B1VB59 · B1VB59_CITFR
- ProteinCobyrinate a,c-diamide synthase
- GenecbiA
- StatusUniProtKB unreviewed (TrEMBL)
- Organism
- Amino acids459 (go to sequence)
- Protein existenceInferred from homology
- Annotation score3/5
Function
function
Catalyzes the ATP-dependent amidation of the two carboxylate groups at positions a and c of cobyrinate, using either L-glutamine or ammonia as the nitrogen source.
Miscellaneous
The a and c carboxylates of cobyrinate are activated for nucleophilic attack via formation of a phosphorylated intermediate by ATP. CbiA catalyzes first the amidation of the c-carboxylate, and then that of the a-carboxylate.
Catalytic activity
- 2 ATP + cob(II)yrinate + 2 H2O + 2 L-glutamine = 2 ADP + cob(II)yrinate a,c diamide + 2 H+ + 2 L-glutamate + 2 phosphate
Cofactor
Pathway
Cofactor biosynthesis; adenosylcobalamin biosynthesis; cob(II)yrinate a,c-diamide from sirohydrochlorin (anaerobic route): step 10/10.
Features
Showing features for active site, site.
Type | ID | Position(s) | Description | |||
---|---|---|---|---|---|---|
Active site | 334 | Nucleophile | ||||
Sequence: C | ||||||
Site | 438 | Increases nucleophilicity of active site Cys | ||||
Sequence: H |
GO annotations
Aspect | Term | |
---|---|---|
Molecular Function | ATP binding | |
Molecular Function | cobyrinic acid a,c-diamide synthase activity | |
Biological Process | cobalamin biosynthetic process | |
Biological Process | glutamine metabolic process |
Keywords
- Molecular function
- Biological process
- Ligand
Enzyme and pathway databases
Names & Taxonomy
Protein names
- Recommended nameCobyrinate a,c-diamide synthase
- EC number
- Alternative names
Gene names
Organism names
- Organism
- Taxonomic lineageBacteria > Pseudomonadota > Gammaproteobacteria > Enterobacterales > Enterobacteriaceae > Citrobacter > Citrobacter freundii complex
Accessions
- Primary accessionB1VB59
Structure
Family & Domains
Features
Showing features for domain.
Type | ID | Position(s) | Description | |||
---|---|---|---|---|---|---|
Domain | 9-194 | CobQ/CobB/MinD/ParA nucleotide binding | ||||
Sequence: VLAGTGSGCGKTTVTLGLLSLLKKRGLRVQPCKVGPDYLDTGWHTAVCGTASRNLDSFMLPVPTLNALFREHMQHADIAVIEGVMGLYDGYGTDPNYCSTAAMAKQLGCPVILLVDGKAVSTSIAATVMGFQHFDPTLNIAGVIVNRVNSETHYQLLKVAIERYCAVPVLGYVPRMAGVALPERHL | ||||||
Domain | 253-444 | CobB/CobQ-like glutamine amidotransferase | ||||
Sequence: LAIADDEAFNFYYPDNITLLERTGLKIVRFSPLHDTCLPDCQMIWLGGGYPELHAAALARNIAMLNQLRAAHQQGVAIYAECGGLMYLGSSLEDSQGDTWLMADIIPGHSKMGKRLTRFGYCEAQAAQQTLLAAEGEVLRGHEFHYSDFTPETPAVMNCRKVRDGKTLQAWSGGWQVGNTFASYLHVHFAQR |
Domain
Comprises of two domains. The C-terminal domain contains the binding site for glutamine and catalyzes the hydrolysis of this substrate to glutamate and ammonia. The N-terminal domain is anticipated to bind ATP and cobyrinate and catalyzes the ultimate synthesis of the diamide product. The ammonia produced via the glutaminase domain is probably translocated to the adjacent domain via a molecular tunnel, where it reacts with an activated intermediate.
Sequence similarities
Belongs to the CobB/CbiA family.
Belongs to the CobB/CobQ family. CobQ subfamily.
Keywords
- Domain
Family and domain databases
Sequence
- Sequence statusComplete
- Length459
- Mass (Da)49,782
- Last updated2008-05-20 v1
- ChecksumD381FE981936382E