IUBMB Enzyme Nomenclature


Accepted name: 3,8-divinyl protochlorophyllide a 8-vinyl-reductase (ferredoxin)

Reaction: protochlorophyllide a + 2 oxidized ferredoxin [iron-sulfur] cluster = 3,8-divinyl protochlorophyllide a + 2 reduced ferredoxin [iron-sulfur] cluster + 2 H+

For diagram of reaction click here.

Other name(s): bciB (gene name); cyano-type divinyl chlorophyllide a 8-vinyl-reductase

Systematic name: protochlorophyllide-a:ferredoxin C-81-oxidoreductase

Comments: The enzyme, found in many phototrophic bacteria, land plants, and some green and red algae, is involved in the production of monovinyl versions of (bacterio)chlorophyll pigments from their divinyl precursors. Binds two [4Fe-4S] clusters and an FAD cofactor. It can also act on 3,8-divinyl chlorophyllide a, 3,8-divinyl chlorophyll a, and chlorophyll c2. cf. EC, 3,8-divinyl protochlorophyllide a 8-vinyl-reductase (NADPH).

Links to other databases: BRENDA, EXPASY, KEGG, MetaCyc, CAS registry number:


1. Chew, A.G. and Bryant, D.A. Characterization of a plant-like protochlorophyllide a divinyl reductase in green sulfur bacteria. J. Biol. Chem. 282 (2007) 2967-2975. [PMID: 17148453]

2. Saunders, A.H., Golbeck, J.H. and Bryant, D.A. Characterization of BciB: a ferredoxin-dependent 8-vinyl-protochlorophyllide reductase from the green sulfur bacterium Chloroherpeton thalassium. Biochemistry 52 (2013) 8442-8451. [PMID: 24151992]

3. Ito, H. and Tanaka, A. Evolution of a new chlorophyll metabolic pathway driven by the dynamic changes in enzyme promiscuous activity. Plant Cell Physiol 55 (2014) 593-603. [PMID: 24399236]

[EC created 2016]

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