Ubiquitylation of an ERAD Substrate Occurs on Multiple Types of Amino Acids

Overview

Journal Mol Cell

Publisher Cell Press

Specialty Cell Biology

Date 2010 Dec 22

PMID 21172657

Citations 78

Authors

Yuichiro Shimizu

Yuki Okuda-Shimizu

Linda M Hendershot

Affiliations

Soon will be listed here.

Abstract

Any protein synthesized in the secretory pathway has the potential to misfold and would need to be recognized and ubiquitylated for degradation. This is astounding, since only a few ERAD-specific E3 ligases have been identified. To begin to understand substrate recognition, we wished to map the ubiquitylation sites on the NS-1 nonsecreted immunoglobulin light chain, which is an ERAD substrate. Ubiquitin is usually attached to lysine residues and less frequently to the N terminus of proteins. In addition, several viral E3s have been identified that attach ubiquitin to cysteine or serine/threonine residues. Mutation of lysines, serines, and threonines in the NS-1 variable region was necessary to significantly reduce ubiquitylation and stabilize the protein. The Hrd1 E3 ligase was required to modify all three amino acids. Our studies argue that ubiquitylation of ER proteins relies on very different mechanisms of recognition and modification than those used to regulate biological processes.

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