Tetrapyrrole biosynthesis in Rhodobacter capsulatus is transcriptionally regulated by the heme-binding regulatory protein, HbrL.

Abstract:

:We demonstrate that the expression of hem genes in Rhodobacter capsulatus is transcriptionally repressed in response to the exogenous addition of heme. A high-copy suppressor screen for regulators of hem gene expression resulted in the identification of an LysR-type transcriptional regulator, called HbrL, that regulates hem promoters in response to the availability of heme. HbrL is shown to activate the expression of hemA and hemZ in the absence of exogenous hemin and repress hemB expression in the presence of exogenous hemin. Heterologously expressed HbrL apoprotein binds heme b and is purified with bound heme b when expressed in the presence of 5-aminolevulinic acid. Electrophoretic gel shift analysis demonstrated that HbrL binds the promoter region of hemA, hemB, and hemZ as well as its own promoter and that the presence of heme increases the binding affinity of HbrL to hemB.

journal_name

J Bacteriol

journal_title

Journal of bacteriology

authors

Smart JL,Bauer CE

doi

10.1128/JB.188.4.1567-1576.2006

keywords:

subject

Has Abstract

pub_date

2006-02-01 00:00:00

pages

1567-76

issue

4

eissn

0021-9193

issn

1098-5530

pii

188/4/1567

journal_volume

188

pub_type

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