{"uniprot":"A2CJ06","gene":"DYTN","name":"Dystrotelin","organism":"Homo sapiens (Human)","status":"dark","length":578,"sequence":"MDPDKQDALNSIENSIYRTAFKLQSVQTLCQLDLIDSSLIQQVLLRPSFWEARKHSLSVQQLSQALQELFQKAREENPGQVHPRAPELTLSLLTTMYNSKGTGFLQLMPAAAALITLSGDSPLSKYRALFQLYAENSRGGYDSGPRMTRRVLRKLLTDLQQIPTFVGESRALCPVESATRSCFQGVLSPAIKEEKFLSWVQSEPPILLWLPTCHRLSAAERVTHPARCTLCRTFPITGLRYRCLKCLNFDICQMCFLSGLHSKSHQKSHPVIEHCIQMSAMQNTKLLFRTLRNNLLQGRCRKKEAARRQQLLDQVNPKGVPHHAQARLLKKQLNQYKDKLQAIYTSQEERICRFETRIHKLKTNQDSLWTKLQQIRRDLQARLQPPGPSSSSFQNVGNKVDHSSTEKVPKGGDYLQIKNATEDASTGEPLPKLDEVDRSHRSHTNAEHALRNPESPETTLHSTRAQSQTQKMPQKVISALPSYQEGLKQDIPKMVPAEMSSPALAAVEKKEAGNIKERKDELEEEELQELLSKLMDAFNLETPSGPESSVNMDLYSGAQRVCRAFSALVDQIALPNLK","function_summary":"A calcium-responsive scaffold that assembles membrane-proximal complexes controlling cytoskeletal organization during neuronal development. It uses tandem calcium-binding modules to sense intracellular Ca2+ and a zinc-finger docking site to stabilize interactions with cytoskeletal and membrane-associated partners. Operating predominantly in the cytoplasm with a dynamic pool at the cell surface, it coordinates adhesion and actin remodeling that drive neuron differentiation.","plain_language":"DYTN has barely been studied. The model's best guess: A calcium-responsive scaffold that assembles membrane-proximal complexes controlling cytoskeletal organization during neuronal development. It uses tandem calcium-binding modules to sense intracellular Ca2+ and a zinc-finger docking site to stabilize interactions with cytoskeletal and membrane-associated partners.","uniprot_summary":"May be involved in cytoskeletal organization.","go_terms":{"molecular_function":[{"id":"GO:0005515","label":"protein binding"}],"biological_process":[{"id":"GO:0030182","label":"neuron differentiation"}],"cellular_component":[{"id":"GO:0005886","label":"plasma membrane"}]},"interpro":[{"id":"IPR011992","name":"EF-hand domain pair","type":"homologous_superfamily","start":8,"end":120},{"id":"IPR011992","name":"EF-hand domain pair","type":"homologous_superfamily","start":122,"end":220},{"id":"IPR043145","name":"Zinc finger, ZZ-type superfamily","type":"homologous_superfamily","start":216,"end":277},{"id":"IPR015153","name":"EF-hand domain, type 1","type":"domain","start":8,"end":118},{"id":"IPR015154","name":"EF-hand domain, type 2","type":"domain","start":124,"end":216},{"id":"IPR000433","name":"Zinc finger, ZZ-type","type":"domain","start":222,"end":279},{"id":"IPR050774","name":"KCMF1 and Dystrophin","type":"family","start":7,"end":307}],"reasoning":"I begin with the InterPro architecture. The N-terminal half is dominated by paired EF-hand modules: IPR011992 (EF-hand domain pair, residues 8–120) and IPR011992 (EF-hand domain pair, residues 122–220) encompass two tandem EF-hand cassettes. Within these, IPR015153 (EF-hand domain, type 1, residues 8–118) and IPR015154 (EF-hand domain, type 2, residues 124–216) specify canonical Ca2+-binding folds that typically undergo Ca2+-triggered conformational switching. Immediately downstream, the C-terminal region carries a ZZ-type zinc finger: IPR043145 (Zinc finger, ZZ-type superfamily, residues 216–277) and its specific instance IPR000433 (Zinc finger, ZZ-type, residues 222–279). The ZZ module is a small, cross-braced metal-binding fold that often mediates protein–protein interactions and cytoskeletal or membrane-proximal scaffolding. The entire polypeptide is classified by IPR050774 (KCMF1 and Dystrophin family, residues 7–307), a family that includes dystrophin/dystrobrevin-like scaffolds that assemble membrane-associated complexes.\n\nThis ordered layout—tandem EF-hand pairs followed by a ZZ-type zinc finger—creates a Ca2+-responsive scaffold. The EF-hand pairs provide a Ca2+-sensing core that modulates binding affinity and oligomeric state, while the ZZ-type zinc finger supplies a high-affinity docking site for partner proteins and cytoskeletal assemblies. Such an architecture inherently promotes multivalent complex formation rather than catalysis, which causally supports GO:0005515 protein binding as the molecular function.\n\nA Ca2+-regulated scaffold of the dystrophin-family lineage is well suited to control cytoskeletal organization and membrane–cytoskeleton coupling during neuronal development. By tuning adhesion and actin-associated assemblies in response to Ca2+ signals, the protein can steer neurite extension and cytoskeletal remodeling that define neuronal lineage progression. This mechanistic role aligns with GO:0030182 neuron differentiation as the biological process.\n\nThe absence of transmembrane segments and the presence of dystrophin-family features indicate a peripheral, membrane-proximal role rather than an integral membrane protein. The ZZ finger and EF-hand scaffold typically anchor to membrane-associated complexes, consistent with a soluble pool that dynamically associates with the cell surface. This supports a soluble cytoplasmic localization and a membrane-proximal pool at the cell periphery, matching GO:0005886 plasma membrane as a key cellular component.\n\nMechanistically, I hypothesize that Ca2+ binding to the EF-hand pairs induces conformational changes that regulate assembly of dystrophin/dystrobrevin-like complexes at the plasma membrane. The ZZ-type zinc finger likely stabilizes interactions with cytoskeletal adaptors and membrane-associated partners. In neurons, this would coordinate adhesion and actin dynamics to drive differentiation. Likely partners include dystrophin/dystrobrevin scaffolds and dystroglycan-associated assemblies, which together position the complex at membrane–cytoskeleton junctions and tune neurite morphogenesis.","category":"dark","control_evaluation":null,"validation_plan":null,"structure":{"source":"AlphaFold DB","pdb":"/structures/AF-A2CJ06.pdb","alphafold":"https://alphafold.ebi.ac.uk/entry/A2CJ06"},"links":{"uniprot":"https://www.uniprot.org/uniprotkb/A2CJ06/entry","atlas":"/p/A2CJ06"},"provenance":{"model":"BioReason-Pro (ESM3 esm3-sm-open-v1)","source_list":"Pharos Tdark","note":"AI prediction, not experimentally verified"}}