Accepted name: bacteriochlorophyllide c C-71-hydroxylase
Reaction: 2 S-adenosyl-L-methionine + a bacteriochlorophyllide c + H2O = a bacteriochlorophyllide e + 2 5′-deoxyadenosine + 2 L-methionine (overall reaction)
(1a) S-adenosyl-L-methionine + a bacteriochlorophyllide c + H2O = a 7-(hydroxymethyl)bacteriochlorophyllide c + 5′-deoxyadenosine + L-methionine
(1b) S-adenosyl-L-methionine + a 7-(hydroxymethyl)bacteriochlorophyllide c + H2O = a 7-(dihydroxymethyl)bacteriochlorophyllide c + 5′-deoxyadenosine + L-methionine
(1c) a 7-(dihydroxymethyl)bacteriochlorophyllide c = a bacteriochlorophyllide e + H2O (spontaneous)
Other name(s): bciD (gene name)
Systematic name: bacteriochlorophyllide-c:S-adenosyl-L-methionine oxidoreductase (C-71-hydroxylating)
Comments: The enzyme, found in green sulfur bacteria (Chlorobiaceae), is a radical S-adenosyl-L-methionine (AdoMet) enzyme and contains a [4Fe-4S] cluster. It catalyses two consecutive hydroxylation reactions of the C-7 methyl group of bacteriochlorophyllide c to form a geminal diol intermediate that spontaneously dehydrates to produce the formyl group of bacteriochlorophyllide e.
1.  Harada, J., Mizoguchi, T., Satoh, S., Tsukatani, Y., Yokono, M., Noguchi, M., Tanaka, A. and Tamiaki, H. Specific gene bciD for C7-methyl oxidation in bacteriochlorophyll e biosynthesis of brown-colored green sulfur bacteria. PLoS One 8:e60026 (2013). [PMID: 23560066]
2.  Thweatt, J.L., Ferlez, B.H., Golbeck, J.H. and Bryant, D.A. BciD is a radical S-adenosyl-L-methionine (SAM) enzyme that completes bacteriochlorophyllide e biosynthesis by oxidizing a methyl group into a formyl group at C-7. J. Biol. Chem. 292 (2017) 1361–1373. [PMID: 27994052]
[EC created 2016, modified 2017]