Conserved ABC Transport System Regulated by the General Stress Response Pathways of Alpha- and Gammaproteobacteria

Herrou, Julien; Willett, Jonathan W.; Czyż, Daniel M.; Babnigg, Gyorgy; Kim, Youngchang; Crosson, Sean

doi:10.1128/JB.00746-16

Conserved ABC Transport System Regulated by the General Stress Response Pathways of Alpha- and Gammaproteobacteria

Journal Article · Mon Dec 19 00:00:00 EST 2016 · Journal of Bacteriology

DOI:https://doi.org/10.1128/JB.00746-16· OSTI ID:1356416

Herrou, Julien ^[1]; Willett, Jonathan W. ^[1]; Czyż, Daniel M. ^[1]; Babnigg, Gyorgy ^[2]; Kim, Youngchang ^[2]; Crosson, Sean ^[1]

Univ. of Chicago, IL (United States)
Argonne National Lab. (ANL), Argonne, IL (United States)

Brucella abortus σ^E1 is an EcfG family sigma factor that regulates the transcription of dozens of genes in response to diverse stress conditions and is required for maintenance of chronic infection in a mouse model. A putative ATP-binding cassette transporter operon, bab1_0223-bab1_0226, is among the most highly activated gene sets in the σ^E1 regulon. The proteins encoded by the operon resemble quaternary ammonium-compatible solute importers but are most similar in sequence to the broadly conserved YehZYXW system, which remains largely uncharacterized. Transcription of yehZYXW is activated by the general stress sigma factor σ^S in Enterobacteriaceae, which suggests a functional role for this transport system in bacterial stress response across the classes Alphaproteobacteria and Gammaproteobacteria. Here, we present evidence that B. abortus YehZYXW does not function as an importer of known compatible solutes under physiological conditions and does not contribute to the virulence defect of a σ^E1-null strain. The sole in vitro phenotype associated with genetic disruption of this putative transport system is reduced growth in the presence of high Li⁺ ion concentrations. A crystal structure of B. abortus YehZ revealed a class II periplasmic binding protein fold with significant structural homology to Archaeoglobus fulgidus ProX, which binds glycine betaine. However, the structure of the YehZ ligand-binding pocket is incompatible with high-affinity binding to glycine betaine. This is consistent with weak measured binding of YehZ to glycine betaine and related compatible solutes. We conclude that YehZYXW is a conserved, stress-regulated transport system that is phylogenetically and functionally distinct from quaternary ammonium-compatible solute importers.

View Accepted Manuscript (DOE)

Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)

Sponsoring Organization:: National Institute of Allergy and Infectious Diseases (NIAID); National Institutes of Health (NIH); Ruth Kirschstein Postdoctoral Fellowship

OSTI ID:: 1356416

Alternate ID(s):: OSTI ID: 1390263

Journal Information:: Journal of Bacteriology, Journal Name: Journal of Bacteriology Journal Issue: 5 Vol. 199; ISSN 0021-9193

Publisher:: American Society for MicrobiologyCopyright Statement

Country of Publication:: United States

Language:: ENGLISH

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59 BASIC BIOLOGICAL SCIENCES
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lithium
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