期刊
NATURE STRUCTURAL BIOLOGY
卷 9, 期 6, 页码 436-441出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/nsb795
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HtrA2/Omi, a mitchondrial serine protease in mammals, is important in programmed cell death. However, the underlining mechanism of HtrA2/Omi-mediated apoptosis remains unclear. Analogous to the bacterial homolog HtrA ( DegP) the mature HtrA2 protein contains a central serine protease domain and a C-terminal PDZ domain. The 2.0 Angstrom crystal structure of HtrA2/Omi reveals the formation of a pyramid-shaped homotrimer mediated exclusively by the serine protease domains. The peptide-binding pocket of the PDZ domain is buried in the intimate interface between the PDZ and the protease domains. Mutational analysis reveals that the monomeric HtrA2/Omi mutants are unable to induce cell death and are deficient in protease activity. The PDZ domain modulates HtrA2/Omi-mediated cell death activity by regulating its serine protease activity. These structural and biochemical observations provide an important framework for deciphering the mechanisms of HtrA2/Omi-mediated apoptosis.
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