A0A4Q3ZEP7 · A0A4Q3ZEP7_9PROT
- ProteinKetol-acid reductoisomerase
- GeneilvC
- StatusUniProtKB unreviewed (TrEMBL)
- Organism
- Amino acids312 (go to sequence)
- Protein existenceInferred from homology
- Annotation score3/5
Function
function
Involved in the biosynthesis of branched-chain amino acids (BCAA). Catalyzes an alkyl-migration followed by a ketol-acid reduction of (S)-2-acetolactate (S2AL) to yield (R)-2,3-dihydroxy-isovalerate. In the isomerase reaction, S2AL is rearranged via a Mg-dependent methyl migration to produce 3-hydroxy-3-methyl-2-ketobutyrate (HMKB). In the reductase reaction, this 2-ketoacid undergoes a metal-dependent reduction by NADPH to yield (R)-2,3-dihydroxy-isovalerate.
Catalytic activity
- (2R)-2,3-dihydroxy-3-methylbutanoate + NADP+ = (2S)-2-acetolactate + H+ + NADPH
Cofactor
Pathway
Amino-acid biosynthesis; L-isoleucine biosynthesis; L-isoleucine from 2-oxobutanoate: step 2/4.
Amino-acid biosynthesis; L-valine biosynthesis; L-valine from pyruvate: step 2/4.
Features
Showing features for binding site.
Type | ID | Position(s) | Description | |||
---|---|---|---|---|---|---|
Binding site | 190 | Mg2+ 1 (UniProtKB | ChEBI) | ||||
Sequence: D | ||||||
Binding site | 190 | Mg2+ 2 (UniProtKB | ChEBI) | ||||
Sequence: D | ||||||
Binding site | 194 | Mg2+ 1 (UniProtKB | ChEBI) | ||||
Sequence: E | ||||||
Binding site | 226 | Mg2+ 2 (UniProtKB | ChEBI) | ||||
Sequence: E | ||||||
Binding site | 230 | Mg2+ 2 (UniProtKB | ChEBI) | ||||
Sequence: E | ||||||
Binding site | 251 | substrate | ||||
Sequence: S |
GO annotations
Aspect | Term | |
---|---|---|
Cellular Component | cytosol | |
Molecular Function | isomerase activity | |
Molecular Function | ketol-acid reductoisomerase activity | |
Molecular Function | metal ion binding | |
Molecular Function | NADP binding | |
Biological Process | isoleucine biosynthetic process | |
Biological Process | valine biosynthetic process |
Keywords
- Molecular function
- Biological process
- Ligand
Enzyme and pathway databases
Names & Taxonomy
Protein names
- Recommended nameKetol-acid reductoisomerase
- EC number
Gene names
Organism names
- Organism
- Strain
- Taxonomic lineageBacteria > Pseudomonadota > Alphaproteobacteria
Accessions
- Primary accessionA0A4Q3ZEP7
Proteomes
Subcellular Location
UniProt Annotation
GO Annotation
Structure
Family & Domains
Features
Showing features for domain.
Type | ID | Position(s) | Description | |||
---|---|---|---|---|---|---|
Domain | 1-181 | KARI N-terminal Rossmann | ||||
Sequence: MKVYYDKDCDLSLIKGKQVTIVGYGSQGHAHAQNLNDSGVKVTVGLRKGGASWAKAEGAGLAVKEVADAVKSADVVMILLPDEQIANVYKKDVEPNIKQGASLVFAHGFNVHYGFVQPRADLDVWMVAPKAPGHTVRGTYTQGGGVPHLVAVHQDKTGKARDLALSYSMANGGGKAGIIET | ||||||
Domain | 182-312 | KARI C-terminal knotted | ||||
Sequence: NFREETETDLFGEQAVLCGGTVELIKAGFETLVEAGYAPEMAYFECLHELKLIVDLIYEGGIANMNYSISNNAEYGEYVTGPRVVTEETKKVMKQVLRDIQTGEYAKSFVLEAAAGQPALISRRRLNAEHQ |
Sequence similarities
Belongs to the ketol-acid reductoisomerase family.
Family and domain databases
Sequence
- Sequence statusFragment
- Length312
- Mass (Da)33,691
- Last updated2019-07-31 v1
- Checksum4665B386E3138184
Features
Showing features for non-terminal residue.
Type | ID | Position(s) | Description | |||
---|---|---|---|---|---|---|
Non-terminal residue | 312 | |||||
Sequence: Q |