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The C ampylobacter jejuni CprRS two‐component regulatory system regulates aspects of the cell envelope
Author(s) -
Svensson Sarah L.,
Hyunh Steven,
Parker Craig T.,
Gaynor Erin C.
Publication year - 2015
Publication title -
molecular microbiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.857
H-Index - 247
eISSN - 1365-2958
pISSN - 0950-382X
DOI - 10.1111/mmi.12927
Subject(s) - biology , two component regulatory system , response regulator , campylobacter jejuni , biofilm , phosphorylation , microbiology and biotechnology , gene , mutant , genetics , bacteria
Summary C ampylobacter jejuni is a leading cause of food‐borne gastroenteritis in humans. It lives commensally in the gastrointestinal tract of animals, and tolerates variable conditions during transit/colonization of susceptible hosts. The C . jejuni CprRS two‐component system contains an essential response regulator ( CprR ), and deletion of the cprS sensor kinase enhances biofilms. We sought to identify CprRS ‐regulated genes and better understand how the system affects survival. Expression from the cprR promoter was highest during logarithmic growth and dependent on CprS . CprR D 52 A did not support viability, indicating that CprR phosphorylation is essential despite the dispensability of CprS . We identified a GTAAAC consensus bound by the CprR C ‐terminus; the Asp52 residue of full‐length CprR was required for binding, suggesting phosphorylation is required. Transcripts differing in expression in Δ cprS compared with wildtype ( WT ) contained a putative CprR binding site upstream of their promoter region and encoded htrA (periplasmic protease upstream of cprRS ) and peb4 ( SurA ‐like chaperone). Consistent with direct regulation, the CprR consensus in the htrA promoter was bound by CprR CTD . Finally, Δ htrA formed enhanced biofilms, and Δ cprS biofilms were suppressed by Mg 2+ . CprRS is the first C . jejuni regulatory system shown to control genes related to the cell envelope, the first line of interaction between pathogen and changing environments.