Article
The ClpCP Complex Modulates Respiratory Metabolism in Staphylococcus aureus and Is Regulated in a SrrAB-Dependent Manner
Authors
Ameya A. Mashruwala, Brian J. Eilers, Amanda L. Fuchs, Javiera Norambuena, Carly A. Earle, Adriana van de Guchte, Brian P. Tripet, Valerie Copie, Jeffrey M. Boyd
Publication
Journal of Bacteriology
Abstract
The staphylococcal respiratory regulator (SrrAB) modulates energy metabolism in Staphylococcus aureus. Studies have suggested that regulated protein catabolism facilitates energy homeostasis. Regulated proteolysis in S. aureus is achieved through protein complexes composed of a peptidase (ClpQ or ClpP) in association with an AAA+ family ATPase (typically, ClpC or ClpX). In the present report, we tested the hypothesis that SrrAB regulates a Clp complex to facilitate energy homeostasis in S. aureus. Strains deficient in one or more Clp complexes were attenuated for growth in the presence of puromycin, which causes enrichment of misfolded proteins. A ?srrAB strain had increased sensitivity to puromycin. Epistasis experiments suggested that the puromycin sensitivity phenotype of the ?srrAB strain was a result of decreased ClpC activity. Consistent with this, transcriptional activity of clpC was decreased in the ?srrAB mutant, and overexpression of clpC suppressed the puromycin sensitivity of the ?srrAB strain. We also found that ClpC positively influenced respiration and that it did so upon association with ClpP. In contrast, ClpC limited fermentative growth, while ClpP was required for optimal fermentative growth. Metabolomics studies demonstrated that intracellular metabolic profiles of the ?clpC and ?srrAB mutants were distinct from those of the wild-type strain, supporting the notion that both ClpC and SrrAB affect central metabolism. We propose a model wherein SrrAB regulates energy homeostasis, in part, via modulation of regulated proteolysis.
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