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Review
. 1998 Jun;180(11):2801-9.
doi: 10.1128/JB.180.11.2801-2809.1998.

Control of photosystem formation in Rhodobacter sphaeroides

J Zeilstra-Ryalls  1 , M Gomelsky, J M Eraso, A Yeliseev, J O'Gara, S Kaplan
Affiliations
Review

Control of photosystem formation in Rhodobacter sphaeroides

J Zeilstra-Ryalls et al. J Bacteriol. 1998 Jun.
No abstract available

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Figures

FIG. 1
FIG. 1
Most of the PS genes are arranged in a cluster on chromosome I of R. sphaeroides 2.4.1 (83). This region of approximately 60 kb begins with the pufKBALMX operon and extends, in a clockwise direction, to the pucBAC operon, which is 18 kb downstream of puhA. The pufB and -A genes encode structural polypeptides of the LHI SC, the pufL and -M genes encode two of the three structural proteins of the RC, and the two structural polypeptides of the LHII SC are encoded by pucB and -A, respectively (reviewed in reference 44). The Q gene, located upstream of the puf operon, together with the pufK and pucC genes, are not part of the PS, nor is orf1696. The pufX gene product is required for PS competence (4); it facilitates light-driven cyclic electron transfer (23). Between pufKBALMX and puhA, the latter of which codes for the largest structural polypeptide of the RC, are genes encoding enzymes catalyzing the biosynthesis of Crt and Bchl (–3, 8, 9, 17, 52) and some genes that have a regulatory role in PS gene expression. Between puhA and the pucBAC operon is the cycA gene (19, 97), encoding the obligatory cytochrome c2 protein. In the related bacterium R. capsulatus, a similar arrangement of a portion of these genes extending from puf to puh (25), called the photosynthesis gene cluster, is present, and the DNA sequence of the entire R. capsulatus photosynthesis gene cluster has been determined (14). The PS gene cluster is defined as the region from 0 to 3,000 kbp on chromosome I of R. sphaeroides 2.4.1. In the text are presented the locations, in boldface, of those genes that map outside this cluster and are pertinent to the discussion presented here. For a detailed description of the above model of PS gene regulation, see the text. ALA, 5-Aminolevulinic acid.
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