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Analysis of reading frame and expressional regulation of randomly selected promoter-proximal genes in Escherichia coli.

Authors
  • Talukder, Ali Azam1
  • Yanai, Satoshi
  • Yamada, Mamoru
  • 1 Department of Biological Chemistry, Faculty of Agriculture, Yamaguchi University, Yamaguchi, Japan. [email protected] , (Japan)
Type
Published Article
Journal
The Journal of general and applied microbiology
Publication Date
Apr 01, 2005
Volume
51
Issue
2
Pages
93–103
Identifiers
PMID: 15942870
Source
Medline
License
Unknown

Abstract

The expression of seventy-seven randomly cloned genes of Escherichia coli was examined following a variety of treatments including heat shock, glucose starvation, phosphate starvation, ammonium starvation or osmotic shock, with the aid of lacZ reporter gene protein fusions on multicopy plasmids. Two of 77 genes (amr and yigL) had not previously been identified as protein encoding open-reading frames (ORFs) in annotations of the E. coli genome database. Thirteen genes exhibited significant changes in expression in response to at least one of the treatments, and six of them appeared to be controlled by more than one sigma (sigma) factor of RNA polymerase. This study thus allows us not only to identify the reading frame of the genomic genes but also to support the hypothesis earlier proposed that a significant proportion of genes in E. coli are involved in adaptations to various stresses to which the organism is likely to be exposed in the environment.

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