Dihydrodipicolinate synthase
| 4-hydroxy-tetrahydrodipicolinate synthase | |||||||||
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| Identifiers | |||||||||
| EC number | 4.3.3.7 | ||||||||
| CAS number | Template:CAS | ||||||||
| Databases | |||||||||
| IntEnz | IntEnz view | ||||||||
| BRENDA | BRENDA entry | ||||||||
| ExPASy | NiceZyme view | ||||||||
| KEGG | KEGG entry | ||||||||
| MetaCyc | metabolic pathway | ||||||||
| PRIAM | profile | ||||||||
| PDB structures | RCSB PDB PDBe PDBsum | ||||||||
| Gene Ontology | AmiGO / EGO | ||||||||
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| Dihydrodipicolinate synthetase family | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| File:PDB 1xky EBI.jpg
Crystal structure of dihydrodipicolinate synthase dapa-2 (ba3935) from Bacillus anthracis at 1.94a resolution.
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| Identifiers | |||||||||
| Symbol | DHDPS | ||||||||
| Pfam | PF00701 | ||||||||
| Pfam clan | CL0036 | ||||||||
| InterPro | IPR002220 | ||||||||
| PROSITE | PDOC00569 | ||||||||
| SCOP | 1dhp | ||||||||
| SUPERFAMILY | 1dhp | ||||||||
| CDD | cd00950 | ||||||||
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4-hydroxy-tetrahydrodipicolinate synthase (EC 4.3.3.7, dihydrodipicolinate synthase, dihydropicolinate synthetase, dihydrodipicolinic acid synthase, L-aspartate-4-semialdehyde hydro-lyase (adding pyruvate and cyclizing), dapA (gene)) is an enzyme with the systematic name L-aspartate-4-semialdehyde hydro-lyase (adding pyruvate and cyclizing; (4S)-4-hydroxy-2,3,4,5-tetrahydro-(2S)-dipicolinate-forming).[1][2][3][4] This enzyme catalyses the following chemical reaction
- pyruvate + L-aspartate-4-semialdehyde
(2S,4S)-4-hydroxy-2,3,4,5-tetrahydrodipicolinate + H2O
The reaction proceeds in three consecutive steps.
Function
This enzyme belongs to the family of lyases, specifically the amine-lyases, which cleave carbon-nitrogen bonds. 4-hydroxy-tetrahydrodipicolinate synthase is the key enzyme in lysine biosynthesis via the diaminopimelate pathway of prokaryotes, some phycomycetes, and higher plants. The enzyme catalyses the condensation of L-aspartate-beta-semialdehyde and pyruvate to 4-hydroxy-tetrahydropicolinic acid via a ping-pong mechanism in which pyruvate binds to the enzyme by forming a Schiff base with a lysine residue.[5]
Related enzymes
Three other proteins are structurally related to this enzyme and probably also act via a similar catalytic mechanism. These are Escherichia coli N-acetylneuraminate lyase (EC 4.1.3.3) (protein NanA), which catalyses the condensation of N-acetyl-D-mannosamine and pyruvate to form N-acetylneuraminate; Rhizobium meliloti (Sinorhizobium meliloti) protein MosA,[6] which is involved in the biosynthesis of the rhizopine 3-O-methyl-scyllo-inosamine; and E. coli hypothetical protein YjhH.
Structure
The sequences of 4-hydroxy-tetrahydrodipicolinate synthase from different sources are well-conserved. The structure takes the form of a homotetramer, in which 2 monomers are related by an approximate 2-fold symmetry.[5] Each monomer comprises 2 domains: an 8-fold alpha-/beta-barrel, and a C-terminal alpha-helical domain. The fold resembles that of N-acetylneuraminate lyase. The active site lysine is located in the barrel domain, and has access via 2 channels on the C-terminal side of the barrel.
References
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Further reading
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External links
- 4-hydroxy-tetrahydrodipicolinate synthase at the US National Library of Medicine Medical Subject Headings (MeSH)
This article incorporates text from the public domain Pfam and InterPro IPR002220
