CtsR, the Gram-positive master regulator of protein quality control, feels the heat.
Protein quality networks are required for the maintenance of proper protein homeostasis and essential for viability and growth of all living organisms. Hence, regulation and coordination of these networks are critical for survival during stress as well as for virulence of pathogenic species. In low GC, Gram-positive bacteria central protein quality networks are under the control of the global repressor CtsR. Here, we provide evidence that CtsR activity during heat stress is mediated by intrinsic heat sensing through a glycine-rich loop, probably in all Gram-positive species. Moreover, a function for the recently identified arginine kinase McsB is confirmed, however, not for initial inactivation and dissociation of CtsR from the DNA, but for heat-dependent auto-activation of McsB as an adaptor for ClpCP-mediated degradation of CtsR.
Elsholz
Alexander K W
AK
Institute of Microbiology, Ernst-Moritz-Arndt-University Greifswald, Greifswald, Germany.
Michalik
Stephan
S
Zühlke
Daniela
D
Hecker
Michael
M
Gerth
Ulf
U
D001412:Bacillus subtilis / Q000235:genetics / Q000254:growth & development / Q000378:metabolism*; D001426:Bacterial Proteins / Q000235:genetics / Q000378:metabolism*; D015152:Blotting, Northern; D015180:Electrophoresis, Gel, Two-Dimensional; D024202:Electrophoretic Mobility Shift Assay; D015964:Gene Expression Regulation, Bacterial; D006094:Gram-Positive Bacteria / Q000235:genetics / Q000378:metabolism*; D006360:Heat-Shock Proteins / Q000235:genetics / Q000378:metabolism; D018869:Heat-Shock Response / Q000502:physiology*; D006358:Hot Temperature; D015151:Immunoblotting; D017354:Point Mutation / Q000235:genetics; D011494:Protein Kinases / Q000235:genetics / Q000378:metabolism; D012333:RNA, Messenger / Q000235:genetics; D012097:Repressor Proteins / Q000235:genetics / Q000378:metabolism*; D020133:Reverse Transcriptase Polymerase Chain Reaction
D001426:Bacterial Proteins; C087481:ClpC protein, Bacteria; C118338:CtsR protein, bacteria; D006360:Heat-Shock Proteins; D012333:RNA, Messenger; D012097:Repressor Proteins; D011494:Protein Kinases; C423322:McsB protein, Bacillus subtilis