{"uniprot":"Q9UPV7","gene":"PHF24","name":"PHD finger protein 24","organism":"Homo sapiens (Human)","status":"dark","length":400,"sequence":"MGVLMSKRQTVEQVQKVSLAVSAFKDGLRDRPSIRRTGELPGSRRGTVEGSVQEVQEEKEAEAGTSVVQEESSAGRAAWERLRDGRGVEPEEFDRTSRFTPPAFIRPTRKLDDDKPPEICLEPREPVVNDEMCDVCEVWTAESLFPCRVCTRVFHDGCLRRMGYIQGDSAAEVTEMAHTETGWSCHYCDNINLLLTEEEMYSLTETFQRCKVIPDCSLTLEDFLRYRHQAAKRGDRDRALSEEQEEQAARQFAALDPEHRGHIEWPDFLSHESLLLLQQLRPQNSLLRLLTVKERERARAAFLARGSGSTVSEAECRRAQHSWFCKRFPEAPSCSVSISHVGPIADSSPASSSSKSQDKTLLPTEQESRFVDWPTFLQENVLYILAARPNSAAIHLKPPG","function_summary":"A nucleoplasmic scaffold that organizes protein assemblies controlling neuronal morphogenesis. Its central zinc-finger module builds multivalent interfaces for chromatin-associated complexes, while a downstream EF-hand pair confers calcium-responsive regulation. By coupling nuclear complex assembly to calcium signals, it modulates gene-expression programs that guide neurite initiation and outgrowth and coordinates broader pathways that influence intracellular transport during neural development.","plain_language":"PHF24 has barely been studied. The model's best guess: A nucleoplasmic scaffold that organizes protein assemblies controlling neuronal morphogenesis. Its central zinc-finger module builds multivalent interfaces for chromatin-associated complexes, while a downstream EF-hand pair confers calcium-responsive regulation.","uniprot_summary":"May be involved in neuron development.","go_terms":{"molecular_function":[{"id":"GO:0005515","label":"protein binding"}],"biological_process":[{"id":"GO:0006886","label":"intracellular protein transport"},{"id":"GO:0006605","label":"protein targeting"},{"id":"GO:0010975","label":"regulation of neuron projection development"}],"cellular_component":[{"id":"GO:0005654","label":"nucleoplasm"}]},"interpro":[{"id":"IPR011011","name":"Zinc finger, FYVE/PHD-type","type":"homologous_superfamily","start":117,"end":203},{"id":"IPR013083","name":"Zinc finger, RING/FYVE/PHD-type","type":"homologous_superfamily","start":118,"end":204},{"id":"IPR011992","name":"EF-hand domain pair","type":"homologous_superfamily","start":195,"end":276},{"id":"IPR031946","name":"KIAA1045, RING finger","type":"domain","start":126,"end":198},{"id":"IPR019786","name":"Zinc finger, PHD-type, conserved site","type":"conserved_site","start":133,"end":188}],"reasoning":"I begin with the InterPro architecture. The central region from residues 117–203 is densely annotated with zinc-finger superfamilies: IPR011011 (Zinc finger, FYVE/PHD-type homologous_superfamily, 117–203) and IPR013083 (Zinc finger, RING/FYVE/PHD-type homologous_superfamily, 118–204). Nested within this core lies IPR031946 (KIAA1045, RING finger, 126–198) and a PHD-finger hallmark IPR019786 (Zinc finger, PHD-type, conserved site, 133–188). This layered annotation indicates a RING-type zinc-finger module that often mediates both chromatin-reader functions and E3 ubiquitin ligase chemistry, with the PHD/RING fold providing a versatile scaffold for protein–protein interactions and chromatin-associated assemblies. Downstream, residues 195–276 form IPR011992 (EF-hand domain pair homologous_superfamily), a calcium-binding module that typically tunes conformation and binding affinity in response to Ca2+. The ordered layout—an N-to-C transition from a chromatin-interacting RING/PHD core to a Ca2+-responsive EF-hand pair—creates a regulatory platform that couples nuclear complex assembly to calcium-modulated dynamics.\n\nThis architecture dictates molecular function. The RING/PHD zinc-finger ensemble (IPR011011, IPR013083, IPR031946, IPR019786) generates multivalent interfaces that favor complex assembly over catalysis, and the EF-hand pair (IPR011992) adds a tunable interaction surface. Together they cause robust protein–protein association rather than enzymatic turnover, aligning with GO:0005515 protein binding as the primary molecular function.\n\nFrom function to process, a RING/PHD-centered scaffold in the nucleus naturally organizes transcriptional and chromatin-associated assemblies that influence neuronal morphogenesis. Such assemblies can modulate gene-expression programs that steer neurite initiation and elongation, matching GO:0010975 regulation of neuron projection development. The EF-hand pair provides a calcium-sensitive switch that can couple activity-dependent Ca2+ signaling to nuclear complex assembly, thereby gating developmental outputs.\n\nCellular location follows directly. The absence of transmembrane segments and the presence of chromatin-associated zinc-finger modules point to a soluble nuclear role. The experimentally supported nuclear residence and the fine-grained GO:0005654 nucleoplasm assignment together indicate a nucleoplasmic scaffold that assembles and remodels nuclear complexes.\n\nMechanistically, I hypothesize that the RING/PHD core nucleates nucleoplasmic assemblies that regulate chromatin state and transcription, while the EF-hand pair tunes these assemblies in response to Ca2+ transients. This platform likely binds chromatin modifiers and transcriptional regulators to calibrate gene programs for neurite biology. In this framework, the protein’s partners would include chromatin-associated complexes and calcium-responsive nuclear factors—candidates such as histone-modifying assemblies and SWI/SNF-like remodelers—together with calcium-sensitive transcriptional regulators that coordinate neuronal differentiation and transport pathways indirectly tied to neurite development.","category":"dark","control_evaluation":null,"validation_plan":null,"structure":{"source":"AlphaFold DB","pdb":"/structures/AF-Q9UPV7.pdb","alphafold":"https://alphafold.ebi.ac.uk/entry/Q9UPV7"},"links":{"uniprot":"https://www.uniprot.org/uniprotkb/Q9UPV7/entry","atlas":"/p/Q9UPV7"},"provenance":{"model":"BioReason-Pro (ESM3 esm3-sm-open-v1)","source_list":"Pharos Tdark","note":"AI prediction, not experimentally verified"}}