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The puf operon region of Rhodobacter sphaeroides

  • Photosynthetic Bacteria
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Abstract

The puf operon of the purple nonsulfur photosynthetic bacterium, Rhodobacter sphaeroides, contains structural gene information for at least two functionally distinct bacteriochlorophyll-protein complexes (light harvesting and reaction center) which are present in a fixed ratio within the photosynthetic intracytoplasmic membrane. Two proximal genes (pufBA) specify subunits of a long wavelength absorbing (i.e., 875 nm) light harvesting complex which are present in the photosynthetic membrane in ≃15 fold excess relative to the reaction center subunits which are encoded by the pufLM genes. This review summarizes recent studies aimed at determining how expression of the R. sphaeroides puf operon region relates to the ratio of individual bacteriochlorophyll-protein complexes found within the photosynthetic membrane. These experiments indicate that puf operon expression may be regulated at the transcriptional, post-transcriptional, translation and post-translational levels. In addition, this review discusses the possible role(s) of newly identified loci upstream of pufB which may be involved in regulating either synthesis or assembly of individual bacteriochrlorophyll-protein complexes as well as the pufX gene, the most distal genetic element within the puf operon whose function is still unknown.

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  1. Patricia J. Kiley

    Present address: Biochemistry Department, University of Wisconsin, Henry Mall, 53706, Madison, WI, USA

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  1. Bactoriology Department, University of Wisconsin, 1550 Linden Drive, 53706, Madison, WI, USA

    Timothy J. Donohue

  2. Microbiology Department, University of Illinois, 61801, Urbana, IL, USA

    Patricia J. Kiley & Samuel Kaplan

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Donohue, T.J., Kiley, P.J. & Kaplan, S. The puf operon region of Rhodobacter sphaeroides . Photosynth Res 19, 39–61 (1988). https://doi.org/10.1007/BF00114568

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