A putative anaerobic coproporphyrinogen III oxidase in Rhodobacter sphaeroides. I. Molecular cloning, transposon mutagenesis and sequence analysis of the gene.
A mutant of Rhodobacter sphaeroides, N1, has been isolated which is incapable of photosynthetic growth and, instead of synthesizing bacteriochlorophyll, N1 excretes coproporphyrin III into the growth medium. Using conjugative gene transfer, several clones were isolated from a R. sphaeroides gene library which restored normal pigment synthesis and photosynthetic growth to N1. Using transposon Tn5 mutagenesis, the gene was located to a 1.05 kb EcoRI fragment. Sequence and transcription analysis defined the position and expression of an open reading frame of approximately 920 bp, which is proposed as the anaerobic coproporphyrinogen III oxidase dedicated to bacteriochlorophyll biosynthesis.
Coomber
S A
SA
School of Biological Sciences, Queen Mary and Westfield College, University of London, UK.
Jones
R M
RM
Jordan
P M
PM
Hunter
C N
CN
D000595:Amino Acid Sequence; D001483:Base Sequence; D003001:Cloning, Molecular; D003304:Coproporphyrinogen Oxidase / Q000235:genetics*; D004251:DNA Transposable Elements; D005798:Genes, Bacterial / Q000235:genetics*; D008969:Molecular Sequence Data; D016254:Mutagenesis, Insertional; D009154:Mutation / Q000235:genetics / Q000502:physiology*; D016366:Open Reading Frames / Q000235:genetics; D011994:Recombinant Proteins / Q000235:genetics; D012242:Rhodobacter sphaeroides / Q000201:enzymology / Q000235:genetics*; D017422:Sequence Analysis, DNA
D004251:DNA Transposable Elements; D011994:Recombinant Proteins; D003304:Coproporphyrinogen Oxidase