IUBMB Enzyme Nomenclature


Accepted name: chlorophyllide a 31-hydratase

Reaction: (1) 3-devinyl-3-(1-hydroxyethyl)-chlorophyllide a = chlorophyllide a + H2O
(2) 3-deacetyl-3-(1-hydroxyethyl)-bacteriochlorophyllide a = 3-deacetyl-3-vinyl-bacteriochlorophyllide a + H2O

For diagram of reaction click here.

Other name(s): bchF (gene name)

Systematic name: chlorophyllide-a 31-hydro-lyase

Comments: The enzyme, together with EC, chlorophyllide-a reductase, and EC, bacteriochlorophyllide-a dehydrogenase, is involved in the conversion of chlorophyllide a to bacteriochlorophyllide a. The enzymes can act in multiple orders, resulting in the formation of different intermediates, but the final product of the cumulative action of the three enzymes is always bacteriochlorophyllide a. The enzyme catalyses the hydration of a vinyl group on ring A, converting it to a hydroxyethyl group.

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


1. Pudek, M.R. and Richards, W.R. A possible alternate pathway of bacteriochlorophyll biosynthesis in a mutant of Rhodopseudomonas sphaeroides. Biochemistry 14 (1975) 3132-3137. [PMID: 1080053]

2. Burke, D.H., Alberti, M. and Hearst, J.E. bchFNBH bacteriochlorophyll synthesis genes of Rhodobacter capsulatus and identification of the third subunit of light-independent protochlorophyllide reductase in bacteria and plants. J. Bacteriol. 175 (1993) 2414-2422. [PMID: 8385667]

3. Lange, C., Kiesel, S., Peters, S., Virus, S., Scheer, H., Jahn, D. and Moser, J. Broadened substrate specificity of 3-hydroxyethyl bacteriochlorophyllide a dehydrogenase (BchC) indicates a new route for the biosynthesis of bacteriochlorophyll a. J. Biol. Chem. 290 (2015) 19697-19709. [PMID: 26088139]

4. Harada, J., Teramura, M., Mizoguchi, T., Tsukatani, Y., Yamamoto, K. and Tamiaki, H. Stereochemical conversion of C3-vinyl group to 1-hydroxyethyl group in bacteriochlorophyll c by the hydratases BchF and BchV: adaptation of green sulfur bacteria to limited-light environments. Mol. Microbiol. 98 (2015) 1184-1198. [PMID: 26331578]

[EC created 2016]

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