",\n      \"evidence\": \"Selective inhibitor SGC-CAMKK2-1, CaMKK2 KO mice, ex vivo contraction assays, and proteomic/mass-spec negative detection\",\n      \"pmids\": [\"37380024\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Does not resolve which kinase mediates contraction-stimulated AMPK activation in muscle\", \"Species/developmental-stage generalization untested\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How CaMKK2 substrate choice (AMPK vs CaMKI/IV vs Akt) and scaffold-versus-catalytic functions are selected in a given cell, and how diverse Ca²⁺/metabolite inputs are integrated at the kinase, remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No unified structural model coupling activation inputs to substrate selection\", \"Tissue-specific determinants of AMPK-dependent versus AMPK-independent outputs undefined\", \"Direct in vivo substrate repertoire incompletely mapped\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [0, 4, 36, 10]},\n      {\"term_id\": \"GO:0016740\", \"supporting_discovery_ids\": [0, 4, 36]},\n      {\"term_id\": \"GO:0140657\", \"supporting_discovery_ids\": [4, 36]},\n      {\"term_id\": \"GO:0060089\", \"supporting_discovery_ids\": [14, 16, 0]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [15, 10]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [13, 16, 5]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [13, 18]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [14, 16]},\n      {\"term_id\": \"GO:0005815\", \"supporting_discovery_ids\": [16]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [0, 20, 24, 31]},\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [5, 25, 6]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [12, 13, 18]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 14, 4]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [9, 14, 18]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [7, 21]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [1, 6, 24, 26]}\n    ],\n    \"complexes\": [\n      \"Cav1.2/CaMKK2/CaMK1a caveolar complex\",\n      \"Cdo1-CaMKK2-AMPK complex\",\n      \"CaMKK2-AMPK signaling complex\"\n    ],\n    \"partners\": [\n      \"PRKAA1\",\n      \"PRKAA2\",\n      \"AKT1\",\n      \"CAMK4\",\n      \"YWHAZ\",\n      \"YWHAG\",\n      \"CACNA1C\",\n      \"CDO1\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}