BrlR from Pseudomonas aeruginosa is a receptor for both cyclic di-GMP and pyocyanin.

Abstract:

:The virulence factor pyocyanin and the intracellular second messenger cyclic diguanylate monophosphate (c-di-GMP) play key roles in regulating biofilm formation and multi-drug efflux pump expression in Pseudomonas aeruginosa. However, the crosstalk between these two signaling pathways remains unclear. Here we show that BrlR (PA4878), previously identified as a c-di-GMP responsive transcriptional regulator, acts also as a receptor for pyocyanin. Crystal structures of free BrlR and c-di-GMP-bound BrlR reveal that the DNA-binding domain of BrlR contains two separate c-di-GMP binding sites, both of which are involved in promoting brlR expression. In addition, we identify a pyocyanin-binding site on the C-terminal multidrug-binding domain based on the structure of the BrlR-C domain in complex with a pyocyanin analog. Biochemical analysis indicates that pyocyanin enhances BrlR-DNA binding and brlR expression in a concentration-dependent manner.

journal_name

Nat Commun

journal_title

Nature communications

authors

Wang F,He Q,Yin J,Xu S,Hu W,Gu L

doi

10.1038/s41467-018-05004-y

subject

Has Abstract

pub_date

2018-07-02 00:00:00

pages

2563

issue

1

issn

2041-1723

pii

10.1038/s41467-018-05004-y

journal_volume

9

pub_type

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