A3CRC6 · A3CRC6_STRSV
- ProteinInosine-5'-monophosphate dehydrogenase
- GeneguaB
- StatusUniProtKB unreviewed (TrEMBL)
- Amino acids493 (go to sequence)
- Protein existenceInferred from homology
- Annotation score3/5
Function
function
Catalyzes the conversion of inosine 5'-phosphate (IMP) to xanthosine 5'-phosphate (XMP), the first committed and rate-limiting step in the de novo synthesis of guanine nucleotides, and therefore plays an important role in the regulation of cell growth.
Catalytic activity
- IMP + NAD+ + H2O = XMP + NADH + H+
Cofactor
Activity regulation
Mycophenolic acid (MPA) is a non-competitive inhibitor that prevents formation of the closed enzyme conformation by binding to the same site as the amobile flap. In contrast, mizoribine monophosphate (MZP) is a competitive inhibitor that induces the closed conformation. MPA is a potent inhibitor of mammalian IMPDHs but a poor inhibitor of the bacterial enzymes. MZP is a more potent inhibitor of bacterial IMPDH.
Pathway
Purine metabolism; XMP biosynthesis via de novo pathway; XMP from IMP: step 1/1.
Features
Showing features for binding site, active site.
Type | ID | Position(s) | Description | ||
---|---|---|---|---|---|
Binding site | 253 | NAD+ (UniProtKB | ChEBI) | |||
Binding site | 253-255 | NAD+ (UniProtKB | ChEBI) | |||
Binding site | 303-305 | NAD+ (UniProtKB | ChEBI) | |||
Binding site | 305 | K+ (UniProtKB | ChEBI); ligand shared between two tetrameric partners; in other chain | |||
Binding site | 307 | K+ (UniProtKB | ChEBI); ligand shared between two tetrameric partners; in other chain | |||
Binding site | 308 | IMP (UniProtKB | ChEBI) | |||
Active site | 310 | Thioimidate intermediate | |||
Binding site | 310 | K+ (UniProtKB | ChEBI); ligand shared between two tetrameric partners; in other chain | |||
Binding site | 343-345 | IMP (UniProtKB | ChEBI) | |||
Binding site | 366-367 | IMP (UniProtKB | ChEBI) | |||
Binding site | 390-394 | IMP (UniProtKB | ChEBI) | |||
Active site | 406 | Proton acceptor | |||
Binding site | 421 | IMP (UniProtKB | ChEBI) | |||
Binding site | 475 | K+ (UniProtKB | ChEBI); ligand shared between two tetrameric partners | |||
Binding site | 476 | K+ (UniProtKB | ChEBI); ligand shared between two tetrameric partners | |||
Binding site | 477 | K+ (UniProtKB | ChEBI); ligand shared between two tetrameric partners | |||
GO annotations
Aspect | Term | |
---|---|---|
Molecular Function | IMP dehydrogenase activity | |
Molecular Function | metal ion binding | |
Molecular Function | nucleotide binding | |
Biological Process | GMP biosynthetic process | |
Biological Process | GTP biosynthetic process |
Keywords
- Molecular function
- Biological process
- Ligand
Enzyme and pathway databases
Names & Taxonomy
Protein names
- Recommended nameInosine-5'-monophosphate dehydrogenase
- EC number
- Short namesIMP dehydrogenase ; IMPD ; IMPDH
Gene names
Organism names
- Strain
- Taxonomic lineageBacteria > Bacillota > Bacilli > Lactobacillales > Streptococcaceae > Streptococcus
Accessions
- Primary accessionA3CRC6
Proteomes
Interaction
Structure
Family & Domains
Features
Showing features for domain.
Type | ID | Position(s) | Description | ||
---|---|---|---|---|---|
Domain | 97-155 | CBS | |||
Domain | 159-219 | CBS | |||
Sequence similarities
Belongs to the IMPDH/GMPR family.
Keywords
- Domain
Phylogenomic databases
Family and domain databases
Sequence
- Sequence statusComplete
- Length493
- Mass (Da)52,695
- Last updated2007-03-20 v1
- MD5 ChecksumA7FAF65177D7EB5DDD0C3AF8FDDAE329
Keywords
- Technical term
Sequence databases
Nucleotide Sequence | Protein Sequence | Molecule Type | Status | |
---|---|---|---|---|
CP000387 EMBL· GenBank· DDBJ | ABN45731.1 EMBL· GenBank· DDBJ | Genomic DNA |