{"uniprot":"Q3MIX3","gene":"ADCK5","name":"Uncharacterized aarF domain-containing protein kinase 5","organism":"Homo sapiens (Human)","status":"dark","length":580,"sequence":"MWRPVQLCHFHSALLHSRQKPWPSPAVFFRRNVRGLPPRFSSPTPLWRKVLSTAVVGAPLLLGARYVMAEAREKRRMRLVVDGMGRFGRSLKVGLQISLDYWWCTNVVLRGVEENSPGYLEVMSACHQRAADALVAGAISNGGLYVKLGQGLCSFNHLLPPEYTRTLRVLEDRALKRGFQEVDELFLEDFQALPHELFQEFDYQPIAAASLAQVHRAKLHDGTSVAVKVQYIDLRDRFDGDIHTLELLLRLVEVMHPSFGFSWVLQDLKGTLAQELDFENEGRNAERCARELAHFPYVVVPRVHWDKSSKRVLTADFCAGCKVNDVEAIRSQGLAVHDIAEKLIKAFAEQIFYTGFIHSDPHPGNVLVRKGPDGKAELVLLDHGLYQFLEEKDRAALCQLWRAIILRDDAAMRAHAAALGVQDYLLFAEMLMQRPVRLGQLWGSHLLSREEAAYMVDMARERFEAVMAVLRELPRPMLLVLRNINTVRAINVALGAPVDRYFLMAKRAVRGWSRLAGATYRGVYGTSLLRHAKVVWEMLKFEVALRLETLAMRLTALLARALVHLSLVPPAEELYQYLET","function_summary":"A mitochondrion-localized assembly factor that uses an atypical kinase-like scaffold to organize protein complexes controlling mitochondrial dynamics. By acting as a multivalent binding hub rather than a classical enzyme, it coordinates effectors that shape organelle morphology, thereby promoting overall mitochondrial organization while restraining excessive fusion. Its nucleotide-tunable architecture likely stabilizes specific assemblies at the mitochondrial surface to fine-tune the balance between fusion and fission pathways.","plain_language":"ADCK5 has barely been studied. The model's best guess: A mitochondrion-localized assembly factor that uses an atypical kinase-like scaffold to organize protein complexes controlling mitochondrial dynamics. By acting as a multivalent binding hub rather than a classical enzyme, it coordinates effectors that shape organelle morphology, thereby promoting overall mitochondrial organization while restraining excessive fusion.","uniprot_summary":"Probable catalytically inactive kinase, which may be involved in mitochondrial membrane dynamics.","go_terms":{"molecular_function":[{"id":"GO:0005515","label":"protein binding"}],"biological_process":[{"id":"GO:0010635","label":"negative regulation of mitochondrial fusion"},{"id":"GO:0010822","label":"positive regulation of organelle organization"}],"cellular_component":[{"id":"GO:0005739","label":"mitochondrion"}]},"interpro":[{"id":"IPR011009","name":"Protein kinase-like domain superfamily","type":"homologous_superfamily","start":191,"end":414},{"id":"IPR045307","name":"ADCK1-like domain","type":"domain","start":169,"end":409},{"id":"IPR004147","name":"ABC1 atypical kinase-like domain","type":"domain","start":170,"end":414},{"id":"IPR051130","name":"Mitochondrial structure and function regulator","type":"family","start":82,"end":542}],"reasoning":"I begin with the InterPro architecture. The core of the protein is a protein kinase-like fold: IPR011009 (Protein kinase-like domain superfamily, residues 191–414) defines a bilobal N-lobe/C-lobe scaffold typical of eukaryotic kinases but often repurposed for regulatory binding rather than catalysis. This fold is elaborated by three overlapping signatures that specify its lineage and chemistry: IPR045307 (ADCK1-like domain, residues 169–409) and IPR004147 (ABC1 atypical kinase-like domain, residues 170–414) together mark the ABC1/ADCK clade of atypical kinases that bind ATP and use the kinase-like architecture as a nucleotide-tunable interaction module. The broader family assignment IPR051130 (Mitochondrial structure and function regulator, residues 82–542) extends well beyond the catalytic core, indicating that flanking regions contribute targeting and regulatory interfaces that tune mitochondrial dynamics. The ordered layout—an N-terminal region feeding into an extensive ABC1/ADCK atypical kinase-like core and capped by family-specific regulatory extensions—establishes a scaffold optimized for macromolecular assembly rather than classical phosphorylation.\n\nThis architecture causes a molecular function centered on multivalent protein binding (GO:0005515). The kinase-like superfamily (IPR011009) supplies a stable platform for docking partners, while the ADCK/ABC1 domains (IPR045307, IPR004147) typically lack the canonical catalytic constellation yet retain nucleotide-binding grooves that allosterically regulate complex assembly. The family-level mitochondrial regulator signature (IPR051130) further supports a role as an assembly hub rather than an enzyme, consistent with a primary function of binding and organizing effectors of mitochondrial dynamics.\n\nFrom this binding-centric mechanism, the biological process emerges. The ABC1/ADCK scaffold is well-suited to coordinate membrane-associated machineries that shape mitochondrial morphology. By stabilizing or sequestering effectors, the protein can tune the balance between fusion and fission pathways. Its assembly role explains how it can both promote and restrain organelle remodeling: it positively regulates overall mitochondrion organization (GO:0010822) while specifically dampening the fusion axis when required, thereby effectuating negative regulation of mitochondrial fusion (GO:0010635). Such bidirectional control is a hallmark of mitochondrial dynamics regulators that gate access to outer-membrane remodeling factors.\n\nThe cellular context follows directly. The mitochondrial regulator family signature (IPR051130) and the absence of secretion signals point to an intramitochondrial role. The experimentally supported location is the mitochondrion (GO:0005739), aligning with the need to interface with membrane-associated assemblies that govern cristae and outer-membrane architecture.\n\nMechanistically, I hypothesize that the ABC1/ADCK core binds ATP to stabilize conformations that recruit and position partner proteins at the mitochondrial surface. By assembling modules that impinge on outer-membrane remodeling, it can bias the network toward fission or restrained fusion. Likely partners include outer-membrane fusion and fission effectors and their adaptors: mitofusin complexes that drive fusion, and DRP1 recruitment machinery that promotes fission. Additional associations with co-regulatory ABC1/ADCK family members and inner–outer membrane tethers would provide the physical means to fine-tune mitochondrial organization from within the mitochondrial compartment.","category":"dark","control_evaluation":null,"validation_plan":null,"structure":{"source":"AlphaFold DB","pdb":"/structures/AF-Q3MIX3.pdb","alphafold":"https://alphafold.ebi.ac.uk/entry/Q3MIX3"},"links":{"uniprot":"https://www.uniprot.org/uniprotkb/Q3MIX3/entry","atlas":"/p/Q3MIX3"},"provenance":{"model":"BioReason-Pro (ESM3 esm3-sm-open-v1)","source_list":"Pharos Tdark","note":"AI prediction, not experimentally verified"}}