{"uniprot":"Q9NQ03","gene":"SCRT2","name":"Transcriptional repressor scratch 2","organism":"Homo sapiens (Human)","status":"dark","length":307,"sequence":"MPRSFLVKKIKGDGFQCSGVPAPTYHPLETAYVLPGARGPPGDNGYAPHRLPPSSYDADQKPGLELAPAEPAYPPAAPEEYSDPESPQSSLSARYFRGEAAVTDSYSMDAFFISDGRSRRRRGGGGGDAGGSGDAGGAGGRAGRAGAQAGGGHRHACAECGKTYATSSNLSRHKQTHRSLDSQLARKCPTCGKAYVSMPALAMHLLTHNLRHKCGVCGKAFSRPWLLQGHMRSHTGEKPFGCAHCGKAFADRSNLRAHMQTHSAFKHYRCRQCDKSFALKSYLHKHCEAACAKAAEPPPPTPAGPAS","function_summary":"A human nuclear DNA-binding regulator that uses tandem zinc-finger modules to recognize specific genomic motifs and repress RNA polymerase II–driven transcription. By anchoring to target sites in the nucleoplasm, it likely recruits corepressor and chromatin-remodeling assemblies to reduce transcriptional output. Its primary activity is nuclear, with potential signal-coupled excursions that register near the cell periphery.","plain_language":"SCRT2 has barely been studied. The model's best guess: A human nuclear DNA-binding regulator that uses tandem zinc-finger modules to recognize specific genomic motifs and repress RNA polymerase II–driven transcription. By anchoring to target sites in the nucleoplasm, it likely recruits corepressor and chromatin-remodeling assemblies to reduce transcriptional output.","uniprot_summary":"May be involved in transcriptional regulation.","go_terms":{"molecular_function":[{"id":"GO:1990837","label":"sequence-specific double-stranded DNA binding"}],"biological_process":[{"id":"GO:0000122","label":"negative regulation of transcription by RNA polymerase II"}],"cellular_component":[{"id":"GO:0005654","label":"nucleoplasm"},{"id":"GO:0005886","label":"plasma membrane"}]},"interpro":[{"id":"IPR036236","name":"Zinc finger C2H2 superfamily","type":"homologous_superfamily","start":155,"end":208},{"id":"IPR036236","name":"Zinc finger C2H2 superfamily","type":"homologous_superfamily","start":212,"end":287},{"id":"IPR013087","name":"Zinc finger C2H2-type","type":"domain","start":155,"end":182},{"id":"IPR013087","name":"Zinc finger C2H2-type","type":"domain","start":186,"end":213},{"id":"IPR013087","name":"Zinc finger C2H2-type","type":"domain","start":212,"end":239},{"id":"IPR013087","name":"Zinc finger C2H2-type","type":"domain","start":240,"end":267},{"id":"IPR013087","name":"Zinc finger C2H2-type","type":"domain","start":268,"end":298}],"reasoning":"I begin with the InterPro architecture, which is dominated by tandem C2H2 zinc-finger modules arrayed across the central-to-C-terminal half of the protein. The superfamily signature IPR036236 (Zinc finger C2H2 superfamily, residues 155–208 and 212–287) blankets the multi-finger region, while multiple specific C2H2-type domains are nested within: IPR013087 (Zinc finger C2H2-type, residues 155–182, 186–213, 212–239, 240–267, and 268–298). This ordered series of C2H2 repeats creates a modular DNA-recognition surface that reads double-stranded DNA bases in a sequence-specific manner. The tandem arrangement causes high-affinity, high-specificity binding to defined promoter or enhancer motifs and typically confers transcriptional regulatory capacity rather than enzymatic activity.\n\nFrom this architecture, the molecular function resolves as sequence-specific double-stranded DNA binding (GO:1990837). C2H2 arrays specify target sites and stabilize occupancy at regulatory elements. Such occupancy commonly represses transcription by recruiting corepressor assemblies and histone-modifying enzymes. This mechanistic logic—site-specific DNA binding coupled to corepressor engagement—drives negative regulation of transcription by RNA polymerase II (GO:0000122). The tandem fingers provide the specificity; repression arises through effector recruitment and chromatin remodeling.\n\nCellular localization follows from function and architecture. DNA-targeting zinc-finger arrays operate in the nucleus, and the soluble, non-membranous nature of these domains points to the nucleoplasm (GO:0005654) as the operational compartment where chromatin-associated regulation occurs. A reported association with the plasma membrane (GO:0005886) can be reconciled by transient shuttling or peripheral tethering: transcription factors sometimes sample cytoplasmic signaling hubs or bind membrane-proximal scaffolds that relay signals to nuclear gene-regulatory programs. Thus, the primary residence is nucleoplasmic, with possible signal-coupled excursions that register at the cell periphery.\n\nMechanistically, the protein likely binds specific genomic motifs via its tandem C2H2 fingers and represses transcription by assembling corepressor complexes at RNA polymerase II-regulated promoters and enhancers. It plausibly recruits CtBP, TRIM28/KAP1, or NuRD/HDAC modules to deacetylate histones and compact chromatin, thereby reducing transcriptional output. Interaction partners are expected to include chromatin remodelers and transcriptional machinery; membrane-proximal signaling adaptors could transiently interface with the nuclear pool to coordinate repression with extracellular cues.","category":"dark","control_evaluation":null,"validation_plan":null,"structure":{"source":"AlphaFold DB","pdb":"/structures/AF-Q9NQ03.pdb","alphafold":"https://alphafold.ebi.ac.uk/entry/Q9NQ03"},"links":{"uniprot":"https://www.uniprot.org/uniprotkb/Q9NQ03/entry","atlas":"/p/Q9NQ03"},"provenance":{"model":"BioReason-Pro (ESM3 esm3-sm-open-v1)","source_list":"Pharos Tdark","note":"AI prediction, not experimentally verified"}}