Characterization of a light-responding trans-activator responsible for differentially controlling reaction center and light-harvesting-I gene expression in Rhodobacter capsulatus

Author:

Buggy J J1,Sganga M W1,Bauer C E1

Affiliation:

1. Department of Biology, Indiana University, Bloomington 47405.

Abstract

The purple nonsulfur photosynthetic bacterium Rhodobacter capsulatus regulates synthesis of its photosystem in response to two environmental stimuli, oxygen tension and light intensity. Here we describe the identification and characterization of the trans-acting regulatory gene hvrA, which we show is involved in differentially controlling reaction center and light-harvesting gene expression in response to alterations in light intensity. An hvrA mutant strain is shown to lack the capability to trans-activate light-harvesting-I and reaction center gene expression but retain normal light-harvesting-II and photopigment regulation, in response to a reduction in light intensity. As a consequence of altered expression, hvrA mutant strains exhibit reduced photosynthetic growth capabilities under dim-light conditions. The results of this study and additional studies indicate that regulated synthesis of the photosystem involves complex sets of overlapping regulatory circuits that differentially control photosystem gene expression in response to environmental stimuli such as oxygen tension and light intensity.

Publisher

American Society for Microbiology

Subject

Molecular Biology,Microbiology

Reference34 articles.

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2. Nucleotide sequence, organization and nature of protein products of the carotenoid biosynthesis gene cluster of Rhodobacter capsulatus;Armstrong G. A.;Mol. Gen. Genet.,1989

3. Bauer C. E. Regulation of photosynthesis gene expression. In R. E. Blankenship M. T. Madigan and C. E. Bauer (ed.) Anoxygenic photosynthetic bacteria in press. Kluwer Academic Publishers Dordrecht The Netherlands.

4. Control of photosystem genes in Rhodobacter capsulatus;Bauer C. E.;Trends Genet.,1993

5. The superoperonal organization of genes for pigment biosynthesis and reaction center proteins is a conserved feature in Rhodobacter capsulatus: analysis of overlapping bchB and puhA transcripts;Bauer C. E.;Mol. Gen. Genet.,1991

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