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HTRA proteases: regulated proteolysis in protein quality control
Tim Clausen1, Markus Kaiser, Robert Huber
1Research Institute of Molecular Pathology, Dr. Bohrgasse 7, A-1030 Vienna, Austria. tim.clausen@imp.ac.at
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Controlled proteolysis underlies a vast diversity of protective and regulatory processes that are of key importance to cell fate. The unique molecular architecture of the widely conserved high temperature requirement A (HTRA) proteases has evolved to mediate critical aspects of ATP-independent protein quality control. The simple combination of a classic Ser protease domain and a carboxy-terminal peptide-binding domain produces cellular factors of remarkable structural and functional plasticity that allow cells to rapidly respond to the presence of misfolded or mislocalized polypeptides.
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