Download MendeleyStudies on peptide:N-glycanase-p97 interaction suggest that p97 phosphorylation modulates endoplasmic reticulum-associated degradation.
Zhao, G., Zhou, X., Wang, L., Li, G., Schindelin, H., Lennarz, W.J.(2007) Proc Natl Acad Sci U S A 104: 8785-8790
- PubMed: 17496150
- DOI: https://doi.org/10.1073/pnas.0702966104
- Primary Citation of Related Structures:
2HPJ, 2HPL - PubMed Abstract:
During endoplasmic reticulum-associated degradation, the multifunctional AAA ATPase p97 is part of a protein degradation complex. p97 associates via its N-terminal domain with various cofactors to recruit ubiquitinated substrates. It also interacts with alternative substrate-processing cofactors, such as Ufd2, Ufd3, and peptide:N-glycanase (PNGase) in higher eukaryotes. These cofactors determine different fates of the substrates and they all bind outside of the N-terminal domain of p97. Here, we describe a cofactor-binding motif of p97 contained within the last 10 amino acid residues of the C terminus, which is both necessary and sufficient to mediate interactions of p97 with PNGase and Ufd3. The crystal structure of the N-terminal domain of PNGase in complex with this motif provides detailed insight into the interaction between p97 and its substrate-processing cofactors. Phosphorylation of p97's highly conserved penultimate tyrosine residue, which is the main phosphorylation site during T cell receptor stimulation, completely blocks binding of either PNGase or Ufd3 to p97. This observation suggests that phosphorylation of this residue modulates endoplasmic reticulum-associated protein degradation activity by discharging substrate-processing cofactors.
Organizational Affiliation:
Center for Structural Biology, Deparatment of Biochemistry and Cell Biology, Stony Brook University, Stony Brook, NY 11794-5115, USA.
