Promoter and regulon analysis of nitrogen assimilation factor, sigma54, reveal alternative strategy for E. coli MG1655 flagellar biosynthesis.

Abstract:

:Bacteria core RNA polymerase (RNAP) must associate with a sigma factor to recognize promoter sequences. Promoters recognized by the sigma(54) (or sigma(N)) associated RNA polymerase are unique in having conserved positions around -24 and -12 nucleotides upstream from the transcriptional start site. Using DNA microarrays representing the entire Escherichia coli genome and promoter validation approaches, we identify 40 in vivo targets of sigma(54), the nitrogen assimilation sigma factor, and estimate that there are 70 sigma(54) promoters in total. Immunoprecipitation assays have been performed to further evaluate the efficiency of our approaches. In addition, promoter consensus binding search and primer extension assay helped us to identify a new sigma(54) promoter carried by insB-5 in the upstream of flhDC operon. The involvement of sigma(54) in flagellar biosynthesis in sequenced E. coli strain MG1655 indicates a fluid gene regulation phenomenon carried by some mobile elements in bacteria genome.

journal_name

Nucleic Acids Res

journal_title

Nucleic acids research

authors

Zhao K,Liu M,Burgess RR

doi

10.1093/nar/gkp1123

subject

Has Abstract

pub_date

2010-03-01 00:00:00

pages

1273-83

issue

4

eissn

0305-1048

issn

1362-4962

pii

gkp1123

journal_volume

38

pub_type

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