HMM Summary Page: TIGR02019

Functionbacteriochlorophyll 4-vinyl reductase
Gene SymbolbchJ
Trusted Cutoff74.30
Domain Trusted Cutoff74.30
Noise Cutoff28.80
Domain Noise Cutoff28.80
Isology Typeequivalog
HMM Length188
Mainrole CategoryBiosynthesis of cofactors, prosthetic groups, and carriers
Subrole CategoryChlorophyll and bacteriochlorphyll
Gene Ontology TermGO:0003824: catalytic activity molecular_function
GO:0015995: chlorophyll biosynthetic process biological_process
AuthorSelengut J
Entry DateOct 15 2003 9:14AM
Last ModifiedFeb 14 2011 3:27PM
CommentThis HMM represents the component of bacteriochlorophyll synthetase responsible for reduction of the B-ring pendant ethylene (4-vinyl) group. It appears that this step must precede the reduction of ring D, at least by the "dark" protochlorophyllide reductase enzymes BchN, BchB and BchL [1]. This family appears to be present in photosynthetic bacteria except for the cyanobacterial clade. Cyanobacteria must use a non-orthologous gene to carry out this required step for the biosynthesis of both bacteriochlorophyll and chlorophyll.
ReferencesRN [1] RM PMID: 7876113 RT Altered monovinyl and divinyl protochlorophyllide pools in bchJ mutants of Rhodobacter capsulatus. Possible monovinyl substrate discrimination of light-independent protochlorophyllide reductase. RA Suzuki JY, Bauer CE. RL J Biol Chem. 1995 Feb 24;270(8):3732-40.
Genome PropertyGenProp0144: chlorophyllide a biosynthesis from protoporphyrin IX (HMM)