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Review
, 69, 147-172

Protein Quality Control in the Endoplasmic Reticulum of Plants

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Review

Protein Quality Control in the Endoplasmic Reticulum of Plants

Richard Strasser. Annu Rev Plant Biol.

Abstract

The endoplasmic reticulum (ER) is the site of maturation for roughly one-third of all cellular proteins. ER-resident molecular chaperones and folding catalysts promote folding and assembly in a diverse set of newly synthesized proteins. Because these processes are error-prone, all eukaryotic cells have a quality-control system in place that constantly monitors the proteins and decides their fate. Proteins with potentially harmful nonnative conformations are subjected to assisted folding or degraded. Persistent folding-defective proteins are distinguished from folding intermediates and targeted for degradation by a specific process involving clearance from the ER. Although the basic principles of these processes appear conserved from yeast to animals and plants, there are distinct differences in the ER-associated degradation of misfolded glycoproteins. The general importance of ER quality-control events is underscored by their involvement in the biogenesis of diverse cell surface receptors and their crucial maintenance of protein homeostasis under diverse stress conditions.

Keywords: ERAD; ERQC; endoplasmic reticulum–associated degradation; glycoprotein; glycosylation; protein folding.

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