An ensemble-guided approach identifies ClpP as a major regulator of transcript levels in nitric oxide-stressed Escherichia coli.

TitleAn ensemble-guided approach identifies ClpP as a major regulator of transcript levels in nitric oxide-stressed Escherichia coli.
Publication TypeJournal Article
Year of Publication2015
AuthorsRobinson, JL, Brynildsen, MP
JournalMetab Eng
Volume31
Pagination22-34
Date Published2015 Sep
ISSN1096-7184
KeywordsBiocatalysis, Dihydropteridine Reductase, Endopeptidase Clp, Escherichia coli, Escherichia coli Proteins, Hemeproteins, NADH, NADPH Oxidoreductases, Nitric Oxide, Promoter Regions, Genetic, RNA, Messenger, Sequence Analysis, RNA, Stress, Physiological, Transcription, Genetic
Abstract

<p>The importance of NO(∙) to immunity is highlighted by the diversity of pathogens that require NO(∙)-defensive systems to establish infections. Proteases have been identified to aid pathogens in surviving macrophage attack, inspiring us to investigate their role during NO(∙) stress in Escherichia coli. We discovered that the elimination of ClpP largely impaired NO(∙) detoxification by E. coli. Using a quantitative model of NO(∙) stress, we employed an ensemble-guided approach to identify the underlying mechanism. Iterations of in silico analyses and corresponding experiments identified the defect to result from deficient transcript levels of hmp, which encodes NO(∙) dioxygenase. Interestingly, the defect was not confined to hmp, as ΔclpP imparted widespread perturbations to the expression of NO(∙)-responsive genes. This work identified a target for anti-infective therapies based on disabling NO(∙) defenses, and demonstrated the utility of model-based approaches for exploring the complex, systems-level stress exerted by NO(∙). </p>

DOI10.1016/j.ymben.2015.06.005
Alternate JournalMetab Eng
PubMed ID26112956