{"uniprot":"Q53FD0","gene":"ZC2HC1C","name":"Zinc finger C2HC domain-containing protein 1C","organism":"Homo sapiens (Human)","status":"dark","length":456,"sequence":"MAGLQRLASHLPVGVMLPHNTTEAPGPHSAKQDSYEQGDSSQQSLKGHLRNNFQKQLLSNKELILDKVYTHPKWNTQTKARSYSYPHCTGISQQDPESDSQGQGNGLFYSSGPQSWYPKANNQDFIPFTKKRVGVDRAFPLKPMVHRKSCSTGEAGTDGDHNVYPRPPEPREFSSRNFGVRNQGNFSVVGTVLAATQAEKAVANFDRTEWVQIRRLEAAGESLEEEIRRKQILLRGKLKKTEEELRRIQTQKEQAKENENGELQKIILPRSRVKGNKSNTMYKPIFSPEFEFEEEFSRDRREDETWGRSQQNSGPFQFSDYRIQRLKRERLVASNNKIRDPVSEPSVEKFSPPSETPVGALQGSARNSSLSMAPDSSGSSGSIEEPQLGECSHCGRKFLSFRLERHSNICSRMRGSKRKVFDSSRARAKGTELEQYLNWKGPASAKAEPPQKSNWR","function_summary":"A cytoplasmic scaffold that assembles ribonucleoprotein complexes to stabilize transcripts through their 3′ untranslated regions. An internal coiled-coil promotes oligomerization and higher-order assembly, while a C-terminal zinc-knuckle module confers RNA and effector-binding specificity. By concentrating mRNA-stabilizing factors into cytoplasmic assemblies and dynamically enriching at centriolar satellites, it enhances mRNA persistence and supports localized post-transcriptional control near the centrosome.","plain_language":"ZC2HC1C has barely been studied. The model's best guess: A cytoplasmic scaffold that assembles ribonucleoprotein complexes to stabilize transcripts through their 3′ untranslated regions. An internal coiled-coil promotes oligomerization and higher-order assembly, while a C-terminal zinc-knuckle module confers RNA and effector-binding specificity.","uniprot_summary":"Involved in mRNA stability.","go_terms":{"molecular_function":[{"id":"GO:0005515","label":"protein binding"}],"biological_process":[{"id":"GO:0070935","label":"3'-UTR-mediated mRNA stabilization"}],"cellular_component":[{"id":"GO:0034451","label":"centriolar satellite"}]},"interpro":[{"id":"IPR063925","name":"ZC2HC1C, coiled-coil region","type":"domain","start":196,"end":262},{"id":"IPR049899","name":"Zinc finger, C2HC/C3H-type","type":"domain","start":387,"end":416},{"id":"IPR026104","name":"Zinc finger C2HC domain-containing protein 1C","type":"family","start":1,"end":456}],"reasoning":"I begin with the InterPro architecture. The sequence is encompassed by IPR026104 (Zinc finger C2HC domain-containing protein 1C family, residues 1–456), establishing membership in a conserved family whose hallmark is RNA-associated regulation. Within this scaffold sits IPR063925 (ZC2HC1C, coiled-coil region, residues 196–262), a classic oligomerization and scaffolding module that promotes higher-order assembly and avidity for macromolecular complexes. At the C-terminus lies IPR049899 (Zinc finger, C2HC/C3H-type, residues 387–416). C2HC/C3H “zinc knuckle” modules typically coordinate zinc to stabilize compact folds that bind single-stranded nucleic acids and recruit effector proteins. The ordered layout—an internal coiled-coil for assembly followed by a C-terminal C2HC/C3H RNA/protein-binding module—creates a bipartite platform that nucleates ribonucleoprotein complexes and confers multivalent protein-binding capacity.\n\nThis architecture dictates the molecular function. The coiled-coil drives self-association and assembly of ribonucleoprotein particles, while the C2HC/C3H zinc finger provides specificity and affinity toward RNA and RNA-binding factors. Such a composite scaffold naturally operates through multivalent contacts with other proteins, aligning with GO:0005515 protein binding as the operative molecular function.\n\nFrom this molecular function, the biological process follows. C2HC/C3H zinc knuckles frequently stabilize mRNA–protein assemblies and protect transcripts by recruiting stabilizers such as poly(A)-binding proteins and ELAV-like factors. By concentrating these effectors via the coiled-coil core and zinc-finger specificity, the protein promotes the persistence of transcripts through deadenylation and decay pathways. This causal chain—assembly of RNP complexes that shield 3′ ends and enhance persistence—maps to GO:0070935 3′-UTR-mediated mRNA stabilization.\n\nCellular placement is inferred from the assembly logic and known trafficking hubs. The presence of a coiled-coil scaffold and RNA-regulatory zinc finger suggests cytoplasmic function, consistent with a soluble RNP organizer. The explicit association with centriolar satellites—GO:0034451 centriolar satellite—indicates that a portion of the pool concentrates near the centrosome’s pericentriolar matrix. This pericentriolar hub often serves as a staging area for RNA transport and localized translation. Thus, the protein resides predominantly in the cytoplasm and dynamically partitions to centriolar satellites, positioning mRNA regulation adjacent to microtubule-organizing centers.\n\nMechanistically, I hypothesize that the coiled-coil region nucleates oligomers that seed cytoplasmic RNP granules. The C-terminal C2HC/C3H domain then confers RNA selectivity and recruits stabilizers, biasing assembly toward 3′-UTR-defined complexes that resist decay. Localization to centriolar satellites suggests a role in spatial mRNA control—potentially buffering transcripts near the centrosome to coordinate cytoskeletal dynamics and localized expression.\n\nLikely interaction partners follow from this model. The scaffold should bind RNA-binding effectors that mediate 3′-UTR-dependent stability (e.g., ELAVL1/HuR, PABPC1), core mRNP factors (e.g., hnRNPs), and centriolar satellite constituents (e.g., PCM1, CEP131) that anchor the assemblies. These contacts collectively explain cytoplasmic residence, centriolar satellite enrichment, and a mechanism centered on coiled-coil-driven oligomerization coupled to zinc-knuckle-mediated RNA/protein engagement.","category":"dark","control_evaluation":null,"validation_plan":null,"structure":{"source":"AlphaFold DB","pdb":"/structures/AF-Q53FD0.pdb","alphafold":"https://alphafold.ebi.ac.uk/entry/Q53FD0"},"links":{"uniprot":"https://www.uniprot.org/uniprotkb/Q53FD0/entry","atlas":"/p/Q53FD0"},"provenance":{"model":"BioReason-Pro (ESM3 esm3-sm-open-v1)","source_list":"Pharos Tdark","note":"AI prediction, not experimentally verified"}}