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- Title
PcrX, an sRNA derived from the 3′‐ UTR of the Rhodobacter sphaeroides puf operon modulates expression of puf genes encoding proteins of the bacterial photosynthetic apparatus.
- Authors
Eisenhardt, Katrin M.H.; Reuscher, Carina M.; Klug, Gabriele
- Abstract
Summary: Facultative phototrophic bacteria like Rhodobacter sphaeroides can produce ATP by anoxygenic photosynthesis, which is of advantage under conditions with limiting oxygen. However, the simultaneous presence of pigments, light and oxygen leads to the generation of harmful singlet oxygen. In order to avoid this stress situation, the formation of photosynthetic complexes is tightly regulated by light and oxygen signals. In a complex regulatory network several regulatory proteins and the small non‐coding RNA PcrZ contribute to the balanced expression of photosynthesis genes. With PcrX this study identifies a second sRNA that is part of this network. The puf operon encodes pigment binding proteins of the light‐harvesting I complex (PufBA) and of the reaction center (PufLM), a protein regulating porphyrin flux (PufQ), and a scaffolding protein (PufX). The PcrX sRNA is derived from the 3′ UTR of the puf operon mRNA by RNase E‐mediated cleavage. It targets the pufX mRNA segment, reduces the half‐life of the pufBALMX mRNA and as a consequence affects the level of photosynthetic complexes. By its action PcrX counteracts the increased expression of photosynthesis genes that is mediated by protein regulators and is thus involved in balancing the formation of photosynthetic complexes in response to external stimuli. The sRNA PcrX is involved in fine‐tuning the expression of puf genes for proteins of the photosynthetic apparatus of the facultative phototrophic bacterium Rhodobacter sphaeroides. It is derived from the 3´UTR of the puf operon by RNase E‐mediated processing, interacts with the pufX mRNA segment and affects the stability of the pufBALMX segment. Consequently, it influences the amount and the stoichiometry of light‐harvesting I and reaction center complexes (blue and green circles).
- Subjects
RHODOBACTER sphaeroides; GENE expression; NON-coding RNA; ADENOSINE triphosphate; PHOTOSYNTHESIS genetics
- Publication
Molecular Microbiology, 2018, Vol 110, Issue 3, p325
- ISSN
0950-382X
- Publication type
Article
- DOI
10.1111/mmi.14076