Chlorophyllide a reductase
Chlorophyllide a reductase, also known as COR, is an enzyme with systematic name bacteriochlorophyllide-a:ferredoxin 7,8-oxidoreductase. It catalyses the following chemical reaction
This reduction of the pyrrole ring B, gives the characteristic 18-electron aromatic system that distinguishes bacteriochlorophylls from chlorophylls, which retain the chlorin system of Chlorophyllide a.
This enzyme is present in purple bacteria such as Rhodobacter capsulatus and Rhodobacter sphaeroides, and proteobacteria. It is a component of the biosynthetic pathway to bacteriochlorophylls.
