Ubiquitin-dependent Regulation of COPII Coat Size and Function

Overview

Journal Nature

Specialty Science

Date 2012 Feb 24

PMID 22358839

Citations 180

Authors

Lingyan Jin

Kanika Bajaj Pahuja

Katherine E Wickliffe

Amita Gorur

Christine Baumgartel

Randy Schekman

Michael Rape

Affiliations

Soon will be listed here.

Abstract

Packaging of proteins from the endoplasmic reticulum into COPII vesicles is essential for secretion. In cells, most COPII vesicles are approximately 60-80 nm in diameter, yet some must increase their size to accommodate 300-400 nm procollagen fibres or chylomicrons. Impaired COPII function results in collagen deposition defects, cranio-lenticulo-sutural dysplasia, or chylomicron retention disease, but mechanisms to enlarge COPII coats have remained elusive. Here, we identified the ubiquitin ligase CUL3-KLHL12 as a regulator of COPII coat formation. CUL3-KLHL12 catalyses the monoubiquitylation of the COPII-component SEC31 and drives the assembly of large COPII coats. As a result, ubiquitylation by CUL3-KLHL12 is essential for collagen export, yet less important for the transport of small cargo. We conclude that monoubiquitylation controls the size and function of a vesicle coat.

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