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A regulatory cascade in the induction of rhaBAD.

Abstract：

:The RhaS and RhaR regulatory proteins are encoded in the Escherichia coli L-rhamnose gene cluster. We used complementation analysis and DNA mobility shift assays to show that RhaR is not the direct activator of the L-rhamnose catabolic operon, rhaBAD. An in-frame deletion of rhaS (rhaS-rhaR+) eliminated expression from the rhaBAD promoter, pBAD, while overexpression of rhaS greatly speeded the normally slow induction of transcription from pBAD. Expression from pBAD in a coupled transcription-translation assay was only detected when rhaS+ DNA was added to allow synthesis of RhaS protein. RhaS thus appears to be the direct L-rhamnose-specific activator of rhaBAD expression. Deletion mapping located the binding site for the L-rhamnose-specific regulator to a region overlapping position -70 relative to the rhaBAD transcription start site. Deletion mapping and DNA mobility shift assays located a CRP binding site just upstream from the binding site for the L-rhamnose-specific regulator. Quantitative primer extension analysis showed that induction of both the rhaBAD and rhaSR messages was unusually slow, requiring 40 to 50 minutes to reach a steady-state level. Induction of rhaBAD apparently involves a regulatory cascade in which RhaR first induces rhaSR expression, then RhaS accumulates and induces rhaBAD expression.

journal_name

J Mol Biol

journal_title

Journal of molecular biology

authors

Egan SM,Schleif RF

doi

10.1006/jmbi.1993.1565

subject

Has Abstract

pub_date

1993-11-05 00:00:00

pages

87-98

issue

1

eissn

0022-2836

issn

1089-8638

pii

S0022-2836(83)71565-2

journal_volume

234

pub_type

杂志文章

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