Manganous ions suppress photosynthesis gene expression in Rhodobacter sphaeroides

Horne I.M., Pemberton J.M. and McEwan A.G. (1998) Manganous ions suppress photosynthesis gene expression in Rhodobacter sphaeroides. Microbiology, 144 8: 2255-2261. doi:10.1099/00221287-144-8-2255

Author Horne I.M.
Pemberton J.M.
McEwan A.G.
Title Manganous ions suppress photosynthesis gene expression in Rhodobacter sphaeroides
Journal name Microbiology   Check publisher's open access policy
ISSN 1350-0872
Publication date 1998-01-01
Sub-type Article (original research)
DOI 10.1099/00221287-144-8-2255
Open Access Status Not yet assessed
Volume 144
Issue 8
Start page 2255
End page 2261
Total pages 7
Publisher Microbiology Society
Language eng
Subject 2404 Microbiology
Abstract The effect of manganous ions [Mn(II)] and ferrous ions [Fe(II)] on expression of photosynthesis genes in Rhodobacter sphaeroides was investigated. The presence of Mn(II) during phototrophic (anaerobic) and chemotrophic (aerobic) growth of R. sphaeroides caused a decrease in the amount of bacteriochlorophyll and carotenoid pigments which were synthesized and this was associated mainly with a decrease in the level of light-harvesting complex II. Mn(II) was shown to cause a decrease in expression of the puc operon, which encodes the polypeptides of light-harvesting complex II. Expression of the puc operon is controlled by the central repressor of photosynthesis gene expression, PpsR. In a ppsR mutant there was no effect of Mn(II) on photosynthesis gene expression. It is concluded that Mn(II) may act as a co-repressor in the action of PpsR or act via an as yet uncharacterized protein that interacts with PpsR. In contrast to the effects of Mn(II), Fe(II) was required for high levels of photosynthesis gene expression. This requirement for Fe(II) was shown to be related to the regulation of hemA, a gene under the control of the transcriptional regulator, FnrL. Mn(II) did not affect FnrL-dependent gene expression.
Keyword Gene expression
Manganous ion
Repressor PpsR
Rhodobacter sphaeroides
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: Scopus Import - Archived
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