{"uniprot":"Q8WVC6","gene":"DCAKD","name":"Dephospho-CoA kinase domain-containing protein","organism":"Homo sapiens (Human)","status":"dark","length":231,"sequence":"MFLVGLTGGIASGKSSVIQVFQQLGCAVIDVDVMARHVVQPGYPAHRRIVEVFGTEVLLENGDINRKVLGDLIFNQPDRRQLLNAITHPEIRKEMMKETFKYFLRGYRYVILDIPLLFETKKLLKYMKHTVVVYCDRDTQLARLMRRNSLNRKDAEARINAQLPLTDKARMARHVLDNSGEWSVTKRQVILLHTELERSLEYLPLRFGVLTGLAAIASLLYLLTHYLLPYA","function_summary":"A soluble human kinase that completes coenzyme A biosynthesis by using ATP to phosphorylate dephospho-CoA, thereby supplying coenzyme A for central acyl-transfer reactions. Its nucleotide-binding core drives phosphoryl transfer, and its propensity for protein interactions likely organizes pathway enzymes into transient assemblies. By operating near membrane-associated metabolic hubs, it channels acyl-group flux and supports energy and lipid metabolism despite lacking transmembrane segments.","plain_language":"DCAKD has barely been studied. The model's best guess: A soluble human kinase that completes coenzyme A biosynthesis by using ATP to phosphorylate dephospho-CoA, thereby supplying coenzyme A for central acyl-transfer reactions. Its nucleotide-binding core drives phosphoryl transfer, and its propensity for protein interactions likely organizes pathway enzymes into transient assemblies.","uniprot_summary":"Involved in the biosynthesis of coenzyme A.","go_terms":{"molecular_function":[{"id":"GO:0005515","label":"protein binding"}],"biological_process":[{"id":"GO:0015937","label":"coenzyme A biosynthetic process"}],"cellular_component":[{"id":"GO:0016020","label":"membrane"}]},"interpro":[{"id":"IPR027417","name":"P-loop containing nucleoside triphosphate hydrolase","type":"homologous_superfamily","start":1,"end":203},{"id":"IPR001977","name":"Dephospho-CoA kinase","type":"family","start":1,"end":207}],"reasoning":"I begin with the InterPro architecture. The sequence is fully encompassed by IPR027417 (P-loop containing nucleoside triphosphate hydrolase homologous superfamily, residues 1–203), indicating a classical NTP-binding fold that stabilizes phosphate groups and coordinates divalent cations to catalyze phosphoryl transfer. This scaffold is reinforced and specialized by IPR001977 (Dephospho-CoA kinase family, residues 1–207), which defines the enzyme class that converts dephospho-CoA to coenzyme A via ATP-dependent phosphorylation. The coextensive coverage of both signatures across essentially the entire polypeptide establishes a soluble, ATP-driven kinase core that binds nucleotides and positions the dephospho-CoA substrate for in-line transfer to the 3′-phosphate of the adenosine moiety. This architecture causes ATP binding and hydrolysis-coupled chemistry typical of P-loop NTPases and assigns the catalytic identity of a dephospho-CoA kinase.\n\nFrom this domain logic, the molecular function resolves into two facets. First, the P-loop NTPase core and dephospho-CoA kinase family membership specify an ATP-dependent phosphotransferase that executes the terminal step of the coenzyme A pathway. Second, the absence of transmembrane segments and the soluble kinase fold imply that multivalent contacts with other proteins are used for regulation and assembly, consistent with GO:0005515 protein binding. Such binding capacity is expected for a pathway terminal enzyme that often forms transient complexes with upstream and downstream biosynthetic partners.\n\nThe catalytic role directly situates the protein in coenzyme A biogenesis. By generating coenzyme A, it completes the pathway formalized as GO:0015937 coenzyme A biosynthetic process. This terminal step is pivotal because coenzyme A is required for acyl transfer reactions in central metabolism and lipid synthesis; thus, the enzyme’s activity feeds into mitochondrial energy production and cytosolic acylation pathways.\n\nCellular placement follows from the soluble kinase architecture and pathway context. The lack of transmembrane domains supports a soluble pool, yet the functional coupling of acetyl-CoA production and utilization frequently anchors CoA pathway enzymes to intracellular membranes. This creates a mechanistic rationale for GO:0016020 membrane: transient or peripheral association with membrane surfaces can concentrate pathway flux near sites of acyl-group exchange and energy transduction. Such membrane-proximal positioning can be achieved through protein-mediated tethering rather than integral membrane insertion, aligning with a soluble enzyme that operates at membrane interfaces.\n\nMechanistically, the enzyme likely binds ATP and Mg2+ within the P-loop pocket, aligns dephospho-CoA in the family-defined active site, and executes a phosphoryl transfer that yields coenzyme A and ADP. It probably forms assemblies with other CoA-pathway enzymes to channel intermediates and with membrane-associated metabolic hubs, explaining both its protein-binding propensity and membrane association. I hypothesize interactions with upstream CoA-biosynthetic enzymes and with membrane-proximal acetyl-CoA–utilizing complexes, enabling efficient substrate handoff and spatial control of acyl-group flux.","category":"dark","control_evaluation":null,"validation_plan":null,"structure":{"source":"AlphaFold DB","pdb":"/structures/AF-Q8WVC6.pdb","alphafold":"https://alphafold.ebi.ac.uk/entry/Q8WVC6"},"links":{"uniprot":"https://www.uniprot.org/uniprotkb/Q8WVC6/entry","atlas":"/p/Q8WVC6"},"provenance":{"model":"BioReason-Pro (ESM3 esm3-sm-open-v1)","source_list":"Pharos Tdark","note":"AI prediction, not experimentally verified"}}