Studies on the signal transduction cascades responsible for the control of the expression of NiFe hydrogenases and photosynthetic apparatus in purple sulfur photosynthetic bacteria

摘要

The photosynthesis and hydrogen metabolism play important role in the energy metabolism of photosynthetic bacteria. If they are energetically linked, the expression of their components should be regulated by common factors. A pigment mutant strain of the purple sulfur photosynthetic bacterium, Thiocapsa roseopersicina BBS was isolated by plasposon mutagenesis. About 19 orf-s, most of which are thought to be genes involved in the biosynthesis of carotenoids, bacteriochlorophyll and photosynthetic reaction centre were identified surrounding the plasposon in a 22 kb long chromosomal locus. The carotenoid biosynthetic genes, crtDC and crtE genes were shown to be regulated by oxygen,