{"uniprot":"Q7Z3D6","gene":"DGLUCY","name":"D-glutamate cyclase, mitochondrial","organism":"Homo sapiens (Human)","status":"dark","length":616,"sequence":"MPFTLHLRSRLPSAIRSLILQKKPNIRNTSSMAGELRPASLVVLPRSLAPAFERFCQVNTGPLPLLGQSEPEKWMLPPQGAISETRMGHPQFWKYEFGACTGSLASLEQYSEQLKDMVAFFLGCSFSLEEALEKAGLPRRDPAGHSQTTVPCVTHAGFCCPLVVTMRPIPKDKLEGLVRACCSLGGEQGQPVHMGDPELLGIKELSKPAYGDAMVCPPGEVPVFWPSPLTSLGAVSSCETPLAFASIPGCTVMTDLKDAKAPPGCLTPERIPEVHHISQDPLHYSIASVSASQKIRELESMIGIDPGNRGIGHLLCKDELLKASLSLSHARSVLITTGFPTHFNHEPPEETDGPPGAVALVAFLQALEKEVAIIVDQRAWNLHQKIVEDAVEQGVLKTQIPILTYQGGSVEAAQAFLCKNGDPQTPRFDHLVAIERAGRAADGNYYNARKMNIKHLVDPIDDLFLAAKKIPGISSTGVGDGGNELGMGKVKEAVRRHIRHGDVIACDVEADFAVIAGVSNWGGYALACALYILYSCAVHSQYLRKAVGPSRAPGDQAWTQALPSVIKEEKMLGILVQHKVRSGVSGIVGMEVDGLPFHNTHAEMIQKLVDVTTAQV","function_summary":"A soluble mitochondrial matrix enzyme that assembles a lyase-like catalytic chamber to cyclize D‑glutamate and thereby tune glutamate-centered metabolism. Its two-lobed architecture supports oligomerization and broad protein-binding capacity, positioning it as a matrix-resident catalyst that coordinates flux between acidic amino acid handling and central carbon pathways through regulated intramolecular cyclization chemistry.","plain_language":"DGLUCY has barely been studied. The model's best guess: A soluble mitochondrial matrix enzyme that assembles a lyase-like catalytic chamber to cyclize D‑glutamate and thereby tune glutamate-centered metabolism. Its two-lobed architecture supports oligomerization and broad protein-binding capacity, positioning it as a matrix-resident catalyst that coordinates flux between acidic amino acid handling and central carbon pathways through regulated intramolecular cyclization chemistry.","uniprot_summary":"Probable mitochondrial D-glutamate cyclase.","go_terms":{"molecular_function":[{"id":"GO:0005515","label":"protein binding"}],"biological_process":[{"id":"GO:0006536","label":"glutamate metabolic process"}],"cellular_component":[{"id":"GO:0005759","label":"mitochondrial matrix"}]},"interpro":[{"id":"IPR038021","name":"Putative hydro-lyase","type":"homologous_superfamily","start":6,"end":257},{"id":"IPR009906","name":"D-glutamate cyclase-like domain","type":"domain","start":118,"end":255},{"id":"IPR025504","name":"D-glutamate cyclase-like, C-terminal","type":"domain","start":298,"end":608},{"id":"IPR017135","name":"D-glutamate cyclase, mitochondrial","type":"family","start":1,"end":616}],"reasoning":"I begin with the InterPro architecture. The sequence is globally classified by IPR017135 (D-glutamate cyclase, mitochondrial family) spanning residues 1–616, indicating a full-length mitochondrial D-glutamate cyclase scaffold. The N-terminal half carries IPR038021 (Putative hydro-lyase homologous superfamily, residues 6–257), which defines a lyase-like fold that catalyzes intramolecular eliminations and cyclizations rather than classical hydrolysis. Nested within this N-terminal region is IPR009906 (D-glutamate cyclase-like domain, residues 118–255), a catalytic core that shapes the active-site cavity for D-glutamate ring closure. The C-terminal half is marked by IPR025504 (D-glutamate cyclase-like, C-terminal domain, residues 298–608), which typically stabilizes oligomeric assemblies and completes the catalytic chamber. The ordered layout—an N-terminal lyase-like core followed by a C-terminal stabilizing module—creates a two-lobed enzyme that binds and transforms acidic amino acid substrates through intramolecular cyclization chemistry.\n\nThis architecture dictates molecular function. The lyase-superfamily core (IPR038021) and the cyclase-like domains (IPR009906 and IPR025504) together generate a catalytic pocket specialized for ring-forming reactions on D-glutamate. Such folds commonly require multivalent contacts for assembly and regulation, which supports a general capacity for GO:0005515 protein binding as an intrinsic property of the enzyme’s oligomerization and complex formation.\n\nFrom function to process, intramolecular cyclization of D-glutamate feeds directly into amino acid handling pathways. By converting D-glutamate and related acidic amino acids, the enzyme modulates pools and fluxes that impinge on nitrogen and carbon shuttles, aligning with GO:0006536 glutamate metabolic process. The mitochondrial context of this chemistry positions it at a key junction where D-glutamate and D-glutamyl groups are interconverted and recycled.\n\nCellular location follows from both the family assignment and the soluble, non-transmembrane architecture. The absence of membrane signatures and the soluble enzyme fold point to a matrix-resident catalyst. This supports localization to GO:0005759 mitochondrial matrix, consistent with a matrix-facing metabolic hub that interfaces with the TCA cycle and amino acid catabolism.\n\nMechanistically, the N-terminal lyase-like core binds D-glutamate and promotes intramolecular cyclization, while the C-terminal domain enforces quaternary structure and substrate channeling. This arrangement likely forms higher-order assemblies that tune activity and specificity. In the matrix, the enzyme plausibly associates with metabolic neighbors that handle glutamate and related intermediates—such as the mitochondrial aspartate aminotransferase and the 2-oxoglutarate dehydrogenase complex—to coordinate flux. It may also transiently bind assembly or import factors that maintain its matrix localization and oligomeric state. Together, these interactions situate the enzyme as a soluble matrix cyclase that shapes glutamate-centered metabolism through regulated protein–protein contacts and lyase-like chemistry.","category":"dark","control_evaluation":null,"validation_plan":null,"structure":{"source":"AlphaFold DB","pdb":"/structures/AF-Q7Z3D6.pdb","alphafold":"https://alphafold.ebi.ac.uk/entry/Q7Z3D6"},"links":{"uniprot":"https://www.uniprot.org/uniprotkb/Q7Z3D6/entry","atlas":"/p/Q7Z3D6"},"provenance":{"model":"BioReason-Pro (ESM3 esm3-sm-open-v1)","source_list":"Pharos Tdark","note":"AI prediction, not experimentally verified"}}