ENZYME entry: EC 1.21.98.3
| Accepted Name |
|---|
| Anaerobic magnesium-protoporphyrin IX monomethyl ester cyclase.
|
| Alternative Name(s) |
|---|
| MPE cyclase. |
| Reaction catalysed |
|---|
| Magnesium-protoporphyrin IX 13-monomethyl ester + 3 S-adenosyl-L-methionine + H(2)O <=> 3,8-divinyl protochlorophyllide a + 3 5'-deoxyadenosine + 3 L-methionine |
| Cofactor(s) |
|---|
| Adenosylcob(III)alamin; Iron-sulfur.
|
| Comment(s) |
|---|
- This radical AdoMet enzyme participates in the biosynthesis of
chlorophyllide a in anaerobic bacteria, catalyzing the formation of
an isocyclic ring.
- The same transformation is achieved in aerobic organisms by the
oxygen-dependent EC 1.14.13.81.
- Some facultative phototrophic bacteria, such as Rubrivivax
gelatinosus, possess both enzymes.
|
| Cross-references |
|---|
| BRENDA | 1.21.98.3 |
| EC2PDB | 1.21.98.3 |
| ExplorEnz | 1.21.98.3 |
| PRIAM enzyme-specific profiles | 1.21.98.3 |
| KEGG Ligand Database for Enzyme Nomenclature | 1.21.98.3 |
| IUBMB Enzyme Nomenclature | 1.21.98.3 |
| IntEnz | 1.21.98.3 |
| MEDLINE | Find literature relating to 1.21.98.3 |
| MetaCyc | 1.21.98.3 |
| Rhea expert-curated reactions | 1.21.98.3 |
| UniProtKB/Swiss-Prot |
|
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