{"gene":"ZDHHC17","run_date":"2026-06-11T09:02:06","timeline":{"discoveries":[{"year":2004,"finding":"HIP14 (ZDHHC17) is a neuronal palmitoyl acyltransferase (PAT) that palmitoylates SNAP-25, PSD-95, GAD65, synaptotagmin I, and huntingtin, but not paralemmin or synaptotagmin VII, demonstrating substrate specificity. Exogenous HIP14 enhances palmitoylation-dependent vesicular trafficking, and knockdown of endogenous HIP14 reduces clustering of PSD-95 and GAD65 in neurons.","method":"Biochemical palmitoylation assays, overexpression and siRNA knockdown in heterologous cells and neurons, vesicular trafficking assays","journal":"Neuron","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — in vitro enzymatic assay with substrate specificity, loss-of-function with defined cellular phenotype, replicated across multiple substrates and cell types","pmids":["15603740"],"is_preprint":false},{"year":2002,"finding":"HIP14 (ZDHHC17) localizes to the Golgi and cytoplasmic vesicles, and functionally rescues temperature-sensitive lethality and endocytosis defects in akr1Δ yeast, establishing a role for HIP14 in intracellular trafficking and endocytosis. Its interaction with huntingtin is inversely correlated with polyglutamine tract length.","method":"Yeast two-hybrid, subcellular localization (co-localization with Golgi markers), yeast complementation assay (rescue of akr1Δ phenotype)","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — functional rescue in yeast (orthologous system), subcellular localization, Y2H interaction with defined domain dependency","pmids":["12393793"],"is_preprint":false},{"year":2006,"finding":"Huntingtin (htt) is palmitoylated at cysteine 214 by HIP14 (ZDHHC17), which is essential for htt trafficking and function. Polyglutamine expansion reduces htt-HIP14 interaction and htt palmitoylation. Palmitoylation-resistant htt (C214 mutant) accelerates inclusion formation and increases neuronal toxicity. HIP14 overexpression reduces inclusions, while HIP14 downregulation increases them.","method":"Metabolic palmitoylation labeling, site-directed mutagenesis of htt Cys214, siRNA knockdown, overexpression in mouse neurons, inclusion body quantification","journal":"Nature neuroscience","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — mutagenesis of palmitoylation site with functional readout, loss- and gain-of-function experiments, replicated across multiple approaches","pmids":["16699508"],"is_preprint":false},{"year":2008,"finding":"HIP14 (ZDHHC17) mediates electrogenic, voltage-dependent, saturable Mg2+ uptake when expressed in Xenopus oocytes (Km ~0.87 mM). Inhibition of palmitoylation (2-bromopalmitate) or deletion of the DHHC motif reduces HIP14-mediated Mg2+ transport by ~50%, suggesting autopalmitoylation regulates its Mg2+ transport function. HIP14 localizes to Golgi and sub-plasma membrane vesicles, with redistribution under low-Mg2+ conditions.","method":"Xenopus oocyte electrophysiology (Mg2+ uptake assays), DHHC deletion mutagenesis, GFP-fusion localization in transfected epithelial cells, 2-bromopalmitate pharmacological inhibition","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 1–2 / Moderate — functional electrophysiology in Xenopus oocytes with mutagenesis, single lab, palmitoylation not directly measured","pmids":["18794299"],"is_preprint":false},{"year":2011,"finding":"Wild-type HTT modulates HIP14 (ZDHHC17) enzymatic activity: HTT itself is palmitoylated by HIP14, and wild-type HTT in turn potentiates HIP14-mediated palmitoylation of SNAP25 in vitro. In mice with reduced HTT (hdh+/- or HTT-ASO knockdown), HIP14 palmitoylation and the palmitoylation of its substrates SNAP25 and GluR1 are reduced in vivo. Among 23 DHHC PATs, HIP14 and HIP14L (DHHC13) are the two major PATs that palmitoylate HTT.","method":"In vitro palmitoylation assay, HTT antisense oligonucleotide knockdown in cortical neurons, brain biochemistry from hdh+/- mice, acyl-RAC/ABE palmitoylation assay","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — in vitro enzymatic assay plus in vivo genetic confirmation in two independent mouse models, multiple orthogonal methods","pmids":["21636527"],"is_preprint":false},{"year":2011,"finding":"Hip14 (ZDHHC17) knockout mice exhibit behavioral, biochemical, and neuropathological defects reminiscent of Huntington disease. Palmitoylation of HIP14 substrates (other than HTT itself) is reduced in Hip14−/− brains. HIP14 is dysfunctional in YAC128 (mutant HTT) mice, indicating mutant HTT impairs HIP14 palmitoyl transferase activity in vivo.","method":"Hip14 gene-trap knockout mouse generation, palmitoylation assays in brain tissue, behavioral testing, neuropathological analysis, YAC128 mouse model comparison","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — constitutive knockout with multiple biochemical and neuropathological endpoints, replicated by independent mouse models","pmids":["21775500"],"is_preprint":false},{"year":2013,"finding":"Constitutive loss of Hip14 (ZDHHC17) in mice produces marked alterations in synaptic function across multiple brain regions, and significantly impairs hippocampal long-term plasticity and memory, demonstrating that a single PAT has non-redundant roles in synaptic physiology.","method":"Hip14 knockout mouse, electrophysiology (LTP recordings), behavioral memory tests (hippocampus-dependent tasks)","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — constitutive knockout with electrophysiological and behavioral readouts, replicated across brain regions","pmids":["24277827"],"is_preprint":false},{"year":2014,"finding":"The ankyrin repeat (AR) domain of HIP14 (ZDHHC17) mediates its interaction with HTT. HTT amino acids 1–548 are sufficient for full interaction; partial interaction occurs with HTT 1–427 and HTT 224–548. Deletion of residues 257–315 reduces but does not abolish binding, suggesting two potential binding domains near residues 224 and 427.","method":"Co-immunoprecipitation with N- and C-terminal HTT deletion constructs, HIP14-GFP pulldown assays","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — systematic deletion mapping by Co-IP, single lab, multiple constructs","pmids":["24651384"],"is_preprint":false},{"year":2014,"finding":"Yeast two-hybrid screening identified a large overlap between HIP14 (ZDHHC17) interactors and published HTT interactors. Three novel HIP14 substrates were confirmed: GPM6A, SPRED1, and SPRED3, each palmitoylated by HIP14. Optineurin co-immunoprecipitates with HIP14 but is not palmitoylated by it.","method":"Yeast two-hybrid screen, co-immunoprecipitation, palmitoylation assay (acyl-RAC) for substrate confirmation","journal":"Human molecular genetics","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — Y2H plus biochemical palmitoylation assay for substrate validation, single lab","pmids":["24705354"],"is_preprint":false},{"year":2015,"finding":"The ankyrin repeat (AR) domain of zDHHC17 (HIP14) and zDHHC13 recognizes a conserved short linear motif with consensus [VIAP][VIT]XXQP in substrates including SNAP25, SNAP23, cysteine string protein, huntingtin, CLIP-3, and MAP6, mediating substrate recruitment prior to S-acylation.","method":"Peptide array binding assays, mutational analysis, in vitro S-acylation assays, sequence motif analysis across substrate proteins","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — motif identified by peptide arrays and validated by mutagenesis plus S-acylation assays, multiple substrates tested","pmids":["26198635"],"is_preprint":false},{"year":2015,"finding":"ZDHHC17 is required for proper TrkA-tubulin complex formation in PC12 cells, promoting ERK1/2 phosphorylation and axon outgrowth. Knockdown of ZDHHC17 in zebrafish results in motor dysfunction due to defective axon outgrowth in spinal motor neurons. The promotion of ERK1/2 phosphorylation by ZDHHC17 overexpression was independent of its palmitoyl transferase activity.","method":"ZDHHC17 siRNA knockdown in zebrafish (motor behavior, immunolabeling of axons), siRNA in NSCs and PC12 cells, co-immunoprecipitation of TrkA-tubulin, ERK1/2 phosphorylation western blot, overexpression experiments","journal":"Molecular and cellular neurosciences","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — loss-of-function in zebrafish with morphological readout, Co-IP for complex, single lab, PAT-independence not confirmed by mutagenesis in full","pmids":["26232532"],"is_preprint":false},{"year":2016,"finding":"Adult-specific deletion of Hip14 (ZDHHC17) in mice leads to rapid progressive paralysis and death within 10 weeks, accompanied by striatal synaptic deficits (reduced transmitter release probability, altered spontaneous postsynaptic currents), behavioral deficits, and cortical microgliosis/astrogliosis, demonstrating that HIP14 is essential for maintenance of neuronal integrity and life in the adult.","method":"Inducible conditional knockout (iHip14Δ/Δ) mice, electrophysiology (striatal synaptic recordings), behavioral tests, brain histology/immunohistochemistry","journal":"BMC biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — inducible conditional knockout with electrophysiological, behavioral, and histological endpoints, distinguishes developmental from adult function","pmids":["27927242"],"is_preprint":false},{"year":2017,"finding":"Using peptide arrays based on SNAP25 and CSPα zDHHC AR-binding motifs (zDABM), a position-specific scoring matrix was derived for zDHHC17 AR binding, predicting and validating 90 human proteins as putative zDHHC17 interactors via their zDABM sequences, including all SNAP25, sprouty, cornifelin, ankyrin, and SLAIN-motif family members.","method":"Peptide array binding assays (400 peptides), PSSM construction, in vitro binding validation of predicted interactors","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — systematic peptide array with bioinformatic validation, single lab, interaction confirmed biochemically for subset","pmids":["28882895"],"is_preprint":false},{"year":2020,"finding":"ZDHHC17 interacts with MAP2K4 and p38/JNK to form a signaling module that activates JNK and p38 MAPK pathways, promoting GBM cell tumorigenicity and glioma stem cell self-renewal. Co-immunoprecipitation and GST pulldown confirmed the ZDHHC17-MAP2K4 interaction. A small molecule genistein disrupts ZDHHC17-MAP2K4 complex formation.","method":"Co-immunoprecipitation, GST pulldown, pharmacological inhibition (genistein), in vitro and in vivo tumor models, flow cytometry, transwell migration assay","journal":"Theranostics","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — reciprocal Co-IP and GST pulldown with functional phenotype, single lab, pathway placement by pharmacological disruption","pmids":["31938047"],"is_preprint":false},{"year":2020,"finding":"ZDHHC17-dependent palmitoylation of DLK enables DLK-dependent somal degeneration after optic nerve crush (ONC), while ZDHHC17-dependent palmitoylation of NMNAT2 maintains distal axon integrity in healthy optic nerves. Conserved zDABM motifs in both DLK and NMNAT2 govern their ZDHHC17-dependent regulation. ZDHHC17 thus couples two previously considered independent pathways of somal and distal axon degeneration.","method":"Optic nerve crush in conditional ZDHHC17 knockout mice/RGCs, palmitoylation assays, motif mutagenesis, DRG neuron loss-of-function experiments","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional KO with two independent substrates, motif mutagenesis, and distinct anatomical readouts (soma vs. distal axon), multiple cell types","pmids":["33207199"],"is_preprint":false},{"year":2021,"finding":"ZDHHC17 is required as a host factor for SADS-CoV genomic RNA replication. The DHHC domain (palmitoylation-active domain) of ZDHHC17 is specifically required for this function, as truncation mutagenesis removing the DHHC domain abolished virus-supporting activity. The palmitoylation inhibitor 2-bromopalmitate suppresses SADS-CoV infection.","method":"Genome-wide CRISPR knockout screen (HeLa cells), truncation mutagenesis of ZDHHC17, viral replication assays, 2-bromopalmitate pharmacological inhibition","journal":"mBio","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — CRISPR KO plus truncation mutagenesis in viral infection context, single lab, mechanism only partially resolved (palmitoylation required but direct viral substrate not identified)","pmids":["34700373"],"is_preprint":false},{"year":2022,"finding":"zDHHC17 can S-acylate Sprouty-2 (Spry2) and SPRED3 via zDABM-independent mechanisms in addition to zDABM-dependent binding. The cysteine-rich SPR domain of SPRED3 (and Spry2) interacts with zDHHC17 independently of the ankyrin repeat domain, revealing a novel mode of enzyme-substrate recognition.","method":"Mutational analysis of zDABM and SPR domains, Co-IP, in vitro S-acylation assays, zDHHC17 ANK-deletion mutant binding experiments","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — systematic mutagenesis with both in vitro S-acylation assays and binding experiments, multiple mutant constructs, single lab but multiple orthogonal methods","pmids":["36442513"],"is_preprint":false},{"year":2023,"finding":"ZDHHC17 is the major palmitoyl acyltransferase responsible for HSP90α palmitoylation in granulosa cells. ZDHHC17-mediated palmitoylation of HSP90α is required for CYP19A1 (aromatase) expression and androgen-to-estrogen conversion. Loss of ZDHHC17 reduces HSP90α palmitoylation, decreases CYP19A1 levels, and impairs estrogen production.","method":"siRNA knockdown of ZDHHC17 in granulosa cells, resin-assisted capture palmitoylation assay, CYP19A1 expression analysis, hormone measurement, in vivo PCOS model","journal":"Molecular and cellular endocrinology","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — loss-of-function with palmitoylation assay and functional downstream readout (CYP19A1/estrogen), single lab","pmids":["37769867"],"is_preprint":false},{"year":2024,"finding":"zDHHC17 S-palmitoylates Smad7 at Cys202, Cys225, Cys415, and Cys417 in mammary epithelial cells. Palmitoylation at Cys415 and Cys417 promotes nuclear-to-cytoplasmic translocation of Smad7, enhances Smad7 protein stability, and enforces its inhibitory effect on TGF-β-induced Smad transcriptional responses.","method":"Resin-assisted capture (RAC) and metabolic palmitoylation labeling, site-directed mutagenesis of Smad7 cysteine residues, subcellular fractionation, TGF-β/Smad transcriptional reporter assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — direct palmitoylation assay with cysteine mutagenesis, subcellular localization experiment tied to functional TGF-β signaling outcome, multiple orthogonal methods","pmids":["38876303"],"is_preprint":false},{"year":2026,"finding":"ZDHHC17 palmitoylates CDK4, and this palmitoylation facilitates CDK4 interaction with cyclin D1. CDK4 palmitoylation depends on TRAF6-mediated K11-linked ubiquitination of CDK4. Blockade of either CDK4 palmitoylation or ubiquitination markedly reduces CDK4 kinase activity and causes cell cycle arrest. ZDHHC17 depletion reduces cell cycle progression and immune response in a high-fat-diet mouse model.","method":"2-BP palmitoylation inhibition, ZDHHC17 siRNA/depletion, Co-IP (CDK4-cyclin D1), ubiquitination assays (K11-linkage specificity), CDK4 kinase activity assay, in vivo mouse model","journal":"Advanced science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP, kinase assay, and ubiquitination assay in single lab, functional cell cycle readout; preprint-grade peer review status uncertain for 2026 publication","pmids":["42133178"],"is_preprint":false},{"year":2025,"finding":"Drosophila Hip14 (ortholog of ZDHHC17) acts as a rate-limiting factor for lysosome formation and secretory granule-lysosome fusion, lysosomal acidification, and biosynthetic transport of lysosomal hydrolases in larval salivary glands and neurons. Hip14 overexpression accelerates these processes, and Hip14 loss in adult neurons impairs lysosome formation and neuromuscular function. Rab2 GTPase hyperactivation rescues lysosomal and neuronal defects caused by Hip14 or Patsas (HIP14L ortholog) loss.","method":"Drosophila Hip14 and patsas mutants/RNAi, larval salivary gland and neuron imaging, lysosomal acidification assays, hydrolase trafficking assays, genetic epistasis with constitutively active Rab2","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Drosophila ortholog with genetic epistasis (Rab2 rescue), multiple cellular readouts, single preprint lab, not yet peer-reviewed","pmids":["bio_10.1101_2025.02.06.636816"],"is_preprint":true}],"current_model":"ZDHHC17 (HIP14) is a Golgi-localized palmitoyl acyltransferase whose DHHC catalytic domain and N-terminal ankyrin repeat domain cooperate to recruit and S-acylate a large set of neuronal and non-neuronal substrates (including huntingtin, SNAP-25, PSD-95, GAD65, NMNAT2, DLK, CDK4, Smad7, and HSP90α) via recognition of a conserved zDABM motif or, for some substrates (Sprouty/SPRED family), through the SPR domain in a zDABM-independent manner; wild-type huntingtin in turn modulates HIP14's own palmitoylation and enzymatic activity, and loss of HIP14 function—whether by constitutive knockout, adult-specific deletion, or impairment by mutant huntingtin—causes progressive synaptic dysfunction, neurodegeneration, and lethality associated with reduced palmitoylation of its substrate pool."},"narrative":{"mechanistic_narrative":"ZDHHC17 (HIP14) is a Golgi- and vesicle-localized DHHC palmitoyl acyltransferase that S-acylates a broad set of neuronal and non-neuronal substrates, coupling protein palmitoylation to intracellular trafficking, synaptic function, and signaling [PMID:15603740, PMID:12393793]. It recognizes many substrates through its N-terminal ankyrin repeat (AR) domain, which binds a conserved zDHHC AR-binding motif (zDABM, consensus [VIAP][VIT]XXQP) present in SNAP25, cysteine string protein, huntingtin, MAP6, and dozens of other predicted interactors, recruiting them prior to S-acylation by the DHHC catalytic domain [PMID:26198635, PMID:28882895]; for the Sprouty/SPRED family it engages substrates through their cysteine-rich SPR domain in a zDABM- and AR-independent manner [PMID:36442513]. Validated substrates include SNAP-25, PSD-95, GAD65, synaptotagmin I, and huntingtin (palmitoylated at Cys214) [PMID:15603740, PMID:16699508], as well as GPM6A, SPRED1/SPRED3, the axonal regulators DLK and NMNAT2, HSP90α, Smad7, and CDK4 [PMID:24705354, PMID:33207199, PMID:37769867, PMID:38876303, PMID:42133178]. Its enzymatic output is reciprocally tuned by huntingtin: wild-type HTT is both a substrate and a potentiator of HIP14-mediated palmitoylation, and polyglutamine-expanded HTT reduces HTT–HIP14 interaction and impairs HIP14 activity in vivo [PMID:16699508, PMID:21636527, PMID:21775500, PMID:24651384]. Loss of HIP14 function—by constitutive knockout, adult-specific deletion, or mutant-HTT impairment—reduces substrate palmitoylation and causes progressive synaptic dysfunction, neurodegeneration, paralysis, and lethality, establishing this single PAT as non-redundant for synaptic plasticity and adult neuronal maintenance [PMID:21775500, PMID:24277827, PMID:27927242]. Beyond the nervous system, ZDHHC17 supports diverse cellular programs through substrate palmitoylation, including MAPK signaling in glioma, HSP90α/aromatase-dependent estrogen synthesis, TGF-β regulation via Smad7, CDK4-driven cell cycle progression, and SADS-CoV RNA replication [PMID:31938047, PMID:33207199, PMID:37769867, PMID:38876303, PMID:42133178, PMID:34700373].","teleology":[{"year":2002,"claim":"Established HIP14 as a huntingtin-interacting protein with a defined subcellular home and a conserved trafficking function, anchoring later mechanistic work.","evidence":"Yeast two-hybrid, Golgi co-localization, and rescue of akr1Δ yeast trafficking/endocytosis defects","pmids":["12393793"],"confidence":"High","gaps":["Enzymatic activity not yet demonstrated at this stage","Molecular basis of polyglutamine-sensitive interaction unresolved"]},{"year":2004,"claim":"Defined HIP14 as a substrate-selective neuronal palmitoyl acyltransferase, answering whether it is an enzyme and which proteins it modifies.","evidence":"In vitro palmitoylation assays with multiple substrates plus siRNA knockdown showing reduced PSD-95/GAD65 clustering in neurons","pmids":["15603740"],"confidence":"High","gaps":["Substrate recognition mechanism not yet defined","Catalytic residue requirements not mapped"]},{"year":2006,"claim":"Identified huntingtin Cys214 as a specific HIP14 palmitoylation site whose modification controls htt trafficking and toxicity, linking enzyme activity to disease.","evidence":"Metabolic labeling, Cys214 mutagenesis, knockdown/overexpression, and inclusion quantification in mouse neurons","pmids":["16699508"],"confidence":"High","gaps":["Whether reduced htt palmitoylation is causal in vivo not yet tested","Effect on broader substrate pool unaddressed"]},{"year":2008,"claim":"Proposed an unexpected Mg2+ transport function regulated by autopalmitoylation, raising the possibility of activity beyond classical PAT chemistry.","evidence":"Xenopus oocyte electrophysiology with DHHC deletion and 2-bromopalmitate inhibition","pmids":["18794299"],"confidence":"Medium","gaps":["Palmitoylation not directly measured","Single lab, not independently confirmed","Physiological relevance of Mg2+ transport unestablished"]},{"year":2011,"claim":"Showed bidirectional regulation between HTT and HIP14 and demonstrated in vivo that reduced or mutant HTT lowers HIP14 activity, framing palmitoylation deficits as a Huntington disease mechanism.","evidence":"In vitro palmitoylation assays, HTT-ASO knockdown and hdh+/- brain biochemistry, plus Hip14 gene-trap knockout and YAC128 comparison with behavioral/neuropathological endpoints","pmids":["21636527","21775500"],"confidence":"High","gaps":["Mechanism by which mutant HTT impairs HIP14 catalysis not resolved","Relative contribution of individual substrates to phenotype unclear"]},{"year":2013,"claim":"Demonstrated that a single PAT has non-redundant roles in synaptic plasticity and memory, ruling out full compensation by other DHHC enzymes.","evidence":"Hip14 knockout mouse electrophysiology (LTP) and hippocampus-dependent memory tasks","pmids":["24277827"],"confidence":"High","gaps":["Causal substrates underlying plasticity deficit not identified","Developmental vs ongoing requirement not separated here"]},{"year":2014,"claim":"Mapped the AR domain as the huntingtin-binding region and expanded the substrate/interactor set, beginning to define recognition rules.","evidence":"Co-IP deletion mapping of HTT, plus Y2H screen with acyl-RAC validation of GPM6A, SPRED1, SPRED3","pmids":["24651384","24705354"],"confidence":"Medium","gaps":["Exact binding motif not yet defined","Distinction between binding and palmitoylation (e.g. optineurin) mechanistically unexplained"]},{"year":2015,"claim":"Defined the zDABM linear motif recognized by the AR domain, providing a generalizable substrate-recruitment code, and uncovered a PAT-independent role in TrkA signaling and axon outgrowth.","evidence":"Peptide arrays, mutagenesis, and in vitro S-acylation across multiple substrates; zebrafish/PC12 knockdown with TrkA-tubulin Co-IP and ERK1/2 readouts","pmids":["26198635","26232532"],"confidence":"High","gaps":["zDABM-independent recognition modes not yet defined","PAT-independence of ERK signaling not fully confirmed by catalytic-dead mutagenesis"]},{"year":2016,"claim":"Separated developmental from adult function, showing HIP14 is continuously required for neuronal integrity and survival in the adult brain.","evidence":"Inducible conditional knockout (iHip14Δ/Δ) mice with striatal electrophysiology, behavior, and histology","pmids":["27927242"],"confidence":"High","gaps":["Molecular pathway from substrate hypopalmitoylation to degeneration not delineated","Specific lethal substrate(s) unidentified"]},{"year":2017,"claim":"Built a predictive PSSM for AR binding, scaling substrate identification to ~90 candidate human interactors and generalizing the recruitment model.","evidence":"Peptide arrays (400 peptides), PSSM construction, and in vitro binding validation of a predicted subset","pmids":["28882895"],"confidence":"Medium","gaps":["Most predicted interactors not validated as palmitoylation substrates","Binding does not guarantee acylation"]},{"year":2020,"claim":"Extended ZDHHC17 function to non-neuronal disease (glioma) signaling and to coordinated control of distinct axon degeneration pathways via substrate palmitoylation.","evidence":"Co-IP/GST pulldown of MAP2K4 with JNK/p38 readouts in GBM; conditional KO optic nerve crush with DLK and NMNAT2 zDABM mutagenesis","pmids":["31938047","33207199"],"confidence":"Medium","gaps":["MAP2K4 module placement relies partly on pharmacological disruption","Whether DLK/NMNAT2 effects generalize beyond optic nerve unaddressed"]},{"year":2022,"claim":"Revealed a second, AR-independent substrate-recognition mode through the SPR domain of Sprouty/SPRED proteins, broadening the enzyme's engagement repertoire.","evidence":"zDABM and SPR domain mutagenesis, Co-IP, and in vitro S-acylation with ANK-deletion constructs","pmids":["36442513"],"confidence":"High","gaps":["Structural basis of SPR-domain recognition unknown","Generality of this mode across other substrates untested"]},{"year":2024,"claim":"Demonstrated regulatory palmitoylation of a signaling effector (Smad7), showing site-specific acylation controls localization, stability, and pathway output.","evidence":"RAC/metabolic labeling, Smad7 cysteine mutagenesis, subcellular fractionation, and TGF-β/Smad reporter assays in mammary epithelial cells","pmids":["38876303"],"confidence":"High","gaps":["In vivo relevance to TGF-β biology not shown","Whether AR/zDABM or SPR recognition mediates Smad7 binding unclear"]},{"year":2023,"claim":"Connected ZDHHC17 to endocrine function via HSP90α palmitoylation and aromatase-dependent estrogen synthesis.","evidence":"siRNA knockdown in granulosa cells, RAC palmitoylation assay, CYP19A1/hormone measurement, and in vivo PCOS model","pmids":["37769867"],"confidence":"Medium","gaps":["Direct HSP90α palmitoylation site not mapped","Mechanistic link from HSP90α acylation to CYP19A1 expression incomplete"]},{"year":2026,"claim":"Linked ZDHHC17 to cell cycle control by palmitoylating CDK4 in coordination with TRAF6-mediated ubiquitination to promote cyclin D1 binding and kinase activity.","evidence":"2-BP inhibition, depletion, CDK4-cyclin D1 Co-IP, K11-ubiquitination and kinase assays, and a high-fat-diet mouse model","pmids":["42133178"],"confidence":"Medium","gaps":["CDK4 palmitoylation site not defined","Crosstalk mechanism between palmitoylation and K11 ubiquitination unresolved","Single lab"]},{"year":2025,"claim":"Extended a conserved role to lysosome biogenesis and secretory granule-lysosome fusion, placing Hip14 upstream of Rab2-dependent membrane trafficking.","evidence":"Drosophila Hip14/patsas mutants and RNAi with lysosomal imaging, hydrolase trafficking assays, and Rab2 genetic epistasis (preprint)","pmids":["bio_10.1101_2025.02.06.636816"],"confidence":"Medium","gaps":["Not yet peer-reviewed","Mammalian conservation of the lysosomal role untested","Direct palmitoylation substrate driving Rab2 effect unidentified"]},{"year":null,"claim":"How ZDHHC17 substrate selection, catalytic turnover, and HTT-dependent activity modulation are structurally integrated—and which specific substrate hypopalmitoylation events drive neurodegeneration—remains unresolved.","evidence":"No structural model or in vivo substrate-attribution experiment in the timeline addresses this","pmids":[],"confidence":"Low","gaps":["No structure of the AR-DHHC enzyme with substrate","Causal substrate(s) for lethality/neurodegeneration not pinpointed","Mechanism of mutant-HTT impairment of catalysis unknown"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[0,2,4,9,14,16,17,18,19]},{"term_id":"GO:0016740","term_label":"transferase activity","supporting_discovery_ids":[0,9,18]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[9,12,16]}],"localization":[{"term_id":"GO:0005794","term_label":"Golgi apparatus","supporting_discovery_ids":[1,3]},{"term_id":"GO:0031410","term_label":"cytoplasmic vesicle","supporting_discovery_ids":[1,3]}],"pathway":[{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[0,9,18]},{"term_id":"R-HSA-112316","term_label":"Neuronal System","supporting_discovery_ids":[0,6,11,14]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[13,18,10]}],"complexes":[],"partners":["HTT","SNAP25","SPRED1","SPRED3","MAP2K4","DLK","CDK4","HSP90AA1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q8IUH5","full_name":"Palmitoyltransferase ZDHHC17","aliases":["Acyltransferase ZDHHC17","DHHC domain-containing cysteine-rich protein 17","DHHC17","Huntingtin yeast partner H","Huntingtin-interacting protein 14","HIP-14","Huntingtin-interacting protein 3","HIP-3","Huntingtin-interacting protein H","Putative MAPK-activating protein PM11","Putative NF-kappa-B-activating protein 205","Zinc finger DHHC domain-containing protein 17"],"length_aa":632,"mass_kda":72.6,"function":"Palmitoyltransferase that catalyzes the addition of palmitate onto various protein substrates and is involved in a variety of cellular processes (PubMed:15489887, PubMed:15603740, PubMed:24705354, PubMed:27911442, PubMed:28757145). Has no stringent fatty acid selectivity and in addition to palmitate can also transfer onto target proteins myristate from tetradecanoyl-CoA and stearate from octadecanoyl-CoA (By similarity). Palmitoyltransferase specific for a subset of neuronal proteins, including SNAP25, DLG4/PSD95, GAD2, SYT1 and HTT (PubMed:15489887, PubMed:15603740, PubMed:19139280, PubMed:28757145). Also palmitoylates neuronal protein GPM6A as well as SPRED1 and SPRED3 (PubMed:24705354). Could also play a role in axonogenesis through the regulation of NTRK1 and the downstream ERK1/ERK2 signaling cascade (By similarity). May be involved in the sorting or targeting of critical proteins involved in the initiating events of endocytosis at the plasma membrane (PubMed:12393793). May play a role in Mg(2+) transport (PubMed:18794299). Could also palmitoylate DNAJC5 and regulate its localization to the Golgi membrane (By similarity). Palmitoylates CASP6, thereby preventing its dimerization and subsequent activation (PubMed:27911442)","subcellular_location":"Golgi apparatus membrane; Cytoplasmic vesicle membrane; Presynaptic cell membrane","url":"https://www.uniprot.org/uniprotkb/Q8IUH5/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/ZDHHC17","classification":"Not Classified","n_dependent_lines":11,"n_total_lines":1208,"dependency_fraction":0.009105960264900662},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/ZDHHC17","total_profiled":1310},"omim":[{"mim_id":"616143","title":"LYSOPHOSPHOLIPASE II; LYPLA2","url":"https://www.omim.org/entry/616143"},{"mim_id":"612815","title":"ZDHHC PALMITOYLTRANSFERASE 13; ZDHHC13","url":"https://www.omim.org/entry/612815"},{"mim_id":"608701","title":"NICOTINAMIDE NUCLEOTIDE ADENYLYLTRANSFERASE 2; NMNAT2","url":"https://www.omim.org/entry/608701"},{"mim_id":"607799","title":"ZDHHC PALMITOYLTRANSFERASE 17; ZDHHC17","url":"https://www.omim.org/entry/607799"},{"mim_id":"605599","title":"LYSOPHOSPHOLIPASE I; LYPLA1","url":"https://www.omim.org/entry/605599"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Golgi apparatus","reliability":"Supported"},{"location":"Vesicles","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/ZDHHC17"},"hgnc":{"alias_symbol":["HIP14","HYPH","KIAA0946"],"prev_symbol":[]},"alphafold":{"accession":"Q8IUH5","domains":[{"cath_id":"1.25.40.20","chopping":"57-149","consensus_level":"medium","plddt":97.4414,"start":57,"end":149},{"cath_id":"1.25.40.20","chopping":"184-288","consensus_level":"medium","plddt":92.8981,"start":184,"end":288},{"cath_id":"-","chopping":"355-413_479-632","consensus_level":"medium","plddt":90.8966,"start":355,"end":632},{"cath_id":"-","chopping":"416-473","consensus_level":"medium","plddt":92.7634,"start":416,"end":473},{"cath_id":"1.10.287","chopping":"297-353","consensus_level":"medium","plddt":90.8742,"start":297,"end":353}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8IUH5","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q8IUH5-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q8IUH5-F1-predicted_aligned_error_v6.png","plddt_mean":87.44},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=ZDHHC17","jax_strain_url":"https://www.jax.org/strain/search?query=ZDHHC17"},"sequence":{"accession":"Q8IUH5","fasta_url":"https://rest.uniprot.org/uniprotkb/Q8IUH5.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q8IUH5/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8IUH5"}},"corpus_meta":[{"pmid":"15603740","id":"PMC_15603740","title":"Huntingtin-interacting protein HIP14 is a palmitoyl transferase involved in palmitoylation and trafficking of multiple neuronal proteins.","date":"2004","source":"Neuron","url":"https://pubmed.ncbi.nlm.nih.gov/15603740","citation_count":253,"is_preprint":false},{"pmid":"16699508","id":"PMC_16699508","title":"Palmitoylation of huntingtin by HIP14 is essential for its trafficking and function.","date":"2006","source":"Nature neuroscience","url":"https://pubmed.ncbi.nlm.nih.gov/16699508","citation_count":247,"is_preprint":false},{"pmid":"12393793","id":"PMC_12393793","title":"HIP14, a novel ankyrin domain-containing protein, links huntingtin to intracellular trafficking and endocytosis.","date":"2002","source":"Human molecular genetics","url":"https://pubmed.ncbi.nlm.nih.gov/12393793","citation_count":175,"is_preprint":false},{"pmid":"21775500","id":"PMC_21775500","title":"Altered palmitoylation and neuropathological deficits in mice lacking HIP14.","date":"2011","source":"Human molecular 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chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/18794299","citation_count":63,"is_preprint":false},{"pmid":"31938047","id":"PMC_31938047","title":"Activation of JNK and p38 MAPK Mediated by ZDHHC17 Drives Glioblastoma Multiforme Development and Malignant Progression.","date":"2020","source":"Theranostics","url":"https://pubmed.ncbi.nlm.nih.gov/31938047","citation_count":60,"is_preprint":false},{"pmid":"24705354","id":"PMC_24705354","title":"The palmitoyl acyltransferase HIP14 shares a high proportion of interactors with huntingtin: implications for a role in the pathogenesis of Huntington's disease.","date":"2014","source":"Human molecular genetics","url":"https://pubmed.ncbi.nlm.nih.gov/24705354","citation_count":58,"is_preprint":false},{"pmid":"24277827","id":"PMC_24277827","title":"Memory and synaptic deficits in Hip14/DHHC17 knockout mice.","date":"2013","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/24277827","citation_count":46,"is_preprint":false},{"pmid":"28882895","id":"PMC_28882895","title":"Peptide array-based screening reveals a large number of proteins interacting with the ankyrin-repeat domain of the zDHHC17 S-acyltransferase.","date":"2017","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/28882895","citation_count":32,"is_preprint":false},{"pmid":"33207199","id":"PMC_33207199","title":"Coupled Control of Distal Axon Integrity and Somal Responses to Axonal Damage by the Palmitoyl Acyltransferase ZDHHC17.","date":"2020","source":"Cell reports","url":"https://pubmed.ncbi.nlm.nih.gov/33207199","citation_count":30,"is_preprint":false},{"pmid":"27927242","id":"PMC_27927242","title":"Sudden death due to paralysis and synaptic and behavioral deficits when Hip14/Zdhhc17 is deleted in adult mice.","date":"2016","source":"BMC biology","url":"https://pubmed.ncbi.nlm.nih.gov/27927242","citation_count":25,"is_preprint":false},{"pmid":"24651384","id":"PMC_24651384","title":"Identification of binding sites in Huntingtin for the Huntingtin Interacting Proteins HIP14 and HIP14L.","date":"2014","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/24651384","citation_count":25,"is_preprint":false},{"pmid":"34700373","id":"PMC_34700373","title":"Identification of ZDHHC17 as a Potential Drug Target for Swine Acute Diarrhea Syndrome Coronavirus Infection.","date":"2021","source":"mBio","url":"https://pubmed.ncbi.nlm.nih.gov/34700373","citation_count":21,"is_preprint":false},{"pmid":"30269354","id":"PMC_30269354","title":"Potentially critical roles of TNPO1, RAP1B, ZDHHC17, and PPM1B in the progression of coronary atherosclerosis through microarray data analysis.","date":"2018","source":"Journal of cellular biochemistry","url":"https://pubmed.ncbi.nlm.nih.gov/30269354","citation_count":20,"is_preprint":false},{"pmid":"26232532","id":"PMC_26232532","title":"ZDHHC17 promotes axon outgrowth by regulating TrkA-tubulin complex formation.","date":"2015","source":"Molecular and cellular neurosciences","url":"https://pubmed.ncbi.nlm.nih.gov/26232532","citation_count":15,"is_preprint":false},{"pmid":"36442513","id":"PMC_36442513","title":"S-acylation of Sprouty and SPRED proteins by the S-acyltransferase zDHHC17 involves a novel mode of enzyme-substrate interaction.","date":"2022","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/36442513","citation_count":12,"is_preprint":false},{"pmid":"22649491","id":"PMC_22649491","title":"Low levels of human HIP14 are sufficient to rescue neuropathological, behavioural, and enzymatic defects due to loss of murine HIP14 in Hip14-/- mice.","date":"2012","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/22649491","citation_count":12,"is_preprint":false},{"pmid":"38876303","id":"PMC_38876303","title":"Smad7 palmitoylation by the S-acyltransferase zDHHC17 enhances its inhibitory effect on TGF-β/Smad signaling.","date":"2024","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/38876303","citation_count":11,"is_preprint":false},{"pmid":"24376823","id":"PMC_24376823","title":"Dysregulated striatal neuronal processing and impaired motor behavior in mice lacking huntingtin interacting protein 14 (HIP14).","date":"2013","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/24376823","citation_count":9,"is_preprint":false},{"pmid":"24961622","id":"PMC_24961622","title":"Altered Neuronal Dynamics in the Striatum on the Behavior of Huntingtin Interacting Protein 14 (HIP14) Knockout Mice.","date":"2013","source":"Brain sciences","url":"https://pubmed.ncbi.nlm.nih.gov/24961622","citation_count":5,"is_preprint":false},{"pmid":"37769867","id":"PMC_37769867","title":"ZDHHC17 participates in the pathogenesis of polycystic ovary syndrome by affecting androgen conversion to estrogen in granulosa cells.","date":"2023","source":"Molecular and cellular endocrinology","url":"https://pubmed.ncbi.nlm.nih.gov/37769867","citation_count":3,"is_preprint":false},{"pmid":"42133178","id":"PMC_42133178","title":"ZDHHC17-Mediated CDK4 Palmitoylation Drives Cell Cycle Progression and Orchestrates Cancer Immune Surveillance.","date":"2026","source":"Advanced science (Weinheim, Baden-Wurttemberg, Germany)","url":"https://pubmed.ncbi.nlm.nih.gov/42133178","citation_count":0,"is_preprint":false},{"pmid":"41445853","id":"PMC_41445853","title":"DNA Methylation-Regulated ZDHHC17 Promotes the Risk of Facial Skin Aging.","date":"2025","source":"Clinical, cosmetic and investigational dermatology","url":"https://pubmed.ncbi.nlm.nih.gov/41445853","citation_count":0,"is_preprint":false},{"pmid":null,"id":"bio_10.1101_2025.02.06.636816","title":"Huntington’s disease-associated ankyrin repeat palmitoyl transferases are rate-limiting factors in lysosome formation and fusion","date":"2025-02-08","source":"bioRxiv","url":"https://doi.org/10.1101/2025.02.06.636816","citation_count":0,"is_preprint":true}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":15938,"output_tokens":6043,"usd":0.069229,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":14709,"output_tokens":5232,"usd":0.102172,"stage2_stop_reason":"end_turn"},"total_usd":0.171401,"stage1_batch_id":"msgbatch_01UT1AahFPCAyn2uVweS7A9z","stage2_batch_id":"msgbatch_01HuKWtKNT4Pqj1bc8eEP5RV","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2004,\n      \"finding\": \"HIP14 (ZDHHC17) is a neuronal palmitoyl acyltransferase (PAT) that palmitoylates SNAP-25, PSD-95, GAD65, synaptotagmin I, and huntingtin, but not paralemmin or synaptotagmin VII, demonstrating substrate specificity. Exogenous HIP14 enhances palmitoylation-dependent vesicular trafficking, and knockdown of endogenous HIP14 reduces clustering of PSD-95 and GAD65 in neurons.\",\n      \"method\": \"Biochemical palmitoylation assays, overexpression and siRNA knockdown in heterologous cells and neurons, vesicular trafficking assays\",\n      \"journal\": \"Neuron\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — in vitro enzymatic assay with substrate specificity, loss-of-function with defined cellular phenotype, replicated across multiple substrates and cell types\",\n      \"pmids\": [\"15603740\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"HIP14 (ZDHHC17) localizes to the Golgi and cytoplasmic vesicles, and functionally rescues temperature-sensitive lethality and endocytosis defects in akr1Δ yeast, establishing a role for HIP14 in intracellular trafficking and endocytosis. Its interaction with huntingtin is inversely correlated with polyglutamine tract length.\",\n      \"method\": \"Yeast two-hybrid, subcellular localization (co-localization with Golgi markers), yeast complementation assay (rescue of akr1Δ phenotype)\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — functional rescue in yeast (orthologous system), subcellular localization, Y2H interaction with defined domain dependency\",\n      \"pmids\": [\"12393793\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Huntingtin (htt) is palmitoylated at cysteine 214 by HIP14 (ZDHHC17), which is essential for htt trafficking and function. Polyglutamine expansion reduces htt-HIP14 interaction and htt palmitoylation. Palmitoylation-resistant htt (C214 mutant) accelerates inclusion formation and increases neuronal toxicity. HIP14 overexpression reduces inclusions, while HIP14 downregulation increases them.\",\n      \"method\": \"Metabolic palmitoylation labeling, site-directed mutagenesis of htt Cys214, siRNA knockdown, overexpression in mouse neurons, inclusion body quantification\",\n      \"journal\": \"Nature neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — mutagenesis of palmitoylation site with functional readout, loss- and gain-of-function experiments, replicated across multiple approaches\",\n      \"pmids\": [\"16699508\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"HIP14 (ZDHHC17) mediates electrogenic, voltage-dependent, saturable Mg2+ uptake when expressed in Xenopus oocytes (Km ~0.87 mM). Inhibition of palmitoylation (2-bromopalmitate) or deletion of the DHHC motif reduces HIP14-mediated Mg2+ transport by ~50%, suggesting autopalmitoylation regulates its Mg2+ transport function. HIP14 localizes to Golgi and sub-plasma membrane vesicles, with redistribution under low-Mg2+ conditions.\",\n      \"method\": \"Xenopus oocyte electrophysiology (Mg2+ uptake assays), DHHC deletion mutagenesis, GFP-fusion localization in transfected epithelial cells, 2-bromopalmitate pharmacological inhibition\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — functional electrophysiology in Xenopus oocytes with mutagenesis, single lab, palmitoylation not directly measured\",\n      \"pmids\": [\"18794299\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Wild-type HTT modulates HIP14 (ZDHHC17) enzymatic activity: HTT itself is palmitoylated by HIP14, and wild-type HTT in turn potentiates HIP14-mediated palmitoylation of SNAP25 in vitro. In mice with reduced HTT (hdh+/- or HTT-ASO knockdown), HIP14 palmitoylation and the palmitoylation of its substrates SNAP25 and GluR1 are reduced in vivo. Among 23 DHHC PATs, HIP14 and HIP14L (DHHC13) are the two major PATs that palmitoylate HTT.\",\n      \"method\": \"In vitro palmitoylation assay, HTT antisense oligonucleotide knockdown in cortical neurons, brain biochemistry from hdh+/- mice, acyl-RAC/ABE palmitoylation assay\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — in vitro enzymatic assay plus in vivo genetic confirmation in two independent mouse models, multiple orthogonal methods\",\n      \"pmids\": [\"21636527\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Hip14 (ZDHHC17) knockout mice exhibit behavioral, biochemical, and neuropathological defects reminiscent of Huntington disease. Palmitoylation of HIP14 substrates (other than HTT itself) is reduced in Hip14−/− brains. HIP14 is dysfunctional in YAC128 (mutant HTT) mice, indicating mutant HTT impairs HIP14 palmitoyl transferase activity in vivo.\",\n      \"method\": \"Hip14 gene-trap knockout mouse generation, palmitoylation assays in brain tissue, behavioral testing, neuropathological analysis, YAC128 mouse model comparison\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — constitutive knockout with multiple biochemical and neuropathological endpoints, replicated by independent mouse models\",\n      \"pmids\": [\"21775500\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Constitutive loss of Hip14 (ZDHHC17) in mice produces marked alterations in synaptic function across multiple brain regions, and significantly impairs hippocampal long-term plasticity and memory, demonstrating that a single PAT has non-redundant roles in synaptic physiology.\",\n      \"method\": \"Hip14 knockout mouse, electrophysiology (LTP recordings), behavioral memory tests (hippocampus-dependent tasks)\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — constitutive knockout with electrophysiological and behavioral readouts, replicated across brain regions\",\n      \"pmids\": [\"24277827\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"The ankyrin repeat (AR) domain of HIP14 (ZDHHC17) mediates its interaction with HTT. HTT amino acids 1–548 are sufficient for full interaction; partial interaction occurs with HTT 1–427 and HTT 224–548. Deletion of residues 257–315 reduces but does not abolish binding, suggesting two potential binding domains near residues 224 and 427.\",\n      \"method\": \"Co-immunoprecipitation with N- and C-terminal HTT deletion constructs, HIP14-GFP pulldown assays\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — systematic deletion mapping by Co-IP, single lab, multiple constructs\",\n      \"pmids\": [\"24651384\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Yeast two-hybrid screening identified a large overlap between HIP14 (ZDHHC17) interactors and published HTT interactors. Three novel HIP14 substrates were confirmed: GPM6A, SPRED1, and SPRED3, each palmitoylated by HIP14. Optineurin co-immunoprecipitates with HIP14 but is not palmitoylated by it.\",\n      \"method\": \"Yeast two-hybrid screen, co-immunoprecipitation, palmitoylation assay (acyl-RAC) for substrate confirmation\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — Y2H plus biochemical palmitoylation assay for substrate validation, single lab\",\n      \"pmids\": [\"24705354\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"The ankyrin repeat (AR) domain of zDHHC17 (HIP14) and zDHHC13 recognizes a conserved short linear motif with consensus [VIAP][VIT]XXQP in substrates including SNAP25, SNAP23, cysteine string protein, huntingtin, CLIP-3, and MAP6, mediating substrate recruitment prior to S-acylation.\",\n      \"method\": \"Peptide array binding assays, mutational analysis, in vitro S-acylation assays, sequence motif analysis across substrate proteins\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — motif identified by peptide arrays and validated by mutagenesis plus S-acylation assays, multiple substrates tested\",\n      \"pmids\": [\"26198635\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"ZDHHC17 is required for proper TrkA-tubulin complex formation in PC12 cells, promoting ERK1/2 phosphorylation and axon outgrowth. Knockdown of ZDHHC17 in zebrafish results in motor dysfunction due to defective axon outgrowth in spinal motor neurons. The promotion of ERK1/2 phosphorylation by ZDHHC17 overexpression was independent of its palmitoyl transferase activity.\",\n      \"method\": \"ZDHHC17 siRNA knockdown in zebrafish (motor behavior, immunolabeling of axons), siRNA in NSCs and PC12 cells, co-immunoprecipitation of TrkA-tubulin, ERK1/2 phosphorylation western blot, overexpression experiments\",\n      \"journal\": \"Molecular and cellular neurosciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — loss-of-function in zebrafish with morphological readout, Co-IP for complex, single lab, PAT-independence not confirmed by mutagenesis in full\",\n      \"pmids\": [\"26232532\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Adult-specific deletion of Hip14 (ZDHHC17) in mice leads to rapid progressive paralysis and death within 10 weeks, accompanied by striatal synaptic deficits (reduced transmitter release probability, altered spontaneous postsynaptic currents), behavioral deficits, and cortical microgliosis/astrogliosis, demonstrating that HIP14 is essential for maintenance of neuronal integrity and life in the adult.\",\n      \"method\": \"Inducible conditional knockout (iHip14Δ/Δ) mice, electrophysiology (striatal synaptic recordings), behavioral tests, brain histology/immunohistochemistry\",\n      \"journal\": \"BMC biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — inducible conditional knockout with electrophysiological, behavioral, and histological endpoints, distinguishes developmental from adult function\",\n      \"pmids\": [\"27927242\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Using peptide arrays based on SNAP25 and CSPα zDHHC AR-binding motifs (zDABM), a position-specific scoring matrix was derived for zDHHC17 AR binding, predicting and validating 90 human proteins as putative zDHHC17 interactors via their zDABM sequences, including all SNAP25, sprouty, cornifelin, ankyrin, and SLAIN-motif family members.\",\n      \"method\": \"Peptide array binding assays (400 peptides), PSSM construction, in vitro binding validation of predicted interactors\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — systematic peptide array with bioinformatic validation, single lab, interaction confirmed biochemically for subset\",\n      \"pmids\": [\"28882895\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"ZDHHC17 interacts with MAP2K4 and p38/JNK to form a signaling module that activates JNK and p38 MAPK pathways, promoting GBM cell tumorigenicity and glioma stem cell self-renewal. Co-immunoprecipitation and GST pulldown confirmed the ZDHHC17-MAP2K4 interaction. A small molecule genistein disrupts ZDHHC17-MAP2K4 complex formation.\",\n      \"method\": \"Co-immunoprecipitation, GST pulldown, pharmacological inhibition (genistein), in vitro and in vivo tumor models, flow cytometry, transwell migration assay\",\n      \"journal\": \"Theranostics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — reciprocal Co-IP and GST pulldown with functional phenotype, single lab, pathway placement by pharmacological disruption\",\n      \"pmids\": [\"31938047\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"ZDHHC17-dependent palmitoylation of DLK enables DLK-dependent somal degeneration after optic nerve crush (ONC), while ZDHHC17-dependent palmitoylation of NMNAT2 maintains distal axon integrity in healthy optic nerves. Conserved zDABM motifs in both DLK and NMNAT2 govern their ZDHHC17-dependent regulation. ZDHHC17 thus couples two previously considered independent pathways of somal and distal axon degeneration.\",\n      \"method\": \"Optic nerve crush in conditional ZDHHC17 knockout mice/RGCs, palmitoylation assays, motif mutagenesis, DRG neuron loss-of-function experiments\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional KO with two independent substrates, motif mutagenesis, and distinct anatomical readouts (soma vs. distal axon), multiple cell types\",\n      \"pmids\": [\"33207199\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"ZDHHC17 is required as a host factor for SADS-CoV genomic RNA replication. The DHHC domain (palmitoylation-active domain) of ZDHHC17 is specifically required for this function, as truncation mutagenesis removing the DHHC domain abolished virus-supporting activity. The palmitoylation inhibitor 2-bromopalmitate suppresses SADS-CoV infection.\",\n      \"method\": \"Genome-wide CRISPR knockout screen (HeLa cells), truncation mutagenesis of ZDHHC17, viral replication assays, 2-bromopalmitate pharmacological inhibition\",\n      \"journal\": \"mBio\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — CRISPR KO plus truncation mutagenesis in viral infection context, single lab, mechanism only partially resolved (palmitoylation required but direct viral substrate not identified)\",\n      \"pmids\": [\"34700373\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"zDHHC17 can S-acylate Sprouty-2 (Spry2) and SPRED3 via zDABM-independent mechanisms in addition to zDABM-dependent binding. The cysteine-rich SPR domain of SPRED3 (and Spry2) interacts with zDHHC17 independently of the ankyrin repeat domain, revealing a novel mode of enzyme-substrate recognition.\",\n      \"method\": \"Mutational analysis of zDABM and SPR domains, Co-IP, in vitro S-acylation assays, zDHHC17 ANK-deletion mutant binding experiments\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — systematic mutagenesis with both in vitro S-acylation assays and binding experiments, multiple mutant constructs, single lab but multiple orthogonal methods\",\n      \"pmids\": [\"36442513\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"ZDHHC17 is the major palmitoyl acyltransferase responsible for HSP90α palmitoylation in granulosa cells. ZDHHC17-mediated palmitoylation of HSP90α is required for CYP19A1 (aromatase) expression and androgen-to-estrogen conversion. Loss of ZDHHC17 reduces HSP90α palmitoylation, decreases CYP19A1 levels, and impairs estrogen production.\",\n      \"method\": \"siRNA knockdown of ZDHHC17 in granulosa cells, resin-assisted capture palmitoylation assay, CYP19A1 expression analysis, hormone measurement, in vivo PCOS model\",\n      \"journal\": \"Molecular and cellular endocrinology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — loss-of-function with palmitoylation assay and functional downstream readout (CYP19A1/estrogen), single lab\",\n      \"pmids\": [\"37769867\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"zDHHC17 S-palmitoylates Smad7 at Cys202, Cys225, Cys415, and Cys417 in mammary epithelial cells. Palmitoylation at Cys415 and Cys417 promotes nuclear-to-cytoplasmic translocation of Smad7, enhances Smad7 protein stability, and enforces its inhibitory effect on TGF-β-induced Smad transcriptional responses.\",\n      \"method\": \"Resin-assisted capture (RAC) and metabolic palmitoylation labeling, site-directed mutagenesis of Smad7 cysteine residues, subcellular fractionation, TGF-β/Smad transcriptional reporter assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — direct palmitoylation assay with cysteine mutagenesis, subcellular localization experiment tied to functional TGF-β signaling outcome, multiple orthogonal methods\",\n      \"pmids\": [\"38876303\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"ZDHHC17 palmitoylates CDK4, and this palmitoylation facilitates CDK4 interaction with cyclin D1. CDK4 palmitoylation depends on TRAF6-mediated K11-linked ubiquitination of CDK4. Blockade of either CDK4 palmitoylation or ubiquitination markedly reduces CDK4 kinase activity and causes cell cycle arrest. ZDHHC17 depletion reduces cell cycle progression and immune response in a high-fat-diet mouse model.\",\n      \"method\": \"2-BP palmitoylation inhibition, ZDHHC17 siRNA/depletion, Co-IP (CDK4-cyclin D1), ubiquitination assays (K11-linkage specificity), CDK4 kinase activity assay, in vivo mouse model\",\n      \"journal\": \"Advanced science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP, kinase assay, and ubiquitination assay in single lab, functional cell cycle readout; preprint-grade peer review status uncertain for 2026 publication\",\n      \"pmids\": [\"42133178\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Drosophila Hip14 (ortholog of ZDHHC17) acts as a rate-limiting factor for lysosome formation and secretory granule-lysosome fusion, lysosomal acidification, and biosynthetic transport of lysosomal hydrolases in larval salivary glands and neurons. Hip14 overexpression accelerates these processes, and Hip14 loss in adult neurons impairs lysosome formation and neuromuscular function. Rab2 GTPase hyperactivation rescues lysosomal and neuronal defects caused by Hip14 or Patsas (HIP14L ortholog) loss.\",\n      \"method\": \"Drosophila Hip14 and patsas mutants/RNAi, larval salivary gland and neuron imaging, lysosomal acidification assays, hydrolase trafficking assays, genetic epistasis with constitutively active Rab2\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Drosophila ortholog with genetic epistasis (Rab2 rescue), multiple cellular readouts, single preprint lab, not yet peer-reviewed\",\n      \"pmids\": [\"bio_10.1101_2025.02.06.636816\"],\n      \"is_preprint\": true\n    }\n  ],\n  \"current_model\": \"ZDHHC17 (HIP14) is a Golgi-localized palmitoyl acyltransferase whose DHHC catalytic domain and N-terminal ankyrin repeat domain cooperate to recruit and S-acylate a large set of neuronal and non-neuronal substrates (including huntingtin, SNAP-25, PSD-95, GAD65, NMNAT2, DLK, CDK4, Smad7, and HSP90α) via recognition of a conserved zDABM motif or, for some substrates (Sprouty/SPRED family), through the SPR domain in a zDABM-independent manner; wild-type huntingtin in turn modulates HIP14's own palmitoylation and enzymatic activity, and loss of HIP14 function—whether by constitutive knockout, adult-specific deletion, or impairment by mutant huntingtin—causes progressive synaptic dysfunction, neurodegeneration, and lethality associated with reduced palmitoylation of its substrate pool.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"ZDHHC17 (HIP14) is a Golgi- and vesicle-localized DHHC palmitoyl acyltransferase that S-acylates a broad set of neuronal and non-neuronal substrates, coupling protein palmitoylation to intracellular trafficking, synaptic function, and signaling [#0, #1]. It recognizes many substrates through its N-terminal ankyrin repeat (AR) domain, which binds a conserved zDHHC AR-binding motif (zDABM, consensus [VIAP][VIT]XXQP) present in SNAP25, cysteine string protein, huntingtin, MAP6, and dozens of other predicted interactors, recruiting them prior to S-acylation by the DHHC catalytic domain [#9, #12]; for the Sprouty/SPRED family it engages substrates through their cysteine-rich SPR domain in a zDABM- and AR-independent manner [#16]. Validated substrates include SNAP-25, PSD-95, GAD65, synaptotagmin I, and huntingtin (palmitoylated at Cys214) [#0, #2], as well as GPM6A, SPRED1/SPRED3, the axonal regulators DLK and NMNAT2, HSP90\\u03b1, Smad7, and CDK4 [#8, #14, #17, #18, #19]. Its enzymatic output is reciprocally tuned by huntingtin: wild-type HTT is both a substrate and a potentiator of HIP14-mediated palmitoylation, and polyglutamine-expanded HTT reduces HTT\\u2013HIP14 interaction and impairs HIP14 activity in vivo [#2, #4, #5, #7]. Loss of HIP14 function\\u2014by constitutive knockout, adult-specific deletion, or mutant-HTT impairment\\u2014reduces substrate palmitoylation and causes progressive synaptic dysfunction, neurodegeneration, paralysis, and lethality, establishing this single PAT as non-redundant for synaptic plasticity and adult neuronal maintenance [#5, #6, #11]. Beyond the nervous system, ZDHHC17 supports diverse cellular programs through substrate palmitoylation, including MAPK signaling in glioma, HSP90\\u03b1/aromatase-dependent estrogen synthesis, TGF-\\u03b2 regulation via Smad7, CDK4-driven cell cycle progression, and SADS-CoV RNA replication [#13, #14, #17, #18, #19, #15].\",\n  \"teleology\": [\n    {\n      \"year\": 2002,\n      \"claim\": \"Established HIP14 as a huntingtin-interacting protein with a defined subcellular home and a conserved trafficking function, anchoring later mechanistic work.\",\n      \"evidence\": \"Yeast two-hybrid, Golgi co-localization, and rescue of akr1\\u0394 yeast trafficking/endocytosis defects\",\n      \"pmids\": [\"12393793\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Enzymatic activity not yet demonstrated at this stage\", \"Molecular basis of polyglutamine-sensitive interaction unresolved\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Defined HIP14 as a substrate-selective neuronal palmitoyl acyltransferase, answering whether it is an enzyme and which proteins it modifies.\",\n      \"evidence\": \"In vitro palmitoylation assays with multiple substrates plus siRNA knockdown showing reduced PSD-95/GAD65 clustering in neurons\",\n      \"pmids\": [\"15603740\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Substrate recognition mechanism not yet defined\", \"Catalytic residue requirements not mapped\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Identified huntingtin Cys214 as a specific HIP14 palmitoylation site whose modification controls htt trafficking and toxicity, linking enzyme activity to disease.\",\n      \"evidence\": \"Metabolic labeling, Cys214 mutagenesis, knockdown/overexpression, and inclusion quantification in mouse neurons\",\n      \"pmids\": [\"16699508\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether reduced htt palmitoylation is causal in vivo not yet tested\", \"Effect on broader substrate pool unaddressed\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Proposed an unexpected Mg2+ transport function regulated by autopalmitoylation, raising the possibility of activity beyond classical PAT chemistry.\",\n      \"evidence\": \"Xenopus oocyte electrophysiology with DHHC deletion and 2-bromopalmitate inhibition\",\n      \"pmids\": [\"18794299\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Palmitoylation not directly measured\", \"Single lab, not independently confirmed\", \"Physiological relevance of Mg2+ transport unestablished\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Showed bidirectional regulation between HTT and HIP14 and demonstrated in vivo that reduced or mutant HTT lowers HIP14 activity, framing palmitoylation deficits as a Huntington disease mechanism.\",\n      \"evidence\": \"In vitro palmitoylation assays, HTT-ASO knockdown and hdh+/- brain biochemistry, plus Hip14 gene-trap knockout and YAC128 comparison with behavioral/neuropathological endpoints\",\n      \"pmids\": [\"21636527\", \"21775500\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which mutant HTT impairs HIP14 catalysis not resolved\", \"Relative contribution of individual substrates to phenotype unclear\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Demonstrated that a single PAT has non-redundant roles in synaptic plasticity and memory, ruling out full compensation by other DHHC enzymes.\",\n      \"evidence\": \"Hip14 knockout mouse electrophysiology (LTP) and hippocampus-dependent memory tasks\",\n      \"pmids\": [\"24277827\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Causal substrates underlying plasticity deficit not identified\", \"Developmental vs ongoing requirement not separated here\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Mapped the AR domain as the huntingtin-binding region and expanded the substrate/interactor set, beginning to define recognition rules.\",\n      \"evidence\": \"Co-IP deletion mapping of HTT, plus Y2H screen with acyl-RAC validation of GPM6A, SPRED1, SPRED3\",\n      \"pmids\": [\"24651384\", \"24705354\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Exact binding motif not yet defined\", \"Distinction between binding and palmitoylation (e.g. optineurin) mechanistically unexplained\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Defined the zDABM linear motif recognized by the AR domain, providing a generalizable substrate-recruitment code, and uncovered a PAT-independent role in TrkA signaling and axon outgrowth.\",\n      \"evidence\": \"Peptide arrays, mutagenesis, and in vitro S-acylation across multiple substrates; zebrafish/PC12 knockdown with TrkA-tubulin Co-IP and ERK1/2 readouts\",\n      \"pmids\": [\"26198635\", \"26232532\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"zDABM-independent recognition modes not yet defined\", \"PAT-independence of ERK signaling not fully confirmed by catalytic-dead mutagenesis\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Separated developmental from adult function, showing HIP14 is continuously required for neuronal integrity and survival in the adult brain.\",\n      \"evidence\": \"Inducible conditional knockout (iHip14\\u0394/\\u0394) mice with striatal electrophysiology, behavior, and histology\",\n      \"pmids\": [\"27927242\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular pathway from substrate hypopalmitoylation to degeneration not delineated\", \"Specific lethal substrate(s) unidentified\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Built a predictive PSSM for AR binding, scaling substrate identification to ~90 candidate human interactors and generalizing the recruitment model.\",\n      \"evidence\": \"Peptide arrays (400 peptides), PSSM construction, and in vitro binding validation of a predicted subset\",\n      \"pmids\": [\"28882895\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Most predicted interactors not validated as palmitoylation substrates\", \"Binding does not guarantee acylation\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Extended ZDHHC17 function to non-neuronal disease (glioma) signaling and to coordinated control of distinct axon degeneration pathways via substrate palmitoylation.\",\n      \"evidence\": \"Co-IP/GST pulldown of MAP2K4 with JNK/p38 readouts in GBM; conditional KO optic nerve crush with DLK and NMNAT2 zDABM mutagenesis\",\n      \"pmids\": [\"31938047\", \"33207199\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"MAP2K4 module placement relies partly on pharmacological disruption\", \"Whether DLK/NMNAT2 effects generalize beyond optic nerve unaddressed\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Revealed a second, AR-independent substrate-recognition mode through the SPR domain of Sprouty/SPRED proteins, broadening the enzyme's engagement repertoire.\",\n      \"evidence\": \"zDABM and SPR domain mutagenesis, Co-IP, and in vitro S-acylation with ANK-deletion constructs\",\n      \"pmids\": [\"36442513\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of SPR-domain recognition unknown\", \"Generality of this mode across other substrates untested\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Demonstrated regulatory palmitoylation of a signaling effector (Smad7), showing site-specific acylation controls localization, stability, and pathway output.\",\n      \"evidence\": \"RAC/metabolic labeling, Smad7 cysteine mutagenesis, subcellular fractionation, and TGF-\\u03b2/Smad reporter assays in mammary epithelial cells\",\n      \"pmids\": [\"38876303\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo relevance to TGF-\\u03b2 biology not shown\", \"Whether AR/zDABM or SPR recognition mediates Smad7 binding unclear\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Connected ZDHHC17 to endocrine function via HSP90\\u03b1 palmitoylation and aromatase-dependent estrogen synthesis.\",\n      \"evidence\": \"siRNA knockdown in granulosa cells, RAC palmitoylation assay, CYP19A1/hormone measurement, and in vivo PCOS model\",\n      \"pmids\": [\"37769867\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct HSP90\\u03b1 palmitoylation site not mapped\", \"Mechanistic link from HSP90\\u03b1 acylation to CYP19A1 expression incomplete\"]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"Linked ZDHHC17 to cell cycle control by palmitoylating CDK4 in coordination with TRAF6-mediated ubiquitination to promote cyclin D1 binding and kinase activity.\",\n      \"evidence\": \"2-BP inhibition, depletion, CDK4-cyclin D1 Co-IP, K11-ubiquitination and kinase assays, and a high-fat-diet mouse model\",\n      \"pmids\": [\"42133178\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"CDK4 palmitoylation site not defined\", \"Crosstalk mechanism between palmitoylation and K11 ubiquitination unresolved\", \"Single lab\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Extended a conserved role to lysosome biogenesis and secretory granule-lysosome fusion, placing Hip14 upstream of Rab2-dependent membrane trafficking.\",\n      \"evidence\": \"Drosophila Hip14/patsas mutants and RNAi with lysosomal imaging, hydrolase trafficking assays, and Rab2 genetic epistasis (preprint)\",\n      \"pmids\": [\"bio_10.1101_2025.02.06.636816\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Not yet peer-reviewed\", \"Mammalian conservation of the lysosomal role untested\", \"Direct palmitoylation substrate driving Rab2 effect unidentified\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How ZDHHC17 substrate selection, catalytic turnover, and HTT-dependent activity modulation are structurally integrated\\u2014and which specific substrate hypopalmitoylation events drive neurodegeneration\\u2014remains unresolved.\",\n      \"evidence\": \"No structural model or in vivo substrate-attribution experiment in the timeline addresses this\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No structure of the AR-DHHC enzyme with substrate\", \"Causal substrate(s) for lethality/neurodegeneration not pinpointed\", \"Mechanism of mutant-HTT impairment of catalysis unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [0, 2, 4, 9, 14, 16, 17, 18, 19]},\n      {\"term_id\": \"GO:0016740\", \"supporting_discovery_ids\": [0, 9, 18]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [9, 12, 16]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005794\", \"supporting_discovery_ids\": [1, 3]},\n      {\"term_id\": \"GO:0031410\", \"supporting_discovery_ids\": [1, 3]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [0, 9, 18]},\n      {\"term_id\": \"R-HSA-112316\", \"supporting_discovery_ids\": [0, 6, 11, 14]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [13, 18, 10]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"HTT\", \"SNAP25\", \"SPRED1\", \"SPRED3\", \"MAP2K4\", \"DLK\", \"CDK4\", \"HSP90AA1\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}