Expression of micF involved in porin synthesis in Escherichia coli: two distinct cis-acting elements respectively regulate micF expression positively and negatively.

Abstract:

:micF RNA, whose sequence is highly complementary to a 5'-portion of ompF mRNA, has been implicated in the osmoregulation and thermoregulation of the ompF porin gene in Escherichia coli. To define and characterize cis-acting regulatory regions upstream of the micF promoter, a series of deletions of the micF promoter fused to the lacZ gene were constructed. Two distinct regions, which function differently, were identified as cis-acting regulatory elements, namely, one responsible for OmpR-dependent activation and the other for OmpR-independent repression of micF expression. The former contains the OmpR-binding site, which simultaneously regulates both the genes, micF and ompC, in response to the medium osmolarity. The latter may be involved in an unknown regulatory process of micF expression.

journal_name

FEMS Microbiol Lett

authors

Takayanagi K,Maeda S,Mizuno T

doi

10.1016/0378-1097(91)90440-l

subject

Has Abstract

pub_date

1991-09-15 00:00:00

pages

39-44

issue

1

eissn

0378-1097

issn

1574-6968

journal_volume

67

pub_type

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