Dissection of σE‐dependent cell lysis in Escherichia coli: roles of RpoE regulators RseA, RseB and periplasmic folding catalyst PpiD

Rashed Noor; Masayuki Murata; Hiroshi Nagamitsu; Gracjana Klein-Raina; Satish Raina; Mamoru Yamada

doi:10.1111/j.1365-2443.2009.01318.x

Dissection of σE‐dependent cell lysis in Escherichia coli: roles of RpoE regulators RseA, RseB and periplasmic folding catalyst PpiD

Abstract

To understand the mechanism of sigma(E)-dependent cell lysis, we examined the consequences of deletion derivatives of rpoE regulators rseA, rseB and rseC on sigma(E) transcription, on levels of free versus membrane-bound sigma(E) and on OMP-biogenesis limiting factor(s) that could impact cell lysis. RT-PCR showed that individual nonpolar DeltarseA and DeltarseB increased the rpoE expression to varying extents, with pronounced induction in DeltarseA. Significantly the ratio of soluble (free) versus membrane-bound form of RpoE increased in DeltarseA, however without increase of its total amount, unraveling furthermore complexity in RpoE regulation. Significant characteristics of cell lysis, accompanied by a severe reduction in the levels of periplasmic OMP-folding factor (PpiD), were observed in DeltarseA. The cell-lysis phenotype of DeltarseA was suppressed by either rseA or ppiD plasmids, but neither by rseB nor by rseC clones. However, the cell lysis of the wild-type strain was almost completely repressed not only by the rseA clone but also by the rseB clone, suggesting RseB might be limiting in vivo. Thus, increase in the ratio of free sigma(E) in rseA mutants with a concomitant reduction in PpiD levels can account for sigma(E)-dependent lysis in concert with a potential role of small RNAs on the lysis process.

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Authors (6)

Rashed Noor dr
Masayuki Murata
Hiroshi Nagamitsu
Gracjana Klein-Raina dr hab.
Satish Raina prof. dr
Mamoru Yamada

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DOI:: Digital Object Identifier (open in new tab) 10.1111/j.1365-2443.2009.01318.x
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Category:: Articles
Type:: artykuły w czasopismach
Published in:: GENES TO CELLS no. 14, pages 885 - 899,
ISSN: 1356-9597
Language:: English
Publication year:: 2009
Bibliographic description:: Noor R., Murata M., Nagamitsu H., Klein-Raina G., Raina S., Yamada M.: Dissection of σE‐dependent cell lysis in Escherichia coli: roles of RpoE regulators RseA, RseB and periplasmic folding catalyst PpiD// GENES TO CELLS -Vol. 14,iss. 7 (2009), s.885-899
DOI:: Digital Object Identifier (open in new tab) 10.1111/j.1365-2443.2009.01318.x
Verified by:: Gdańsk University of Technology