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B6db activities: rhizomimosinase

Description mimosine ammonia-lyase (4.3.1.-)
Catalyzed reaction mimosine + H(2)O = 3-hydroxy-4-pyridone + pyruvate + NH(3)
Cofactor Pyridoxal-phosphate.
MidD has sequence similarities with aminotransferases, it is not an aminotransferase because it does not require a keto acid as the co-substrate in the degradation reaction. It is a pyridoxal-5'-phosphate (PLP)-dependent enzyme. The catalytic activity of MidD was found to be specific to mimosine. In addition to 3H4P, we also identified pyruvate and ammonia as other degradation products in equimolar quantities of the substrate used. The degradation of mimosine into a ring compound, 3H4P with the release of ammonia indicates that MidD of Rhizobium sp. strain TAL1145 is a CN lyase.
Organisms -Eubacteria


Links Enzyme (activities) rhizomimosinase
BRENDA (activities) rhizomimosinase
KEGG (pathways) rhizomimosinase
PLPMDB (PLP mutants) rhizomimosinase
References Articles on rhizomimosinase
last changed 2014/03/12 11:42

B6db activities