Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

ChainsTypeFamily Name Domain Identifier Family IdentifierProvenance Source (Version)
ASCOP2B SuperfamilyNucleotidylyl transferase 8034591 3001541 SCOP2B (2022-06-29)
BSCOP2B SuperfamilyNucleotidylyl transferase 8034591 3001541 SCOP2B (2022-06-29)

Domain Annotation: ECOD Classification ECOD Database Homepage

ChainsFamily NameDomain Identifier ArchitecturePossible HomologyHomologyTopologyFamilyProvenance Source (Version)
ACTP_transf_like_1e1b6tA1 A: a/b three-layered sandwichesX: HUP domain-likeH: HUP domains (From Topology)T: HUP domainsF: CTP_transf_like_1ECOD (1.6)
BCTP_transf_like_1e1b6tB1 A: a/b three-layered sandwichesX: HUP domain-likeH: HUP domains (From Topology)T: HUP domainsF: CTP_transf_like_1ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

ChainDomainClassArchitectureTopologyHomologyProvenance Source (Version)
A3.40.50.620 Alpha Beta 3-Layer(aba) Sandwich Rossmann fold HUPsCATH (4.3.0)
B3.40.50.620 Alpha Beta 3-Layer(aba) Sandwich Rossmann fold HUPsCATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

ChainsAccessionNameDescriptionCommentsSource
A, B
PF01467Cytidylyltransferase-like (CTP_transf_like)Cytidylyltransferase-likeThis family includes: Cholinephosphate cytidylyltransferase Swiss:P49585; glycerol-3-phosphate cytidylyltransferase Swiss:P27623. It also includes putative adenylyltransferases, and FAD synthases.Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

ChainsPolymerMolecular FunctionBiological ProcessCellular Component
A, B
PROTEIN (PHOSPHOPANTETHEINE ADENYLYLTRANSFERASE)

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

ChainsEnzyme NameDescriptionCatalytic Residues
pantetheine-phosphate adenylyltransferase  M-CSA #299

Phosphopantetheine adenylyltransferase (PPAT), isolated from Escherichia coli, catalyses the magnesium-dependent adenylyl transfer from ATP to 4'-phosphopantetheine (Ppant or PhP) to form dephospho-CoA (dPCoA). This reaction is the penultimate step in the synthesis of CoA. PPAT belongs to the nucleotidyltransferase alpha/beta phosphodiesterase superfamily, whose members catalyse the transfer of a nucleotide monophosphate to a substrate by stabilising the transition state of the reaction.

PPAT is a hexamer consisting of two trimers. While each subunit possesses an active site, it appears that only the subunits of one trimer will catalyse the reaction at a given time. The reaction proceeds via a random bi-bi mechanism in that the order of the binding of ATP and Ppant is not fixed, nor is the release of dPCoA and pyrophosphate. CoA can regulate the activity of PPAT by binding to the PPAT.PPi complex, thus preventing the binding of a new Ppant substrate molecule.

Defined by 4 residues: HIS:A-18LYS:A-42ARG:A-91SER:A-129
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