Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

ChainsTypeFamily Name Domain Identifier Family IdentifierProvenance Source (Version)
ASCOP2B SuperfamilyClass II aaRS and biotin synthetases 8002576 3000058 SCOP2B (2022-06-29)
ASCOP2B SuperfamilyWinged helix DNA-binding domain 8002573 3000034 SCOP2B (2022-06-29)
ASCOP2B SuperfamilyTranscriptional regulator domain 8002578 3000121 SCOP2B (2022-06-29)

Domain Annotation: ECOD Classification ECOD Database Homepage

ChainsFamily NameDomain Identifier ArchitecturePossible HomologyHomologyTopologyFamilyProvenance Source (Version)
ABPL_Ce1bibA1 A: beta barrelsX: SH3H: SH3T: SH3F: BPL_CECOD (1.6)
AHTH_11e1bibA2 A: alpha arraysX: HTHH: HTHT: wingedF: HTH_11ECOD (1.6)
ABPL_LplA_LipBe1bibA3 A: a+b three layersX: Class II aaRS and biotin synthetases (From Topology)H: Class II aaRS and biotin synthetases (From Topology)T: Class II aaRS and biotin synthetasesF: BPL_LplA_LipBECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Protein Family Annotation Pfam Database Homepage

ChainsAccessionNameDescriptionCommentsSource
PF08279HTH domain (HTH_11)HTH domainThis family includes helix-turn-helix domains in a wide variety of proteins.Domain
PF03099Biotin/lipoate A/B protein ligase family (BPL_LplA_LipB)Biotin/lipoate A/B protein ligase familyThis family includes biotin protein ligase, lipoate-protein ligase A and B. Biotin is covalently attached at the active site of certain enzymes that transfer carbon dioxide from bicarbonate to organic acids to form cellular metabolites. Biotin prot ...This family includes biotin protein ligase, lipoate-protein ligase A and B. Biotin is covalently attached at the active site of certain enzymes that transfer carbon dioxide from bicarbonate to organic acids to form cellular metabolites. Biotin protein ligase (BPL) is the enzyme responsible for attaching biotin to a specific lysine at the active site of biotin enzymes. Each organism probably has only one BPL. Biotin attachment is a two step reaction that results in the formation of an amide linkage between the carboxyl group of biotin and the epsilon-amino group of the modified lysine [2]. Lipoate-protein ligase A (LPLA) catalyses the formation of an amide linkage between lipoic acid and a specific lysine residue in lipoate dependent enzymes [3]. The unusual biosynthesis pathway of lipoic acid is mechanistically intertwined with attachment of the cofactor [5].
Domain
PF02237Biotin protein ligase C terminal domain (BPL_C)Biotin protein ligase C terminal domainThe function of this structural domain is unknown. It is found to the C terminus of the biotin protein ligase catalytic domain Pfam:PF01317.Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

ChainsPolymerMolecular FunctionBiological ProcessCellular Component
BIR A

Structure Motif Annotation: Mechanism and Catalytic Site Atlas M-CSA Database Homepage

ChainsEnzyme NameDescriptionCatalytic Residues
biotin---[acetyl-CoA-carboxylase] ligase  M-CSA #538

The biotin operon repressor, biotin--[acetyl-CoA-carboxylase] ligase or BirA, is a 33.5-kDa protein. BirA is bifunctional, serving both as the biotin activating enzyme and as a transcriptional regulator. It catalyses the formation of biotinyl-5'-adenylate(bio-5'-AMP) from biotin and ATP and transfers biotin to a specific lysine residue on the biotin carboxyl carrier protein, a subunit of acetyl-CoA carboxylase. Bio-5'-AMP is also the corepressor of BirA.

Defined by 3 residues: ARG:A-118LYS:A-183ARG:A-317
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