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Lys11- and Lys48-linked ubiquitin chains interact with p97 during endoplasmic-reticulum-associated degradation.

Biochem J.. 2014-04;  459(1):205-16
L Matthew, IT Julia, DP Matthew. Sanford-Burnham Medical Research Institute, 10901 North Torrey Pines Road, La Jolla, CA 92037, U.S.A.
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摘要

The ATPase associated with various cellular activities p97 has a critical function in the cytoplasmic degradation of proteins misfolded in the ER (endoplasmic reticulum) through a mechanism known as ERAD (ER-associated degradation). During this process, p97 binds polyubiquitinated ERAD substrates and couples ATP hydrolysis to their dislocation from the ER as a prerequisite to destruction by the proteasome. The ubiquitin signals important for this process are not fully understood. In the present paper we report that p97 interacts with Lys11- and Lys48-linked ubiquitin polymers, but not those containing Lys63 linkages. Disruption of p97 through siRNA-mediated depletion, dominant-negative overexpression or chemica... More

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