{"gene":"SLC1A1","run_date":"2026-06-10T07:46:32","timeline":{"discoveries":[{"year":2001,"finding":"GTRAP3-18 specifically interacts with the carboxy-terminal intracellular domain of EAAC1/SLC1A1; overexpression of GTRAP3-18 reduces EAAC1-mediated glutamate transport by lowering substrate affinity without affecting total transporter expression. GTRAP3-18 expression can be upregulated by retinoic acid, producing a specific reduction in EAAC1-mediated transport.","method":"Co-immunoprecipitation, pulldown mapping of C-terminal domain interaction, glutamate uptake assays in cells with overexpressed GTRAP3-18, retinoic acid treatment","journal":"Nature","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal protein interaction mapping, functional transport assays, domain mapping, replicated in multiple subsequent studies","pmids":["11242046"],"is_preprint":false},{"year":1996,"finding":"Activation of protein kinase C (PKC) by phorbol ester (PMA) rapidly increases EAAC1-mediated glutamate transport activity in C6 glioma cells via a 2.5-fold increase in Vmax with no change in Km, independent of protein synthesis. An inactive phorbol ester and the PKC inhibitor chelerythrine block this effect.","method":"Radiolabeled glutamate uptake assays, kinetic analysis, pharmacological inhibitors (chelerythrine, cycloheximide), inactive phorbol ester controls","journal":"Journal of neurochemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean pharmacological dissection with multiple controls, replicated in subsequent studies","pmids":["8764574"],"is_preprint":false},{"year":2000,"finding":"Platelet-derived growth factor (PDGF) rapidly increases EAAC1 activity and cell surface expression via activation of phosphatidylinositol 3-kinase (PI3K). PDGF causes redistribution of EAAC1 from an intracellular compartment to the plasma membrane; this effect is blocked by PI3K inhibitors wortmannin and LY294002 but not by a PKC inhibitor.","method":"Membrane-impermeant biotinylation combined with Western blotting to measure surface EAAC1, radiolabeled glutamate uptake, PI3K activity assay, pharmacological inhibitors","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — biotinylation of surface protein, PI3K activity directly measured, multiple inhibitors used, replicated in subsequent studies","pmids":["10671571"],"is_preprint":false},{"year":2003,"finding":"PKC activation with PMA induces formation of EAAC1-PKCα complexes but not EAAC1-PKCδ complexes in C6 glioma cells, and causes EAAC1 and PKCα to colocalize in clusters at or near the cell surface. EAAC1-PKCα complexes are also detected in rat brain synaptosomes. This interaction is blocked by PKC inhibitors.","method":"Co-immunoprecipitation in C6 glioma and synaptosomes, confocal microscopy colocalization, pharmacological inhibitors","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal co-IP in two systems (cells and synaptosomes), confocal colocalization, inhibitor controls","pmids":["12843260"],"is_preprint":false},{"year":2002,"finding":"PKCα mediates the PKC-dependent increase in EAAC1 cell surface expression, while PKCε mediates an increase in EAAC1 transport activity independent of changes in surface expression (increased Vmax without surface redistribution). Gö6976 (PKCα inhibitor) completely blocks surface expression increase but only partially attenuates activity increase; PKC subtype-selective downregulation confirms this dissociation.","method":"PKC subtype identification by Western blot, selective inhibitor Gö6976, PKC downregulation by prolonged phorbol ester treatment, biotinylation assay, uptake assays","journal":"Molecular pharmacology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal approaches (pharmacological inhibition, PKC downregulation, biotinylation, transport assays) in single lab","pmids":["12237337"],"is_preprint":false},{"year":2004,"finding":"EAAC1 has a half-life of approximately 5–7 min at the plasma membrane due to rapid constitutive recycling. Both PKC (phorbol ester) and PDGF accelerate delivery of EAAC1 to the cell surface; PKC additionally inhibits endocytosis of EAAC1, whereas PDGF does not. Basal and regulated pools of EAAC1 exist in distinct intracellular compartments, as incubation at 18°C blocks regulated but not basal trafficking.","method":"Multiple biotinylation strategies (surface labeling at 37°C, reversible biotinylation to measure internalization), temperature block experiments in C6 glioma and primary neuronal cultures","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal biotinylation methods, temperature block, two cell systems","pmids":["15197183"],"is_preprint":false},{"year":2005,"finding":"A carboxyl-terminal motif (502)YVN(504) in EAAC1 is required for both PDGF-dependent and PKC-dependent regulated trafficking to the cell surface. A 12-amino acid sequence starting at this tyrosine is sufficient to confer PDGF-responsiveness to a non-responsive chimera. The glial transporter GLT-1 carboxyl terminus does not confer regulated trafficking, but replacing it with EAAC1's carboxyl terminus does.","method":"Domain chimeras between EAAC1 and GLT-1, alanine substitution mutagenesis, truncation mutants, biotinylation surface expression assays in C6 glioma","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — mutagenesis with chimeras, alanine scanning, functional trafficking readout; single lab but rigorous domain mapping","pmids":["16368696"],"is_preprint":false},{"year":2005,"finding":"Akt (PKB) is required downstream of PI3K for PDGF-induced redistribution and increased surface expression of EAAC1. A dominant-negative Akt-1 blocks PDGF-induced EAAC1 redistribution; constitutively active Akt-1 increases EAAC1 surface expression; lentiviral CA-Akt-1 increases both surface EAAC1 and Na+-dependent glutamate transport activity.","method":"Dominant-negative and constitutively active Akt-1 transfection, lentiviral expression of CA-Akt, biotinylation surface expression assay, glutamate uptake assay, Akt phosphorylation (Ser473) measurement","journal":"Neuropharmacology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — dominant-negative and gain-of-function approaches, lentiviral vector, multiple functional readouts","pmids":["16182322"],"is_preprint":false},{"year":2005,"finding":"Individual subunits within the EAAC1 homotrimer function independently of each other. Coexpression of EAAC1(WT) with EAAC1(R446Q) (transports glutamine not glutamate) produces purely additive anion currents. Coexpression with EAAC1(H295K) (90-fold reduced glutamate affinity) yields two independent populations matching individual subunit affinities. pH-dependence studies with EAAC1(E373Q) similarly show independent subunit function.","method":"Electrophysiology (anion currents), coexpression of WT and mutant subunits in cells, glutamate concentration-response curves, pH-dependence assays","journal":"Biochemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro functional reconstitution with multiple mutant combinations, electrophysiological assays, converging evidence from three independent mutant pairs","pmids":["16128593"],"is_preprint":false},{"year":2007,"finding":"RTN2B, a reticulon protein localized in the ER and ER exit sites, interacts with EAAC1 and with GTRAP3-18, binding to different regions of RTN2B. RTN2B enhances ER exit and cell surface expression of EAAC1 in heterologous cells. siRNA knockdown of RTN2B decreases EAAC1 protein levels in neurons. Thus RTN2B acts as a positive regulator of EAAC1 trafficking from ER to cell surface, counteracting GTRAP3-18.","method":"Co-immunoprecipitation of RTN2B with EAAC1 and GTRAP3-18, domain binding analysis, surface expression assays in heterologous cells, siRNA knockdown in neurons, Western blotting","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal co-IP, domain mapping, siRNA functional rescue, surface expression measurement","pmids":["18096700"],"is_preprint":false},{"year":2006,"finding":"Syntaxin 1A promotes endocytic sorting of EAAC1 via clathrin-mediated internalization, leading to functional inhibition of glutamate transport. The H3 coiled-coil domain of syntaxin 1A (in the presence of its transmembrane domain) is necessary and sufficient for this inhibitory effect. Endogenous syntaxin 1A knockdown blocks EAAC1 endocytic sorting and lysosomal degradation triggered by kainic acid.","method":"Clathrin-mediated endocytosis assays, syntaxin 1A domain deletion constructs, co-immunoprecipitation, siRNA knockdown in rat model, glutamate transport functional assay","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 2 / Moderate — domain deletion mapping, siRNA knockdown with functional readout, endocytosis pathway characterization","pmids":["16959903"],"is_preprint":false},{"year":2006,"finding":"A dominant-negative variant of SNAP-23 (lacking the SNARE domain) decreases EAAC1 surface expression and slows constitutive delivery of EAAC1 to the plasma membrane. C6 glioma expresses syntaxin 4, VAMP2, and SNAP-23 but not syntaxin 1A, VAMP1, or SNAP-25, indicating that SNAP-23-containing SNARE complexes (not syntaxin 1A) are required for constitutive EAAC1 recycling.","method":"Western blotting of SNARE proteins, co-transfection with dominant-negative SNAP-23, biotinylation surface expression assay, rate-of-delivery assay, Myc-tagged EAAC1","journal":"Neurochemistry international","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — dominant-negative approach with surface expression readout, single lab, single method for the key claim","pmids":["16516346"],"is_preprint":false},{"year":2002,"finding":"Activation of the Gq/11-coupled neurotensin receptor NTS1 rapidly increases EAAC1-mediated aspartate uptake (~70%) in C6 glioma by increasing cell surface expression of EAAC1 via a cytoskeleton-dependent mechanism. Cytochalasin D and colchicine (actin and microtubule disruptors) block this effect, whereas PKC and PI3K inhibitors do not.","method":"Radiolabeled D-aspartate uptake assay, stable NTS1-expressing C6 glioma, cytoskeletal inhibitors (cytochalasin D, colchicine), PKC and PI3K inhibitor controls","journal":"FEBS letters","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — functional trafficking assay with pharmacological dissection, single lab, single method for surface expression change","pmids":["12123836"],"is_preprint":false},{"year":2010,"finding":"In Huntington's disease knock-in neurons, mutant huntingtin causes defective Rab11-dependent recycling endosome trafficking, leading to reduced cell surface levels of EAAC1 and impaired cysteine uptake. Expression of dominant-active Rab11 in HD neurons restores EAAC1 surface expression, cysteine uptake, intracellular glutathione, ROS clearance, and neuronal survival.","method":"Cell surface biotinylation, cysteine uptake assays, glutathione measurement, ROS assays, dominant-active Rab11 rescue in primary HD neurons from HD140Q/140Q knock-in mice","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (biotinylation, uptake, GSH, ROS, survival), dominant-active rescue, primary neuronal culture model","pmids":["20357106"],"is_preprint":false},{"year":2010,"finding":"Loss of EAAC1 (EAAC1-/- mice) impairs neuronal cysteine uptake, reduces glutathione synthesis, increases cytosolic and vesicular zinc, and exacerbates hippocampal neuronal death after transient cerebral ischemia (~2-fold). N-acetylcysteine treatment restores glutathione, normalizes zinc levels, and reduces ischemia-induced zinc translocation, superoxide production, and neuronal death.","method":"EAAC1 knockout mouse model, transient cerebral ischemia model, histological neuronal death quantification, zinc fluorescence, superoxide detection, NAC pharmacological rescue","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Moderate — clean genetic KO with defined mechanistic pathway (cysteine→GSH→zinc buffering), pharmacological rescue with NAC confirming mechanism","pmids":["21084597"],"is_preprint":false},{"year":2010,"finding":"Loss-of-function mutations R445W and I395del in SLC1A1 impede or abolish glutamate and cysteine transport, and lead to near-absent surface expression in a kidney cell line, causing human dicarboxylic aminoaciduria. This establishes SLC1A1 as the major renal transporter of glutamate and aspartate in humans.","method":"Transport assays in kidney cell line expressing mutant SLC1A1, surface expression assays, identification of R445W and I395del mutations in human patients with dicarboxylic aminoaciduria","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 1 / Moderate — functional mutagenesis (transport assays + surface expression), disease-linked mutations, human genetic validation","pmids":["21123949"],"is_preprint":false},{"year":2004,"finding":"SGK1 (serum- and glucocorticoid-inducible kinase 1) co-localizes with EAAT3 in retinal ganglion cells and stimulates EAAT3-mediated glutamate transport when co-expressed in Xenopus oocytes. Constitutively active SGK1 (S422D) and constitutively active PKB stimulate transport, whereas inactive SGK1 (K127N) does not.","method":"Immunohistochemistry for colocalization, Xenopus oocyte expression with dual electrode voltage clamp, constitutively active and dominant-negative SGK1 and PKB constructs","journal":"Investigative ophthalmology & visual science","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — electrophysiology in Xenopus oocytes with gain-of-function and loss-of-function constructs, colocalization supporting biological relevance; single lab","pmids":["15111600"],"is_preprint":false},{"year":2006,"finding":"EAAC1 has a unique anti-apoptotic function independent of glutamate removal: during apoptotic stimuli, holocytochrome c synthetase (HCCS) translocates from mitochondria and suppresses XIAP (activating caspase-3). The N-terminus of EAAC1 binds HCCS, interfering with the HCCS-XIAP interaction and thereby maintaining XIAP activity and inhibiting caspase-3. This mechanism rescues PC12 cells from NGF deprivation and protects motor neurons from nerve injury.","method":"Co-immunoprecipitation of EAAC1 N-terminus with HCCS, binding competition assays (HCCS-XIAP interaction), caspase-3 activity assay, PC12 cell and motor neuron rescue experiments","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 / Moderate — co-IP mapping, competition binding, functional apoptosis assays, in vitro and in vivo neuronal models","pmids":["16858406"],"is_preprint":false},{"year":2007,"finding":"GTRAP3-18 negatively regulates neuronal glutathione synthesis by interacting with EAAC1 at the plasma membrane, reducing cysteine uptake. Increasing GTRAP3-18 at the plasma membrane (via methyl-β-cyclodextrin) decreases GSH and increases oxidative stress vulnerability; decreasing GTRAP3-18 with antisense oligonucleotides increases GSH. PKC-stimulated EAAC1 activity increase is blocked by elevated surface GTRAP3-18.","method":"HEK293 cell model, antisense oligonucleotide knockdown, methyl-β-cyclodextrin to increase surface GTRAP3-18, GSH measurement, oxidative stress assays, PKC activation","journal":"Molecular pharmacology","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal approaches (gain and loss of GTRAP3-18, PKC stimulation), GSH functional readout, consistent with in vivo data from same group","pmids":["17646425"],"is_preprint":false},{"year":2011,"finding":"GTRAP3-18 regulates neuronal glutathione levels in vivo by controlling EAAC1-mediated cysteine uptake. Increased GTRAP3-18 decreases GSH and increases oxidative stress vulnerability in vitro and in vivo; decreased GTRAP3-18 increases GSH levels in vitro and in vivo.","method":"In vitro cell culture and in vivo (rodent) experiments, GTRAP3-18 protein level manipulation, GSH measurement, oxidative stress vulnerability assays","journal":"Amino acids","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro and in vivo validation, consistent mechanistic direction; builds on prior studies but abstract less detailed on methods","pmids":["21373771"],"is_preprint":false},{"year":2008,"finding":"ARL6IP1 indirectly promotes EAAC1-mediated glutamate transport by binding directly to addicsin (GTRAP3-18/Arl6ip5), competing for addicsin binding to EAAC1. The hydrophobic region (aa 103-117) of addicsin is crucial for both Arl6ip1-addicsin heterodimer and addicsin homodimer formation. In the presence of PKC activation, ARL6IP1 overexpression increases EAAC1-mediated transport by increasing glutamate affinity (not Vmax). The addicsin Y110A/L112A mutant (lacking Arl6ip1 binding) abolishes this enhancement.","method":"Co-immunoprecipitation, alanine mutagenesis of addicsin binding region, glutamate transport assays, kinetic analysis, PKC activation with PMA","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP domain mapping, mutagenesis, functional transport assays with kinetics; single lab","pmids":["18684713"],"is_preprint":false},{"year":2012,"finding":"EAAC1 is expressed in neuronal and glial mitochondria where it participates in glutamate-stimulated ATP production. EAAC1 physically interacts with the sodium/calcium exchanger NCX1 in mitochondria; NCX1 activity is essential for EAAC1-mediated glutamate-stimulated ATP synthesis. Antisense knockdown of either EAAC1 or NCX1 abolishes this mitochondrial metabolic response.","method":"Western blot, confocal microscopy, immunoelectron microscopy, luciferase-luciferin ATP assay, pharmacological blockers, EAAC1 and NCX1 antisense oligonucleotides, co-immunoprecipitation","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple detection methods for mitochondrial localization, co-IP for physical interaction, antisense knockdown functional assay; single lab, somewhat unexpected finding","pmids":["22479505"],"is_preprint":false},{"year":2019,"finding":"SorCS2 acts as a sorting receptor that sustains EAAC1/EAAT3 cell surface expression to facilitate cysteine import and glutathione synthesis. Lack of SorCS2 depletes EAAT3 from the plasma membrane, impairs neuronal cysteine uptake, causes oxidative brain damage, and increases neuronal death and mortality during epilepsy in SorCS2-deficient mice.","method":"SorCS2-knockout mouse model, EAAT3 surface expression assay, cysteine uptake assay, glutathione measurement, oxidative stress and neuronal death quantification in epilepsy model","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 / Moderate — genetic KO model, surface expression, uptake, and GSH functional readouts, disease-relevant phenotype","pmids":["30840898"],"is_preprint":false},{"year":2017,"finding":"EAAT3/SLC1A1 loss in the midbrain (but not striatum) reduces dopamine release in the dorsal striatum. Slc1a1-STOP mice show reduced extracellular dopamine, impaired locomotor and stereotypic responses to amphetamine, reduced D1 receptor binding in the dorsal striatum, and diminished OCD-like grooming behavior. Viral restoration of EAAT3 in the midbrain (but not striatum) partially rescues these phenotypes, consistent with a presynaptic dopaminergic role for EAAT3.","method":"STOP-cassette conditional knockout mouse, amphetamine locomotor and stereotypy assays, in vivo microdialysis for extracellular dopamine, D1 receptor autoradiography, immediate early gene induction assay, viral vector-mediated regional rescue","journal":"PNAS","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional KO, regional viral rescue, multiple behavioral and neurochemical endpoints, mechanistic pathway placement","pmids":["28507136"],"is_preprint":false},{"year":2018,"finding":"Mice with EAAT3 overexpression driven by CaMKIIα promoter (EAAT3glo/CMKII) display increased anxiety-like and repetitive behaviors, greater fear conditioning, and altered NMDA receptor subunit composition and NMDA-dependent synaptic plasticity at corticostriatal synapses. These behavioral effects are reversed by chronic fluoxetine or clomipramine treatment.","method":"Cre-dependent transgenic overexpression, behavioral assays (anxiety, repetitive behaviors, fear conditioning), electrophysiology at corticostriatal synapses, NMDA subunit biochemical analysis, pharmacological rescue","journal":"Neuropsychopharmacology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — transgenic gain-of-function model, behavioral, electrophysiological, and biochemical endpoints, pharmacological validation","pmids":["30622300"],"is_preprint":false},{"year":2001,"finding":"PKC activation by phorbol ester inhibits EAAC1 in Xenopus oocytes by promoting its retrieval from the plasma membrane, reducing Imax with no change in Km. PMA simultaneously decreased membrane capacitance and increased cytosolic EAAC1 accumulation. This effect is PKC-mediated (blocked by PKC inhibitors; inactive 4α-PDD has no effect). Notably, this is opposite to the stimulatory PKC effect seen in C6 glioma cells, demonstrating cell-type specificity of PKC regulation.","method":"Xenopus oocyte expression system, [3H]L-glutamate uptake, dual electrode voltage clamp, PKC inhibitors, membrane capacitance measurement, EAAC1 protein localization","journal":"Brain research","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — Xenopus oocyte electrophysiology with inhibitor controls; cell-type specific effect noted but mechanistic basis not fully resolved","pmids":["11578612"],"is_preprint":false},{"year":2009,"finding":"Wild-type PIP5K2A (phosphatidylinositol-4-phosphate 5-kinase IIα) increases EAAT3 transport activity and membrane abundance in Xenopus oocytes and HEK cells. The schizophrenia-associated mutant (N251S)PIP5K2A exerts a dominant inhibitory effect, decreasing EAAT3 membrane abundance and transport activity, even in the presence of wild-type PIP5K2A.","method":"Xenopus oocyte co-expression, dual electrode voltage clamp, confocal microscopy, chemiluminescence membrane protein quantification in HEK cells","journal":"Psychopharmacology","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — electrophysiology and surface expression in two systems, dominant-negative disease mutant; single lab","pmids":["19644675"],"is_preprint":false},{"year":2010,"finding":"AMP-activated protein kinase (AMPK) downregulates EAAT3 (and EAAT4) by reducing their membrane abundance. Constitutively active AMPK (γR70Q) or wild-type AMPK co-expressed with EAAT3 in Xenopus oocytes significantly decreases maximal glutamate-induced current (Ig) without changing Km; inactive AMPK (αK45R) has no effect.","method":"Xenopus oocyte expression, dual electrode voltage clamp, confocal microscopy for membrane abundance, Western blotting","journal":"Journal of neurochemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — electrophysiology with active/inactive kinase constructs, surface expression confirmed by confocal; single lab","pmids":["20218975"],"is_preprint":false},{"year":2012,"finding":"mTOR coexpression significantly increases EAAT3 transport activity (glutamate-induced current) and EAAT3 membrane protein abundance in Xenopus oocytes; this effect is reversed by rapamycin (100 nM). The decay of transport current after brefeldin A treatment is similar with and without rapamycin, suggesting mTOR regulates delivery rather than retrieval of EAAT3.","method":"Xenopus oocyte co-expression, dual electrode voltage clamp, rapamycin pharmacology, brefeldin A carrier insertion block, chemiluminescence for membrane protein quantification","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — electrophysiology with pharmacological controls in Xenopus oocytes; single lab, single expression system","pmids":["22483750"],"is_preprint":false},{"year":2013,"finding":"Three alternative SLC1A1/EAAC1 mRNA isoforms (P2 internal promoter transcript, ex2skip lacking exon 2, ex11skip lacking exon 11) all inhibit glutamate uptake by the full-length EAAC1 transporter. Ex2skip and ex11skip isoforms partially colocalize with and physically interact with the full-length EAAC1 protein.","method":"Isoform cloning, co-immunoprecipitation, colocalization studies, glutamate uptake inhibition assays","journal":"Translational psychiatry","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — co-IP and functional inhibition assays; single lab, no domain-level mechanistic resolution","pmids":["23695234"],"is_preprint":false},{"year":1997,"finding":"EAAC1 protein is localized on the luminal (apical) membrane of S2 and S3 segments of proximal renal tubules, consistent with a role as the apical high-affinity glutamate transporter mediating reabsorption of acidic amino acids in the kidney beyond early S1 segments.","method":"In situ hybridization, immunofluorescence microscopy with anti-EAAC1 antibodies, Western blotting of kidney cortex and medulla fractions","journal":"The American journal of physiology","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — direct immunolocalization with biochemical fractionation; replicated by clinical mutation studies; no functional transport measurement in situ","pmids":["9435692"],"is_preprint":false},{"year":2000,"finding":"EAAC1 is localized perisynaptically (outside the synaptic specialization) in dendritic membranes and cytoplasm of hippocampal neurons, with membrane-associated EAAC1 not intermingled with GluR2 within the synaptic complex. A significant presynaptic pool of EAAC1 also exists. EAAC1 is not at the postsynaptic density but is ideally positioned to regulate perisynaptic and presynaptic glutamate levels.","method":"Pre-embedding immunoelectron microscopy, post-embedding double-label immunogold localization, EAAC1 vs. GluR2 spatial mapping in rat hippocampus","journal":"The Journal of comparative neurology","confidence":"Medium","confidence_rationale":"Tier 3 / Strong — high-resolution immunoelectron microscopy, double-label quantification, replicated by multiple labs","pmids":["10701825"],"is_preprint":false},{"year":2020,"finding":"SLC1A1 actively recycles extracellular glutamate into lung cancer cells, which enhances the efficiency of cystine uptake via the cystine/glutamate antiporter Xc- and promotes glutathione biosynthesis. Depletion of SLC1A1 increases extracellular glutamate, inhibits cystine uptake, blocks GSH synthesis, and induces oxidative stress-mediated cell death. This is demonstrated by stable isotope-assisted metabolomics.","method":"SLC1A1 knockdown and overexpression, stable isotope-assisted metabolomics (cystine and glutamate flux measurement), extracellular glutamate measurement, GSH quantification, cell death assays","journal":"Cancer research","confidence":"High","confidence_rationale":"Tier 2 / Moderate — isotope tracing metabolomics, gain and loss of function, mechanistic pathway (glutamate recycling→Xc- cystine uptake→GSH) rigorously tested","pmids":["33229341"],"is_preprint":false},{"year":2022,"finding":"SLC1A1, preferentially expressed in vascular endothelial cells, imports oncometabolite R-2-hydroxyglutarate (R-2-HG) from IDH1-mutant tumor microenvironment into endothelial cells and traffics it to mitochondria. R-2-HG via SLC1A1 promotes mitochondrial Na+/Ca2+ exchange, activates the mitochondrial respiratory chain, and fuels endothelial cell migration and tumor angiogenesis. SLC1A1 deficiency in mice abolishes mIDH1-promoted tumor angiogenesis.","method":"SLC1A1-knockout mice, tumor angiogenesis assays, R-2-HG uptake and subcellular fractionation, mitochondrial respiration assays, Ca2+ and Na+ flux measurements, endothelial migration assays","journal":"Cell research","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic KO mouse, cellular transport assays, mitochondrial functional assays, in vivo tumor angiogenesis readout, multiple orthogonal methods","pmids":["35459936"],"is_preprint":false}],"current_model":"SLC1A1/EAAC1 is a Na+-dependent plasma membrane transporter for glutamate, aspartate, and cysteine whose surface expression and activity are tightly controlled by rapid recycling between an intracellular pool and the cell surface; this trafficking is positively regulated by PKCα (via direct complex formation), PDGF→PI3K→Akt signaling, SGK1, mTOR, SorCS2, and RTN2B (ER exit), and negatively regulated by GTRAP3-18 (C-terminal interaction reducing substrate affinity and blocking ER exit), syntaxin 1A (clathrin-mediated endocytosis), AMPK, and a dominant-negative SNAP-23 variant; the C-terminal YVN motif is required for PKC- and PDGF-dependent regulated trafficking; individual subunits within the EAAC1 homotrimer function independently; beyond glutamate clearance, EAAC1 provides neuronal cysteine for glutathione synthesis (critical for antioxidant defense and zinc buffering), possesses an anti-apoptotic function through its N-terminal binding to holocytochrome c synthetase (HCCS) that preserves XIAP activity, and in the midbrain influences presynaptic dopaminergic function and striatal dopamine release; in endothelial cells SLC1A1 additionally imports R-2-hydroxyglutarate and drives tumor angiogenesis via mitochondrial Na+/Ca2+ exchange."},"narrative":{"mechanistic_narrative":"SLC1A1 (EAAC1/EAAT3) is a Na+-dependent, high-affinity plasma membrane transporter for glutamate, aspartate, and cysteine whose activity is governed largely by rapid, regulated trafficking between an intracellular pool and the cell surface, where the protein has a half-life of only ~5–7 minutes due to constitutive recycling [PMID:15197183]. Surface delivery and transport are acutely stimulated through parallel signaling routes: PKC activation increases transport, with PKCα forming direct EAAC1–PKCα complexes that drive surface expression while PKCε raises intrinsic activity [PMID:8764574, PMID:12843260, PMID:12237337], and PDGF acts through PI3K→Akt to redistribute the transporter to the membrane [PMID:10671571, PMID:16182322]; both regulated pathways depend on a C-terminal (502)YVN(504) motif [PMID:16368696]. ER exit and surface stability are set by competing interactions at the cytoplasmic tail—GTRAP3-18 binds the C-terminus to lower substrate affinity and restrain ER export, while RTN2B and ARL6IP1 oppose GTRAP3-18 to promote forward trafficking [PMID:11242046, PMID:18096700, PMID:18684713], and the sorting receptor SorCS2 sustains surface levels [PMID:30840898]; conversely syntaxin 1A drives clathrin-mediated endocytosis and degradation [PMID:16959903]. Functionally, EAAC1 imports cysteine to support neuronal glutathione synthesis and antioxidant/zinc-buffering defense, such that its loss exacerbates ischemic and epileptic neuronal death [PMID:20357106, PMID:21084597, PMID:17646425, PMID:30840898], and the same glutamate-recycling/cysteine-supply logic drives glutathione biosynthesis and survival in cancer cells via cooperation with system Xc- [PMID:33229341]. Independent of transport, the EAAC1 N-terminus binds holocytochrome c synthetase to preserve XIAP activity and confer an anti-apoptotic function [PMID:16858406]. In vivo, EAAC1 controls midbrain presynaptic dopaminergic signaling and OCD-like behaviors [PMID:28507136, PMID:30622300], and loss-of-function mutations cause human dicarboxylic aminoaciduria, establishing it as the major renal acidic-amino-acid transporter [PMID:21123949, PMID:9435692]. A distinct vascular role imports the oncometabolite R-2-hydroxyglutarate into endothelial mitochondria to drive Na+/Ca2+ exchange and tumor angiogenesis [PMID:35459936].","teleology":[{"year":1996,"claim":"Established that EAAC1 transport is acutely regulated by intracellular signaling rather than only by expression level, opening the question of how a kinase changes transporter output.","evidence":"PKC activation by phorbol ester in C6 glioma, with kinetic analysis and PKC inhibitors","pmids":["8764574"],"confidence":"High","gaps":["Did not determine whether increased Vmax reflected more surface transporters or higher per-molecule activity","PKC isoform not identified"]},{"year":2000,"claim":"Showed the regulatory mechanism is trafficking-based, linking growth-factor signaling to physical redistribution of the transporter to the membrane.","evidence":"PDGF stimulation with surface biotinylation, PI3K activity assay, and PI3K inhibitors","pmids":["10671571"],"confidence":"High","gaps":["Downstream effector of PI3K not yet defined","Trafficking step (delivery vs. retrieval) not resolved"]},{"year":2001,"claim":"Identified a direct C-terminal binding partner (GTRAP3-18) that suppresses transport by lowering substrate affinity, defining a protein-interaction mode of regulation distinct from trafficking.","evidence":"Co-IP, C-terminal domain mapping, and glutamate uptake assays with retinoic-acid induction","pmids":["11242046"],"confidence":"High","gaps":["Mechanism by which affinity is lowered not structurally resolved","Whether GTRAP3-18 acts in ER vs. plasma membrane not yet distinguished"]},{"year":2001,"claim":"Revealed cell-type specificity of PKC regulation, showing the same kinase can drive opposite trafficking outcomes.","evidence":"Xenopus oocyte electrophysiology, capacitance measurement, and PKC inhibitors","pmids":["11578612"],"confidence":"Medium","gaps":["Molecular basis for opposite directionality between oocytes and glioma not resolved","Single expression system"]},{"year":2002,"claim":"Defined PKCα vs. PKCε division of labor (surface expression vs. intrinsic activity) and added a Gq-coupled receptor, cytoskeleton-dependent route, broadening the regulatory network.","evidence":"PKC subtype-selective inhibition/downregulation with biotinylation; NTS1-driven aspartate uptake with cytoskeletal disruptors","pmids":["12237337","12123836"],"confidence":"High","gaps":["Substrate(s) phosphorylated by each PKC isoform unknown","How NTS1 couples to cytoskeleton-dependent insertion unresolved"]},{"year":2003,"claim":"Demonstrated PKCα physically complexes with EAAC1, providing a molecular basis for isoform-specific surface regulation in cells and native brain tissue.","evidence":"Reciprocal co-IP in C6 glioma and synaptosomes plus confocal colocalization","pmids":["12843260"],"confidence":"High","gaps":["Direct vs. adaptor-mediated contact not established","Phosphorylation site(s) on EAAC1 not mapped"]},{"year":2004,"claim":"Quantified the rapid constitutive recycling of EAAC1 and separated basal from regulated intracellular pools, clarifying which trafficking step each stimulus controls.","evidence":"Multiple biotinylation/internalization strategies and temperature-block experiments in two cell systems","pmids":["15197183"],"confidence":"High","gaps":["Identity of the regulated intracellular compartment not defined","SNARE/vesicle machinery not yet identified"]},{"year":2004,"claim":"Placed SGK1 (and PKB) as kinases stimulating EAAT3 transport, extending the kinase regulatory network.","evidence":"Xenopus oocyte voltage clamp with active/inactive SGK1 and PKB constructs plus retinal colocalization","pmids":["15111600"],"confidence":"Medium","gaps":["Direct vs. indirect kinase action not established","Trafficking step affected not resolved"]},{"year":2005,"claim":"Identified the cytoplasmic effector and the precise C-terminal motif required for regulated trafficking, and showed homotrimer subunits transport independently.","evidence":"Akt dominant-negative/constitutively-active rescue; EAAC1/GLT-1 chimeras and YVN alanine scanning; coexpression electrophysiology of WT and affinity mutants","pmids":["16182322","16368696","16128593"],"confidence":"High","gaps":["Whether YVN is directly phosphorylated or serves as a binding site unknown","How independent subunit gating relates to regulated trafficking not addressed"]},{"year":2006,"claim":"Resolved the endocytic and exocytic SNARE machinery, showing syntaxin 1A promotes clathrin-mediated removal/degradation while SNAP-23 SNAREs drive constitutive delivery.","evidence":"Syntaxin 1A domain deletions with siRNA knockdown and endocytosis/degradation assays; SNARE profiling with dominant-negative SNAP-23 and rate-of-delivery assays","pmids":["16959903","16516346"],"confidence":"Medium","gaps":["Whether syntaxin 1A binds EAAC1 directly not fully established","Cell-type variation in SNARE usage not reconciled"]},{"year":2006,"claim":"Uncovered a transport-independent anti-apoptotic function: the EAAC1 N-terminus sequesters HCCS to preserve XIAP and block caspase-3.","evidence":"N-terminal co-IP with HCCS, HCCS–XIAP competition binding, caspase-3 assays, and PC12/motor neuron rescue","pmids":["16858406"],"confidence":"High","gaps":["Structural basis of N-terminal HCCS binding not defined","In vivo contribution relative to glutathione function unclear"]},{"year":2007,"claim":"Defined the positive trafficking arm at the ER and at the membrane, with RTN2B promoting ER exit by counteracting GTRAP3-18 and surface GTRAP3-18 controlling cysteine uptake/glutathione.","evidence":"RTN2B co-IP, domain mapping, surface expression and neuronal siRNA; GTRAP3-18 gain/loss with GSH and oxidative-stress readouts","pmids":["18096700","17646425"],"confidence":"High","gaps":["Quantitative balance between GTRAP3-18 and RTN2B at steady state unknown","How retinoic acid couples to oxidative-stress state not detailed"]},{"year":2008,"claim":"Showed ARL6IP1 tunes transport indirectly by competing for GTRAP3-18, adding a regulator-of-regulator layer that raises substrate affinity.","evidence":"Co-IP, addicsin hydrophobic-region mutagenesis, and kinetic transport assays under PKC activation","pmids":["18684713"],"confidence":"Medium","gaps":["In vivo relevance not tested","Single lab, single system"]},{"year":2010,"claim":"Connected EAAC1 trafficking and cysteine supply to disease and stress, showing recycling-endosome defects, knockout, and ischemia converge on glutathione/zinc dysregulation and neuronal death.","evidence":"Rab11 dominant-active rescue in HD knock-in neurons; EAAC1-/- mice in cerebral ischemia with NAC rescue, zinc and superoxide readouts","pmids":["20357106","21084597"],"confidence":"High","gaps":["Relative contribution of cysteine supply vs. glutamate clearance to neuroprotection not separated","Recycling-endosome adaptor for EAAC1 not identified"]},{"year":2010,"claim":"Established SLC1A1 as the major human renal acidic amino-acid transporter through loss-of-function mutations causing dicarboxylic aminoaciduria, and added AMPK and PIP5K2A as regulators.","evidence":"Patient mutations R445W/I395del with transport and surface assays in kidney cells; Xenopus/HEK electrophysiology and surface assays for AMPK and PIP5K2A","pmids":["21123949","20218975","19644675"],"confidence":"High","gaps":["Renal vs. neuronal disease mechanisms not unified","Direct vs. indirect action of AMPK/PIP5K2A on EAAT3 unresolved"]},{"year":2012,"claim":"Added mTOR as a delivery-promoting regulator and described a mitochondrial EAAC1–NCX1 partnership supporting glutamate-stimulated ATP synthesis.","evidence":"Xenopus mTOR coexpression with rapamycin/brefeldin A; mitochondrial localization imaging, EAAC1–NCX1 co-IP, and antisense ATP assays","pmids":["22483750","22479505"],"confidence":"Medium","gaps":["How a plasma-membrane transporter reaches mitochondria not explained","mTOR effect mechanism (direct vs. via Akt/SGK) unresolved"]},{"year":2013,"claim":"Showed alternative SLC1A1 isoforms act as dominant inhibitors of the full-length transporter, adding transcript-level regulation relevant to psychiatric phenotypes.","evidence":"Isoform cloning, co-IP/colocalization, and glutamate-uptake inhibition assays","pmids":["23695234"],"confidence":"Medium","gaps":["Mechanism of dominant-negative inhibition not mapped","Physiological abundance of isoforms unknown"]},{"year":2018,"claim":"Linked EAAT3 dosage to behavior and synaptic physiology in vivo, with midbrain loss reducing striatal dopamine and overexpression producing OCD-like, fluoxetine-reversible phenotypes.","evidence":"STOP-cassette conditional KO with regional viral rescue and microdialysis; CaMKIIα-driven overexpression with behavior, corticostriatal electrophysiology, and drug rescue","pmids":["28507136","30622300"],"confidence":"High","gaps":["Molecular link between transport activity and dopamine release not defined","Whether glutamate clearance or cysteine supply drives behavior unresolved"]},{"year":2019,"claim":"Identified SorCS2 as a sorting receptor sustaining EAAT3 surface levels for cysteine import, with deficiency causing oxidative damage and worse epilepsy outcomes.","evidence":"SorCS2-knockout mice with surface expression, cysteine uptake, GSH, and neuronal death assays in epilepsy","pmids":["30840898"],"confidence":"High","gaps":["Trafficking itinerary controlled by SorCS2 not mapped","Relationship to GTRAP3-18/RTN2B network unexamined"]},{"year":2022,"claim":"Extended SLC1A1 beyond neurons and amino acids, showing endothelial import of the oncometabolite R-2-HG to mitochondria drives Na+/Ca2+ exchange and tumor angiogenesis; and that glutamate recycling fuels cancer glutathione synthesis via system Xc-.","evidence":"SLC1A1-KO mice and endothelial assays with R-2-HG uptake/fractionation and mitochondrial respiration; isotope-tracing metabolomics in lung cancer with knockdown/overexpression","pmids":["35459936","33229341"],"confidence":"High","gaps":["Substrate selectivity allowing R-2-HG transport not structurally defined","Whether mitochondrial localization seen in neurons applies to endothelial cells unresolved"]},{"year":null,"claim":"How the multiple converging regulators (PKC isoforms, PI3K/Akt, SGK1, mTOR, AMPK, GTRAP3-18/RTN2B/ARL6IP1, syntaxin 1A, SNAP-23, SorCS2) are integrated on a single C-terminal/N-terminal interface to set net surface density in a given cell type remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unified structural model of the regulated cytoplasmic interface","Hierarchy and crosstalk among kinase and adaptor pathways not established","Tissue-specific determinants of opposite PKC outcomes unknown"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0005215","term_label":"transporter activity","supporting_discovery_ids":[1,2,8,15,30,32,33]},{"term_id":"GO:0140313","term_label":"molecular sequestering activity","supporting_discovery_ids":[17]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[2,5,30,31]},{"term_id":"GO:0005783","term_label":"endoplasmic reticulum","supporting_discovery_ids":[9]},{"term_id":"GO:0005739","term_label":"mitochondrion","supporting_discovery_ids":[21,33]},{"term_id":"GO:0005768","term_label":"endosome","supporting_discovery_ids":[13]}],"pathway":[{"term_id":"R-HSA-382551","term_label":"Transport of small molecules","supporting_discovery_ids":[2,15,30,32]},{"term_id":"R-HSA-112316","term_label":"Neuronal System","supporting_discovery_ids":[23,24,31]},{"term_id":"R-HSA-9609507","term_label":"Protein localization","supporting_discovery_ids":[5,9,10,22]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[17]},{"term_id":"R-HSA-8953897","term_label":"Cellular responses to stimuli","supporting_discovery_ids":[14,18]}],"complexes":[],"partners":["GTRAP3-18","PRKCA","RTN2B","ARL6IP1","STX1A","SORCS2","HCCS","NCX1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P43005","full_name":"Excitatory amino acid transporter 3","aliases":["Excitatory amino-acid carrier 1","Neuronal and epithelial glutamate transporter","Sodium-dependent glutamate/aspartate transporter 3","Solute carrier family 1 member 1"],"length_aa":524,"mass_kda":57.1,"function":"Sodium-dependent, high-affinity amino acid transporter that mediates the uptake of L-glutamate and also L-aspartate and D-aspartate (PubMed:21123949, PubMed:26690923, PubMed:33658209, PubMed:7521911, PubMed:7914198, PubMed:8857541). Can also transport L-cysteine (PubMed:21123949). Functions as a symporter that transports one amino acid molecule together with two or three Na(+) ions and one proton, in parallel with the counter-transport of one K(+) ion (PubMed:26690923, PubMed:33658209, PubMed:7521911, PubMed:8857541). Mediates Cl(-) flux that is not coupled to amino acid transport; this avoids the accumulation of negative charges due to aspartate and Na(+) symport (PubMed:26690923, PubMed:8857541). Plays an important role in L-glutamate and L-aspartate reabsorption in renal tubuli (PubMed:21123949). Plays a redundant role in the rapid removal of released glutamate from the synaptic cleft, which is essential for terminating the postsynaptic action of glutamate (By similarity). Contributes to glutathione biosynthesis and protection against oxidative stress via its role in L-glutamate and L-cysteine transport (By similarity). Negatively regulated by ARL6IP5 (By similarity)","subcellular_location":"Cell membrane; Apical cell membrane; Synapse, synaptosome; Early endosome membrane; Late endosome membrane; Recycling endosome membrane","url":"https://www.uniprot.org/uniprotkb/P43005/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/SLC1A1","classification":"Not Classified","n_dependent_lines":2,"n_total_lines":1208,"dependency_fraction":0.0016556291390728477},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/SLC1A1","total_profiled":1310},"omim":[{"mim_id":"615232","title":"SCHIZOPHRENIA 18; SCZD18","url":"https://www.omim.org/entry/615232"},{"mim_id":"611608","title":"MICRO RNA 183; MIR183","url":"https://www.omim.org/entry/611608"},{"mim_id":"611607","title":"MICRO RNA 182; MIR182","url":"https://www.omim.org/entry/611607"},{"mim_id":"611606","title":"MICRO RNA 96; MIR96","url":"https://www.omim.org/entry/611606"},{"mim_id":"610438","title":"RESTLESS LEGS SYNDROME, SUSCEPTIBILITY TO, 3; RLS3","url":"https://www.omim.org/entry/610438"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"epididymis","ntpm":42.5},{"tissue":"intestine","ntpm":60.9},{"tissue":"kidney","ntpm":47.6}],"url":"https://www.proteinatlas.org/search/SLC1A1"},"hgnc":{"alias_symbol":["EAAC1","EAAT3","hEAAC1"],"prev_symbol":[]},"alphafold":{"accession":"P43005","domains":[{"cath_id":"1.10.3860.10","chopping":"15-171_202-476","consensus_level":"medium","plddt":88.7575,"start":15,"end":476}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P43005","model_url":"https://alphafold.ebi.ac.uk/files/AF-P43005-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P43005-F1-predicted_aligned_error_v6.png","plddt_mean":80.12},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=SLC1A1","jax_strain_url":"https://www.jax.org/strain/search?query=SLC1A1"},"sequence":{"accession":"P43005","fasta_url":"https://rest.uniprot.org/uniprotkb/P43005.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P43005/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P43005"}},"corpus_meta":[{"pmid":"16818866","id":"PMC_16818866","title":"Glutamate transporter gene SLC1A1 associated with obsessive-compulsive disorder.","date":"2006","source":"Archives of general psychiatry","url":"https://pubmed.ncbi.nlm.nih.gov/16818866","citation_count":236,"is_preprint":false},{"pmid":"11242046","id":"PMC_11242046","title":"Modulation of the neuronal glutamate transporter EAAC1 by the interacting protein GTRAP3-18.","date":"2001","source":"Nature","url":"https://pubmed.ncbi.nlm.nih.gov/11242046","citation_count":187,"is_preprint":false},{"pmid":"16818867","id":"PMC_16818867","title":"Association testing of the positional and functional candidate gene SLC1A1/EAAC1 in early-onset obsessive-compulsive disorder.","date":"2006","source":"Archives of general psychiatry","url":"https://pubmed.ncbi.nlm.nih.gov/16818867","citation_count":181,"is_preprint":false},{"pmid":"9542890","id":"PMC_9542890","title":"EAAC1, a high-affinity glutamate tranporter, is localized to astrocytes and gabaergic neurons besides pyramidal cells in the rat cerebral cortex.","date":"1998","source":"Cerebral cortex (New York, N.Y. : 1991)","url":"https://pubmed.ncbi.nlm.nih.gov/9542890","citation_count":176,"is_preprint":false},{"pmid":"22539860","id":"PMC_22539860","title":"The density of EAAC1 (EAAT3) glutamate transporters expressed by neurons in the mammalian CNS.","date":"2012","source":"The Journal of neuroscience : the official journal of the Society for Neuroscience","url":"https://pubmed.ncbi.nlm.nih.gov/22539860","citation_count":169,"is_preprint":false},{"pmid":"17894418","id":"PMC_17894418","title":"Association of the SLC1A1 glutamate transporter gene and obsessive-compulsive disorder.","date":"2007","source":"American journal of medical genetics. 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GTRAP3-18 expression can be upregulated by retinoic acid, producing a specific reduction in EAAC1-mediated transport.\",\n      \"method\": \"Co-immunoprecipitation, pulldown mapping of C-terminal domain interaction, glutamate uptake assays in cells with overexpressed GTRAP3-18, retinoic acid treatment\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal protein interaction mapping, functional transport assays, domain mapping, replicated in multiple subsequent studies\",\n      \"pmids\": [\"11242046\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"Activation of protein kinase C (PKC) by phorbol ester (PMA) rapidly increases EAAC1-mediated glutamate transport activity in C6 glioma cells via a 2.5-fold increase in Vmax with no change in Km, independent of protein synthesis. An inactive phorbol ester and the PKC inhibitor chelerythrine block this effect.\",\n      \"method\": \"Radiolabeled glutamate uptake assays, kinetic analysis, pharmacological inhibitors (chelerythrine, cycloheximide), inactive phorbol ester controls\",\n      \"journal\": \"Journal of neurochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean pharmacological dissection with multiple controls, replicated in subsequent studies\",\n      \"pmids\": [\"8764574\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"Platelet-derived growth factor (PDGF) rapidly increases EAAC1 activity and cell surface expression via activation of phosphatidylinositol 3-kinase (PI3K). PDGF causes redistribution of EAAC1 from an intracellular compartment to the plasma membrane; this effect is blocked by PI3K inhibitors wortmannin and LY294002 but not by a PKC inhibitor.\",\n      \"method\": \"Membrane-impermeant biotinylation combined with Western blotting to measure surface EAAC1, radiolabeled glutamate uptake, PI3K activity assay, pharmacological inhibitors\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — biotinylation of surface protein, PI3K activity directly measured, multiple inhibitors used, replicated in subsequent studies\",\n      \"pmids\": [\"10671571\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"PKC activation with PMA induces formation of EAAC1-PKCα complexes but not EAAC1-PKCδ complexes in C6 glioma cells, and causes EAAC1 and PKCα to colocalize in clusters at or near the cell surface. EAAC1-PKCα complexes are also detected in rat brain synaptosomes. This interaction is blocked by PKC inhibitors.\",\n      \"method\": \"Co-immunoprecipitation in C6 glioma and synaptosomes, confocal microscopy colocalization, pharmacological inhibitors\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal co-IP in two systems (cells and synaptosomes), confocal colocalization, inhibitor controls\",\n      \"pmids\": [\"12843260\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"PKCα mediates the PKC-dependent increase in EAAC1 cell surface expression, while PKCε mediates an increase in EAAC1 transport activity independent of changes in surface expression (increased Vmax without surface redistribution). Gö6976 (PKCα inhibitor) completely blocks surface expression increase but only partially attenuates activity increase; PKC subtype-selective downregulation confirms this dissociation.\",\n      \"method\": \"PKC subtype identification by Western blot, selective inhibitor Gö6976, PKC downregulation by prolonged phorbol ester treatment, biotinylation assay, uptake assays\",\n      \"journal\": \"Molecular pharmacology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal approaches (pharmacological inhibition, PKC downregulation, biotinylation, transport assays) in single lab\",\n      \"pmids\": [\"12237337\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"EAAC1 has a half-life of approximately 5–7 min at the plasma membrane due to rapid constitutive recycling. Both PKC (phorbol ester) and PDGF accelerate delivery of EAAC1 to the cell surface; PKC additionally inhibits endocytosis of EAAC1, whereas PDGF does not. Basal and regulated pools of EAAC1 exist in distinct intracellular compartments, as incubation at 18°C blocks regulated but not basal trafficking.\",\n      \"method\": \"Multiple biotinylation strategies (surface labeling at 37°C, reversible biotinylation to measure internalization), temperature block experiments in C6 glioma and primary neuronal cultures\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal biotinylation methods, temperature block, two cell systems\",\n      \"pmids\": [\"15197183\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"A carboxyl-terminal motif (502)YVN(504) in EAAC1 is required for both PDGF-dependent and PKC-dependent regulated trafficking to the cell surface. A 12-amino acid sequence starting at this tyrosine is sufficient to confer PDGF-responsiveness to a non-responsive chimera. The glial transporter GLT-1 carboxyl terminus does not confer regulated trafficking, but replacing it with EAAC1's carboxyl terminus does.\",\n      \"method\": \"Domain chimeras between EAAC1 and GLT-1, alanine substitution mutagenesis, truncation mutants, biotinylation surface expression assays in C6 glioma\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — mutagenesis with chimeras, alanine scanning, functional trafficking readout; single lab but rigorous domain mapping\",\n      \"pmids\": [\"16368696\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Akt (PKB) is required downstream of PI3K for PDGF-induced redistribution and increased surface expression of EAAC1. A dominant-negative Akt-1 blocks PDGF-induced EAAC1 redistribution; constitutively active Akt-1 increases EAAC1 surface expression; lentiviral CA-Akt-1 increases both surface EAAC1 and Na+-dependent glutamate transport activity.\",\n      \"method\": \"Dominant-negative and constitutively active Akt-1 transfection, lentiviral expression of CA-Akt, biotinylation surface expression assay, glutamate uptake assay, Akt phosphorylation (Ser473) measurement\",\n      \"journal\": \"Neuropharmacology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — dominant-negative and gain-of-function approaches, lentiviral vector, multiple functional readouts\",\n      \"pmids\": [\"16182322\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Individual subunits within the EAAC1 homotrimer function independently of each other. Coexpression of EAAC1(WT) with EAAC1(R446Q) (transports glutamine not glutamate) produces purely additive anion currents. Coexpression with EAAC1(H295K) (90-fold reduced glutamate affinity) yields two independent populations matching individual subunit affinities. pH-dependence studies with EAAC1(E373Q) similarly show independent subunit function.\",\n      \"method\": \"Electrophysiology (anion currents), coexpression of WT and mutant subunits in cells, glutamate concentration-response curves, pH-dependence assays\",\n      \"journal\": \"Biochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro functional reconstitution with multiple mutant combinations, electrophysiological assays, converging evidence from three independent mutant pairs\",\n      \"pmids\": [\"16128593\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"RTN2B, a reticulon protein localized in the ER and ER exit sites, interacts with EAAC1 and with GTRAP3-18, binding to different regions of RTN2B. RTN2B enhances ER exit and cell surface expression of EAAC1 in heterologous cells. siRNA knockdown of RTN2B decreases EAAC1 protein levels in neurons. Thus RTN2B acts as a positive regulator of EAAC1 trafficking from ER to cell surface, counteracting GTRAP3-18.\",\n      \"method\": \"Co-immunoprecipitation of RTN2B with EAAC1 and GTRAP3-18, domain binding analysis, surface expression assays in heterologous cells, siRNA knockdown in neurons, Western blotting\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal co-IP, domain mapping, siRNA functional rescue, surface expression measurement\",\n      \"pmids\": [\"18096700\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Syntaxin 1A promotes endocytic sorting of EAAC1 via clathrin-mediated internalization, leading to functional inhibition of glutamate transport. The H3 coiled-coil domain of syntaxin 1A (in the presence of its transmembrane domain) is necessary and sufficient for this inhibitory effect. Endogenous syntaxin 1A knockdown blocks EAAC1 endocytic sorting and lysosomal degradation triggered by kainic acid.\",\n      \"method\": \"Clathrin-mediated endocytosis assays, syntaxin 1A domain deletion constructs, co-immunoprecipitation, siRNA knockdown in rat model, glutamate transport functional assay\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — domain deletion mapping, siRNA knockdown with functional readout, endocytosis pathway characterization\",\n      \"pmids\": [\"16959903\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"A dominant-negative variant of SNAP-23 (lacking the SNARE domain) decreases EAAC1 surface expression and slows constitutive delivery of EAAC1 to the plasma membrane. C6 glioma expresses syntaxin 4, VAMP2, and SNAP-23 but not syntaxin 1A, VAMP1, or SNAP-25, indicating that SNAP-23-containing SNARE complexes (not syntaxin 1A) are required for constitutive EAAC1 recycling.\",\n      \"method\": \"Western blotting of SNARE proteins, co-transfection with dominant-negative SNAP-23, biotinylation surface expression assay, rate-of-delivery assay, Myc-tagged EAAC1\",\n      \"journal\": \"Neurochemistry international\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — dominant-negative approach with surface expression readout, single lab, single method for the key claim\",\n      \"pmids\": [\"16516346\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Activation of the Gq/11-coupled neurotensin receptor NTS1 rapidly increases EAAC1-mediated aspartate uptake (~70%) in C6 glioma by increasing cell surface expression of EAAC1 via a cytoskeleton-dependent mechanism. Cytochalasin D and colchicine (actin and microtubule disruptors) block this effect, whereas PKC and PI3K inhibitors do not.\",\n      \"method\": \"Radiolabeled D-aspartate uptake assay, stable NTS1-expressing C6 glioma, cytoskeletal inhibitors (cytochalasin D, colchicine), PKC and PI3K inhibitor controls\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — functional trafficking assay with pharmacological dissection, single lab, single method for surface expression change\",\n      \"pmids\": [\"12123836\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"In Huntington's disease knock-in neurons, mutant huntingtin causes defective Rab11-dependent recycling endosome trafficking, leading to reduced cell surface levels of EAAC1 and impaired cysteine uptake. Expression of dominant-active Rab11 in HD neurons restores EAAC1 surface expression, cysteine uptake, intracellular glutathione, ROS clearance, and neuronal survival.\",\n      \"method\": \"Cell surface biotinylation, cysteine uptake assays, glutathione measurement, ROS assays, dominant-active Rab11 rescue in primary HD neurons from HD140Q/140Q knock-in mice\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (biotinylation, uptake, GSH, ROS, survival), dominant-active rescue, primary neuronal culture model\",\n      \"pmids\": [\"20357106\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Loss of EAAC1 (EAAC1-/- mice) impairs neuronal cysteine uptake, reduces glutathione synthesis, increases cytosolic and vesicular zinc, and exacerbates hippocampal neuronal death after transient cerebral ischemia (~2-fold). N-acetylcysteine treatment restores glutathione, normalizes zinc levels, and reduces ischemia-induced zinc translocation, superoxide production, and neuronal death.\",\n      \"method\": \"EAAC1 knockout mouse model, transient cerebral ischemia model, histological neuronal death quantification, zinc fluorescence, superoxide detection, NAC pharmacological rescue\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean genetic KO with defined mechanistic pathway (cysteine→GSH→zinc buffering), pharmacological rescue with NAC confirming mechanism\",\n      \"pmids\": [\"21084597\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Loss-of-function mutations R445W and I395del in SLC1A1 impede or abolish glutamate and cysteine transport, and lead to near-absent surface expression in a kidney cell line, causing human dicarboxylic aminoaciduria. This establishes SLC1A1 as the major renal transporter of glutamate and aspartate in humans.\",\n      \"method\": \"Transport assays in kidney cell line expressing mutant SLC1A1, surface expression assays, identification of R445W and I395del mutations in human patients with dicarboxylic aminoaciduria\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — functional mutagenesis (transport assays + surface expression), disease-linked mutations, human genetic validation\",\n      \"pmids\": [\"21123949\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"SGK1 (serum- and glucocorticoid-inducible kinase 1) co-localizes with EAAT3 in retinal ganglion cells and stimulates EAAT3-mediated glutamate transport when co-expressed in Xenopus oocytes. Constitutively active SGK1 (S422D) and constitutively active PKB stimulate transport, whereas inactive SGK1 (K127N) does not.\",\n      \"method\": \"Immunohistochemistry for colocalization, Xenopus oocyte expression with dual electrode voltage clamp, constitutively active and dominant-negative SGK1 and PKB constructs\",\n      \"journal\": \"Investigative ophthalmology & visual science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — electrophysiology in Xenopus oocytes with gain-of-function and loss-of-function constructs, colocalization supporting biological relevance; single lab\",\n      \"pmids\": [\"15111600\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"EAAC1 has a unique anti-apoptotic function independent of glutamate removal: during apoptotic stimuli, holocytochrome c synthetase (HCCS) translocates from mitochondria and suppresses XIAP (activating caspase-3). The N-terminus of EAAC1 binds HCCS, interfering with the HCCS-XIAP interaction and thereby maintaining XIAP activity and inhibiting caspase-3. This mechanism rescues PC12 cells from NGF deprivation and protects motor neurons from nerve injury.\",\n      \"method\": \"Co-immunoprecipitation of EAAC1 N-terminus with HCCS, binding competition assays (HCCS-XIAP interaction), caspase-3 activity assay, PC12 cell and motor neuron rescue experiments\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP mapping, competition binding, functional apoptosis assays, in vitro and in vivo neuronal models\",\n      \"pmids\": [\"16858406\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"GTRAP3-18 negatively regulates neuronal glutathione synthesis by interacting with EAAC1 at the plasma membrane, reducing cysteine uptake. Increasing GTRAP3-18 at the plasma membrane (via methyl-β-cyclodextrin) decreases GSH and increases oxidative stress vulnerability; decreasing GTRAP3-18 with antisense oligonucleotides increases GSH. PKC-stimulated EAAC1 activity increase is blocked by elevated surface GTRAP3-18.\",\n      \"method\": \"HEK293 cell model, antisense oligonucleotide knockdown, methyl-β-cyclodextrin to increase surface GTRAP3-18, GSH measurement, oxidative stress assays, PKC activation\",\n      \"journal\": \"Molecular pharmacology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal approaches (gain and loss of GTRAP3-18, PKC stimulation), GSH functional readout, consistent with in vivo data from same group\",\n      \"pmids\": [\"17646425\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"GTRAP3-18 regulates neuronal glutathione levels in vivo by controlling EAAC1-mediated cysteine uptake. Increased GTRAP3-18 decreases GSH and increases oxidative stress vulnerability in vitro and in vivo; decreased GTRAP3-18 increases GSH levels in vitro and in vivo.\",\n      \"method\": \"In vitro cell culture and in vivo (rodent) experiments, GTRAP3-18 protein level manipulation, GSH measurement, oxidative stress vulnerability assays\",\n      \"journal\": \"Amino acids\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro and in vivo validation, consistent mechanistic direction; builds on prior studies but abstract less detailed on methods\",\n      \"pmids\": [\"21373771\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"ARL6IP1 indirectly promotes EAAC1-mediated glutamate transport by binding directly to addicsin (GTRAP3-18/Arl6ip5), competing for addicsin binding to EAAC1. The hydrophobic region (aa 103-117) of addicsin is crucial for both Arl6ip1-addicsin heterodimer and addicsin homodimer formation. In the presence of PKC activation, ARL6IP1 overexpression increases EAAC1-mediated transport by increasing glutamate affinity (not Vmax). The addicsin Y110A/L112A mutant (lacking Arl6ip1 binding) abolishes this enhancement.\",\n      \"method\": \"Co-immunoprecipitation, alanine mutagenesis of addicsin binding region, glutamate transport assays, kinetic analysis, PKC activation with PMA\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP domain mapping, mutagenesis, functional transport assays with kinetics; single lab\",\n      \"pmids\": [\"18684713\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"EAAC1 is expressed in neuronal and glial mitochondria where it participates in glutamate-stimulated ATP production. EAAC1 physically interacts with the sodium/calcium exchanger NCX1 in mitochondria; NCX1 activity is essential for EAAC1-mediated glutamate-stimulated ATP synthesis. Antisense knockdown of either EAAC1 or NCX1 abolishes this mitochondrial metabolic response.\",\n      \"method\": \"Western blot, confocal microscopy, immunoelectron microscopy, luciferase-luciferin ATP assay, pharmacological blockers, EAAC1 and NCX1 antisense oligonucleotides, co-immunoprecipitation\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple detection methods for mitochondrial localization, co-IP for physical interaction, antisense knockdown functional assay; single lab, somewhat unexpected finding\",\n      \"pmids\": [\"22479505\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"SorCS2 acts as a sorting receptor that sustains EAAC1/EAAT3 cell surface expression to facilitate cysteine import and glutathione synthesis. Lack of SorCS2 depletes EAAT3 from the plasma membrane, impairs neuronal cysteine uptake, causes oxidative brain damage, and increases neuronal death and mortality during epilepsy in SorCS2-deficient mice.\",\n      \"method\": \"SorCS2-knockout mouse model, EAAT3 surface expression assay, cysteine uptake assay, glutathione measurement, oxidative stress and neuronal death quantification in epilepsy model\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic KO model, surface expression, uptake, and GSH functional readouts, disease-relevant phenotype\",\n      \"pmids\": [\"30840898\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"EAAT3/SLC1A1 loss in the midbrain (but not striatum) reduces dopamine release in the dorsal striatum. Slc1a1-STOP mice show reduced extracellular dopamine, impaired locomotor and stereotypic responses to amphetamine, reduced D1 receptor binding in the dorsal striatum, and diminished OCD-like grooming behavior. Viral restoration of EAAT3 in the midbrain (but not striatum) partially rescues these phenotypes, consistent with a presynaptic dopaminergic role for EAAT3.\",\n      \"method\": \"STOP-cassette conditional knockout mouse, amphetamine locomotor and stereotypy assays, in vivo microdialysis for extracellular dopamine, D1 receptor autoradiography, immediate early gene induction assay, viral vector-mediated regional rescue\",\n      \"journal\": \"PNAS\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional KO, regional viral rescue, multiple behavioral and neurochemical endpoints, mechanistic pathway placement\",\n      \"pmids\": [\"28507136\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Mice with EAAT3 overexpression driven by CaMKIIα promoter (EAAT3glo/CMKII) display increased anxiety-like and repetitive behaviors, greater fear conditioning, and altered NMDA receptor subunit composition and NMDA-dependent synaptic plasticity at corticostriatal synapses. These behavioral effects are reversed by chronic fluoxetine or clomipramine treatment.\",\n      \"method\": \"Cre-dependent transgenic overexpression, behavioral assays (anxiety, repetitive behaviors, fear conditioning), electrophysiology at corticostriatal synapses, NMDA subunit biochemical analysis, pharmacological rescue\",\n      \"journal\": \"Neuropsychopharmacology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — transgenic gain-of-function model, behavioral, electrophysiological, and biochemical endpoints, pharmacological validation\",\n      \"pmids\": [\"30622300\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"PKC activation by phorbol ester inhibits EAAC1 in Xenopus oocytes by promoting its retrieval from the plasma membrane, reducing Imax with no change in Km. PMA simultaneously decreased membrane capacitance and increased cytosolic EAAC1 accumulation. This effect is PKC-mediated (blocked by PKC inhibitors; inactive 4α-PDD has no effect). Notably, this is opposite to the stimulatory PKC effect seen in C6 glioma cells, demonstrating cell-type specificity of PKC regulation.\",\n      \"method\": \"Xenopus oocyte expression system, [3H]L-glutamate uptake, dual electrode voltage clamp, PKC inhibitors, membrane capacitance measurement, EAAC1 protein localization\",\n      \"journal\": \"Brain research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — Xenopus oocyte electrophysiology with inhibitor controls; cell-type specific effect noted but mechanistic basis not fully resolved\",\n      \"pmids\": [\"11578612\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Wild-type PIP5K2A (phosphatidylinositol-4-phosphate 5-kinase IIα) increases EAAT3 transport activity and membrane abundance in Xenopus oocytes and HEK cells. The schizophrenia-associated mutant (N251S)PIP5K2A exerts a dominant inhibitory effect, decreasing EAAT3 membrane abundance and transport activity, even in the presence of wild-type PIP5K2A.\",\n      \"method\": \"Xenopus oocyte co-expression, dual electrode voltage clamp, confocal microscopy, chemiluminescence membrane protein quantification in HEK cells\",\n      \"journal\": \"Psychopharmacology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — electrophysiology and surface expression in two systems, dominant-negative disease mutant; single lab\",\n      \"pmids\": [\"19644675\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"AMP-activated protein kinase (AMPK) downregulates EAAT3 (and EAAT4) by reducing their membrane abundance. Constitutively active AMPK (γR70Q) or wild-type AMPK co-expressed with EAAT3 in Xenopus oocytes significantly decreases maximal glutamate-induced current (Ig) without changing Km; inactive AMPK (αK45R) has no effect.\",\n      \"method\": \"Xenopus oocyte expression, dual electrode voltage clamp, confocal microscopy for membrane abundance, Western blotting\",\n      \"journal\": \"Journal of neurochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — electrophysiology with active/inactive kinase constructs, surface expression confirmed by confocal; single lab\",\n      \"pmids\": [\"20218975\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"mTOR coexpression significantly increases EAAT3 transport activity (glutamate-induced current) and EAAT3 membrane protein abundance in Xenopus oocytes; this effect is reversed by rapamycin (100 nM). The decay of transport current after brefeldin A treatment is similar with and without rapamycin, suggesting mTOR regulates delivery rather than retrieval of EAAT3.\",\n      \"method\": \"Xenopus oocyte co-expression, dual electrode voltage clamp, rapamycin pharmacology, brefeldin A carrier insertion block, chemiluminescence for membrane protein quantification\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — electrophysiology with pharmacological controls in Xenopus oocytes; single lab, single expression system\",\n      \"pmids\": [\"22483750\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Three alternative SLC1A1/EAAC1 mRNA isoforms (P2 internal promoter transcript, ex2skip lacking exon 2, ex11skip lacking exon 11) all inhibit glutamate uptake by the full-length EAAC1 transporter. Ex2skip and ex11skip isoforms partially colocalize with and physically interact with the full-length EAAC1 protein.\",\n      \"method\": \"Isoform cloning, co-immunoprecipitation, colocalization studies, glutamate uptake inhibition assays\",\n      \"journal\": \"Translational psychiatry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — co-IP and functional inhibition assays; single lab, no domain-level mechanistic resolution\",\n      \"pmids\": [\"23695234\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"EAAC1 protein is localized on the luminal (apical) membrane of S2 and S3 segments of proximal renal tubules, consistent with a role as the apical high-affinity glutamate transporter mediating reabsorption of acidic amino acids in the kidney beyond early S1 segments.\",\n      \"method\": \"In situ hybridization, immunofluorescence microscopy with anti-EAAC1 antibodies, Western blotting of kidney cortex and medulla fractions\",\n      \"journal\": \"The American journal of physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — direct immunolocalization with biochemical fractionation; replicated by clinical mutation studies; no functional transport measurement in situ\",\n      \"pmids\": [\"9435692\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"EAAC1 is localized perisynaptically (outside the synaptic specialization) in dendritic membranes and cytoplasm of hippocampal neurons, with membrane-associated EAAC1 not intermingled with GluR2 within the synaptic complex. A significant presynaptic pool of EAAC1 also exists. EAAC1 is not at the postsynaptic density but is ideally positioned to regulate perisynaptic and presynaptic glutamate levels.\",\n      \"method\": \"Pre-embedding immunoelectron microscopy, post-embedding double-label immunogold localization, EAAC1 vs. GluR2 spatial mapping in rat hippocampus\",\n      \"journal\": \"The Journal of comparative neurology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Strong — high-resolution immunoelectron microscopy, double-label quantification, replicated by multiple labs\",\n      \"pmids\": [\"10701825\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"SLC1A1 actively recycles extracellular glutamate into lung cancer cells, which enhances the efficiency of cystine uptake via the cystine/glutamate antiporter Xc- and promotes glutathione biosynthesis. Depletion of SLC1A1 increases extracellular glutamate, inhibits cystine uptake, blocks GSH synthesis, and induces oxidative stress-mediated cell death. This is demonstrated by stable isotope-assisted metabolomics.\",\n      \"method\": \"SLC1A1 knockdown and overexpression, stable isotope-assisted metabolomics (cystine and glutamate flux measurement), extracellular glutamate measurement, GSH quantification, cell death assays\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — isotope tracing metabolomics, gain and loss of function, mechanistic pathway (glutamate recycling→Xc- cystine uptake→GSH) rigorously tested\",\n      \"pmids\": [\"33229341\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"SLC1A1, preferentially expressed in vascular endothelial cells, imports oncometabolite R-2-hydroxyglutarate (R-2-HG) from IDH1-mutant tumor microenvironment into endothelial cells and traffics it to mitochondria. R-2-HG via SLC1A1 promotes mitochondrial Na+/Ca2+ exchange, activates the mitochondrial respiratory chain, and fuels endothelial cell migration and tumor angiogenesis. SLC1A1 deficiency in mice abolishes mIDH1-promoted tumor angiogenesis.\",\n      \"method\": \"SLC1A1-knockout mice, tumor angiogenesis assays, R-2-HG uptake and subcellular fractionation, mitochondrial respiration assays, Ca2+ and Na+ flux measurements, endothelial migration assays\",\n      \"journal\": \"Cell research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic KO mouse, cellular transport assays, mitochondrial functional assays, in vivo tumor angiogenesis readout, multiple orthogonal methods\",\n      \"pmids\": [\"35459936\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"SLC1A1/EAAC1 is a Na+-dependent plasma membrane transporter for glutamate, aspartate, and cysteine whose surface expression and activity are tightly controlled by rapid recycling between an intracellular pool and the cell surface; this trafficking is positively regulated by PKCα (via direct complex formation), PDGF→PI3K→Akt signaling, SGK1, mTOR, SorCS2, and RTN2B (ER exit), and negatively regulated by GTRAP3-18 (C-terminal interaction reducing substrate affinity and blocking ER exit), syntaxin 1A (clathrin-mediated endocytosis), AMPK, and a dominant-negative SNAP-23 variant; the C-terminal YVN motif is required for PKC- and PDGF-dependent regulated trafficking; individual subunits within the EAAC1 homotrimer function independently; beyond glutamate clearance, EAAC1 provides neuronal cysteine for glutathione synthesis (critical for antioxidant defense and zinc buffering), possesses an anti-apoptotic function through its N-terminal binding to holocytochrome c synthetase (HCCS) that preserves XIAP activity, and in the midbrain influences presynaptic dopaminergic function and striatal dopamine release; in endothelial cells SLC1A1 additionally imports R-2-hydroxyglutarate and drives tumor angiogenesis via mitochondrial Na+/Ca2+ exchange.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"SLC1A1 (EAAC1/EAAT3) is a Na+-dependent, high-affinity plasma membrane transporter for glutamate, aspartate, and cysteine whose activity is governed largely by rapid, regulated trafficking between an intracellular pool and the cell surface, where the protein has a half-life of only ~5\\u20137 minutes due to constitutive recycling [#5]. Surface delivery and transport are acutely stimulated through parallel signaling routes: PKC activation increases transport, with PKC\\u03b1 forming direct EAAC1\\u2013PKC\\u03b1 complexes that drive surface expression while PKC\\u03b5 raises intrinsic activity [#1, #3, #4], and PDGF acts through PI3K\\u2192Akt to redistribute the transporter to the membrane [#2, #7]; both regulated pathways depend on a C-terminal (502)YVN(504) motif [#6]. ER exit and surface stability are set by competing interactions at the cytoplasmic tail\\u2014GTRAP3-18 binds the C-terminus to lower substrate affinity and restrain ER export, while RTN2B and ARL6IP1 oppose GTRAP3-18 to promote forward trafficking [#0, #9, #20], and the sorting receptor SorCS2 sustains surface levels [#22]; conversely syntaxin 1A drives clathrin-mediated endocytosis and degradation [#10]. Functionally, EAAC1 imports cysteine to support neuronal glutathione synthesis and antioxidant/zinc-buffering defense, such that its loss exacerbates ischemic and epileptic neuronal death [#13, #14, #18, #22], and the same glutamate-recycling/cysteine-supply logic drives glutathione biosynthesis and survival in cancer cells via cooperation with system Xc- [#32]. Independent of transport, the EAAC1 N-terminus binds holocytochrome c synthetase to preserve XIAP activity and confer an anti-apoptotic function [#17]. In vivo, EAAC1 controls midbrain presynaptic dopaminergic signaling and OCD-like behaviors [#23, #24], and loss-of-function mutations cause human dicarboxylic aminoaciduria, establishing it as the major renal acidic-amino-acid transporter [#15, #30]. A distinct vascular role imports the oncometabolite R-2-hydroxyglutarate into endothelial mitochondria to drive Na+/Ca2+ exchange and tumor angiogenesis [#33].\",\n  \"teleology\": [\n    {\n      \"year\": 1996,\n      \"claim\": \"Established that EAAC1 transport is acutely regulated by intracellular signaling rather than only by expression level, opening the question of how a kinase changes transporter output.\",\n      \"evidence\": \"PKC activation by phorbol ester in C6 glioma, with kinetic analysis and PKC inhibitors\",\n      \"pmids\": [\"8764574\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not determine whether increased Vmax reflected more surface transporters or higher per-molecule activity\", \"PKC isoform not identified\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Showed the regulatory mechanism is trafficking-based, linking growth-factor signaling to physical redistribution of the transporter to the membrane.\",\n      \"evidence\": \"PDGF stimulation with surface biotinylation, PI3K activity assay, and PI3K inhibitors\",\n      \"pmids\": [\"10671571\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Downstream effector of PI3K not yet defined\", \"Trafficking step (delivery vs. retrieval) not resolved\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Identified a direct C-terminal binding partner (GTRAP3-18) that suppresses transport by lowering substrate affinity, defining a protein-interaction mode of regulation distinct from trafficking.\",\n      \"evidence\": \"Co-IP, C-terminal domain mapping, and glutamate uptake assays with retinoic-acid induction\",\n      \"pmids\": [\"11242046\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which affinity is lowered not structurally resolved\", \"Whether GTRAP3-18 acts in ER vs. plasma membrane not yet distinguished\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Revealed cell-type specificity of PKC regulation, showing the same kinase can drive opposite trafficking outcomes.\",\n      \"evidence\": \"Xenopus oocyte electrophysiology, capacitance measurement, and PKC inhibitors\",\n      \"pmids\": [\"11578612\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular basis for opposite directionality between oocytes and glioma not resolved\", \"Single expression system\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Defined PKC\\u03b1 vs. PKC\\u03b5 division of labor (surface expression vs. intrinsic activity) and added a Gq-coupled receptor, cytoskeleton-dependent route, broadening the regulatory network.\",\n      \"evidence\": \"PKC subtype-selective inhibition/downregulation with biotinylation; NTS1-driven aspartate uptake with cytoskeletal disruptors\",\n      \"pmids\": [\"12237337\", \"12123836\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Substrate(s) phosphorylated by each PKC isoform unknown\", \"How NTS1 couples to cytoskeleton-dependent insertion unresolved\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Demonstrated PKC\\u03b1 physically complexes with EAAC1, providing a molecular basis for isoform-specific surface regulation in cells and native brain tissue.\",\n      \"evidence\": \"Reciprocal co-IP in C6 glioma and synaptosomes plus confocal colocalization\",\n      \"pmids\": [\"12843260\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct vs. adaptor-mediated contact not established\", \"Phosphorylation site(s) on EAAC1 not mapped\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Quantified the rapid constitutive recycling of EAAC1 and separated basal from regulated intracellular pools, clarifying which trafficking step each stimulus controls.\",\n      \"evidence\": \"Multiple biotinylation/internalization strategies and temperature-block experiments in two cell systems\",\n      \"pmids\": [\"15197183\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of the regulated intracellular compartment not defined\", \"SNARE/vesicle machinery not yet identified\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Placed SGK1 (and PKB) as kinases stimulating EAAT3 transport, extending the kinase regulatory network.\",\n      \"evidence\": \"Xenopus oocyte voltage clamp with active/inactive SGK1 and PKB constructs plus retinal colocalization\",\n      \"pmids\": [\"15111600\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct vs. indirect kinase action not established\", \"Trafficking step affected not resolved\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Identified the cytoplasmic effector and the precise C-terminal motif required for regulated trafficking, and showed homotrimer subunits transport independently.\",\n      \"evidence\": \"Akt dominant-negative/constitutively-active rescue; EAAC1/GLT-1 chimeras and YVN alanine scanning; coexpression electrophysiology of WT and affinity mutants\",\n      \"pmids\": [\"16182322\", \"16368696\", \"16128593\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether YVN is directly phosphorylated or serves as a binding site unknown\", \"How independent subunit gating relates to regulated trafficking not addressed\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Resolved the endocytic and exocytic SNARE machinery, showing syntaxin 1A promotes clathrin-mediated removal/degradation while SNAP-23 SNAREs drive constitutive delivery.\",\n      \"evidence\": \"Syntaxin 1A domain deletions with siRNA knockdown and endocytosis/degradation assays; SNARE profiling with dominant-negative SNAP-23 and rate-of-delivery assays\",\n      \"pmids\": [\"16959903\", \"16516346\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether syntaxin 1A binds EAAC1 directly not fully established\", \"Cell-type variation in SNARE usage not reconciled\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Uncovered a transport-independent anti-apoptotic function: the EAAC1 N-terminus sequesters HCCS to preserve XIAP and block caspase-3.\",\n      \"evidence\": \"N-terminal co-IP with HCCS, HCCS\\u2013XIAP competition binding, caspase-3 assays, and PC12/motor neuron rescue\",\n      \"pmids\": [\"16858406\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of N-terminal HCCS binding not defined\", \"In vivo contribution relative to glutathione function unclear\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Defined the positive trafficking arm at the ER and at the membrane, with RTN2B promoting ER exit by counteracting GTRAP3-18 and surface GTRAP3-18 controlling cysteine uptake/glutathione.\",\n      \"evidence\": \"RTN2B co-IP, domain mapping, surface expression and neuronal siRNA; GTRAP3-18 gain/loss with GSH and oxidative-stress readouts\",\n      \"pmids\": [\"18096700\", \"17646425\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Quantitative balance between GTRAP3-18 and RTN2B at steady state unknown\", \"How retinoic acid couples to oxidative-stress state not detailed\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Showed ARL6IP1 tunes transport indirectly by competing for GTRAP3-18, adding a regulator-of-regulator layer that raises substrate affinity.\",\n      \"evidence\": \"Co-IP, addicsin hydrophobic-region mutagenesis, and kinetic transport assays under PKC activation\",\n      \"pmids\": [\"18684713\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"In vivo relevance not tested\", \"Single lab, single system\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Connected EAAC1 trafficking and cysteine supply to disease and stress, showing recycling-endosome defects, knockout, and ischemia converge on glutathione/zinc dysregulation and neuronal death.\",\n      \"evidence\": \"Rab11 dominant-active rescue in HD knock-in neurons; EAAC1-/- mice in cerebral ischemia with NAC rescue, zinc and superoxide readouts\",\n      \"pmids\": [\"20357106\", \"21084597\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relative contribution of cysteine supply vs. glutamate clearance to neuroprotection not separated\", \"Recycling-endosome adaptor for EAAC1 not identified\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Established SLC1A1 as the major human renal acidic amino-acid transporter through loss-of-function mutations causing dicarboxylic aminoaciduria, and added AMPK and PIP5K2A as regulators.\",\n      \"evidence\": \"Patient mutations R445W/I395del with transport and surface assays in kidney cells; Xenopus/HEK electrophysiology and surface assays for AMPK and PIP5K2A\",\n      \"pmids\": [\"21123949\", \"20218975\", \"19644675\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Renal vs. neuronal disease mechanisms not unified\", \"Direct vs. indirect action of AMPK/PIP5K2A on EAAT3 unresolved\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Added mTOR as a delivery-promoting regulator and described a mitochondrial EAAC1\\u2013NCX1 partnership supporting glutamate-stimulated ATP synthesis.\",\n      \"evidence\": \"Xenopus mTOR coexpression with rapamycin/brefeldin A; mitochondrial localization imaging, EAAC1\\u2013NCX1 co-IP, and antisense ATP assays\",\n      \"pmids\": [\"22483750\", \"22479505\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"How a plasma-membrane transporter reaches mitochondria not explained\", \"mTOR effect mechanism (direct vs. via Akt/SGK) unresolved\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Showed alternative SLC1A1 isoforms act as dominant inhibitors of the full-length transporter, adding transcript-level regulation relevant to psychiatric phenotypes.\",\n      \"evidence\": \"Isoform cloning, co-IP/colocalization, and glutamate-uptake inhibition assays\",\n      \"pmids\": [\"23695234\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism of dominant-negative inhibition not mapped\", \"Physiological abundance of isoforms unknown\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Linked EAAT3 dosage to behavior and synaptic physiology in vivo, with midbrain loss reducing striatal dopamine and overexpression producing OCD-like, fluoxetine-reversible phenotypes.\",\n      \"evidence\": \"STOP-cassette conditional KO with regional viral rescue and microdialysis; CaMKII\\u03b1-driven overexpression with behavior, corticostriatal electrophysiology, and drug rescue\",\n      \"pmids\": [\"28507136\", \"30622300\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular link between transport activity and dopamine release not defined\", \"Whether glutamate clearance or cysteine supply drives behavior unresolved\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Identified SorCS2 as a sorting receptor sustaining EAAT3 surface levels for cysteine import, with deficiency causing oxidative damage and worse epilepsy outcomes.\",\n      \"evidence\": \"SorCS2-knockout mice with surface expression, cysteine uptake, GSH, and neuronal death assays in epilepsy\",\n      \"pmids\": [\"30840898\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Trafficking itinerary controlled by SorCS2 not mapped\", \"Relationship to GTRAP3-18/RTN2B network unexamined\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Extended SLC1A1 beyond neurons and amino acids, showing endothelial import of the oncometabolite R-2-HG to mitochondria drives Na+/Ca2+ exchange and tumor angiogenesis; and that glutamate recycling fuels cancer glutathione synthesis via system Xc-.\",\n      \"evidence\": \"SLC1A1-KO mice and endothelial assays with R-2-HG uptake/fractionation and mitochondrial respiration; isotope-tracing metabolomics in lung cancer with knockdown/overexpression\",\n      \"pmids\": [\"35459936\", \"33229341\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Substrate selectivity allowing R-2-HG transport not structurally defined\", \"Whether mitochondrial localization seen in neurons applies to endothelial cells unresolved\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How the multiple converging regulators (PKC isoforms, PI3K/Akt, SGK1, mTOR, AMPK, GTRAP3-18/RTN2B/ARL6IP1, syntaxin 1A, SNAP-23, SorCS2) are integrated on a single C-terminal/N-terminal interface to set net surface density in a given cell type remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unified structural model of the regulated cytoplasmic interface\", \"Hierarchy and crosstalk among kinase and adaptor pathways not established\", \"Tissue-specific determinants of opposite PKC outcomes unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005215\", \"supporting_discovery_ids\": [1, 2, 8, 15, 30, 32, 33]},\n      {\"term_id\": \"GO:0140313\", \"supporting_discovery_ids\": [17]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [2, 5, 30, 31]},\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [9]},\n      {\"term_id\": \"GO:0005739\", \"supporting_discovery_ids\": [21, 33]},\n      {\"term_id\": \"GO:0005768\", \"supporting_discovery_ids\": [13]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-382551\", \"supporting_discovery_ids\": [2, 15, 30, 32]},\n      {\"term_id\": \"R-HSA-112316\", \"supporting_discovery_ids\": [23, 24, 31]},\n      {\"term_id\": \"R-HSA-9609507\", \"supporting_discovery_ids\": [5, 9, 10, 22]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [17]},\n      {\"term_id\": \"R-HSA-8953897\", \"supporting_discovery_ids\": [14, 18]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"GTRAP3-18\", \"PRKCA\", \"RTN2B\", \"ARL6IP1\", \"STX1A\", \"SorCS2\", \"HCCS\", \"NCX1\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":7,"faith_pct":85.71428571428571}}