Control of photosystem genes in Rhodobacter capsulatus

Trends Genet. 1993 Feb;9(2):56-60. doi: 10.1016/0168-9525(93)90188-N.

Abstract

Two environmental factors, oxygen and high light intensity, are known to repress synthesis of the Rhodobacter capsulatus photosystem. One level of regulation is the control of light harvesting and reaction centre gene expression at the point of transcription initiation. This has recently been shown to involve transcriptional activators which exhibit sequence similarity to members of the 'two-component' class of prokaryotic regulators. An additional level of regulation involves the formation of 'superoperons' that transcriptionally link pigment biosynthesis operons with operons that code for the light harvesting and reaction centre structural genes. A final level of regulation involves the selective degradation of reaction centre mRNA transcripts which influence the stoichiometric synthesis of the light harvesting and reaction centre complexes.

Publication types

  • Comparative Study
  • Research Support, U.S. Gov't, Non-P.H.S.
  • Research Support, U.S. Gov't, P.H.S.
  • Review

MeSH terms

  • Anaerobiosis
  • Bacteriochlorophylls / biosynthesis
  • Bacteriochlorophylls / genetics
  • Base Sequence
  • Carotenoids / biosynthesis
  • Consensus Sequence
  • Gene Expression Regulation, Bacterial*
  • Genes, Bacterial
  • Light
  • Light-Harvesting Protein Complexes
  • Molecular Sequence Data
  • Operon
  • Photosynthesis / genetics*
  • Photosynthetic Reaction Center Complex Proteins / genetics*
  • Photosynthetic Reaction Center Complex Proteins / radiation effects
  • Promoter Regions, Genetic
  • RNA Processing, Post-Transcriptional
  • Rhodobacter capsulatus / genetics*
  • Rhodobacter capsulatus / physiology
  • Rhodobacter capsulatus / radiation effects
  • Sequence Alignment
  • Sequence Homology, Nucleic Acid
  • Transcription, Genetic

Substances

  • Bacteriochlorophylls
  • Light-Harvesting Protein Complexes
  • Photosynthetic Reaction Center Complex Proteins
  • Carotenoids