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. 1984 Jun;158(3):1094–1103. doi: 10.1128/jb.158.3.1094-1103.1984

Plasmid rearrangements in the photosynthetic bacterium Rhodopseudomonas sphaeroides.

F E Nano, S Kaplan
PMCID: PMC215555  PMID: 6327628

Abstract

Mu d1(Ap lac) was introduced into the photosynthetic bacterium Rhodopseudomonas sphaeroides 2.4.1. via the R-plasmid R751 in an attempt to isolate fusion derivatives involving photosynthetic operons. The selection system is potentially very powerful since R. sphaeroides is normally Lac negative. Among the exconjugants, photosynthesis-deficient mutants were recovered, some of which had elevated beta-galactosidase levels. Among the mutants examined, beta-galactosidase expression was linked exclusively to R751 . Many of the photosynthesis-deficient mutants were found to have alterations in their indigenous plasmids which apparently involved the exchange of DNA from one plasmid to another. Southern blot analysis revealed that there are extensive DNA sequences which are shared by the two plasmids that are involved in the rearrangements and that no exogenous DNA sequences appear to be involved. It was further discovered that plasmid rearrangement is a general phenomenon which can occur spontaneously in R. sphaeroides 2.4.1 and shows a high correlation with a photosynthesis minus phenotype.

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