Protein and RNA Quality Control by Autophagy in Plant Cells
Seok Ho Yoon and Taijoon Chung*
Department of Biological Sciences, Pusan National University, Busan 46241, Korea
Taijoon Chung
Received January 22, 2019; Revised March 3, 2019; Accepted March 19, 2019.; Published online April 10, 2019.
© Korean Society for Molecular and Cellular Biology. All rights reserved.

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Eukaryotic cells use conserved quality control mechanisms to repair or degrade defective proteins, which are synthesized at a high rate during proteotoxic stress. Quality control mechanisms include molecular chaperones, the ubiquitin-proteasome system, and autophagic machinery. Recent research reveals that during autophagy, membrane-bound organelles are selectively sequestered and degraded. Selective autophagy is also critical for the clearance of excess or damaged protein complexes (e.g., proteasomes and ribosomes) and membrane-less compartments (e.g., protein aggregates and ribonucleoprotein granules). As sessile organisms, plants rely on quality control mechanisms for their adaptation to fluctuating environments. In this mini-review, we highlight recent work elucidating the roles of selective autophagy in the quality control of proteins and RNA in plant cells. Emphasis will be placed on selective degradation of membrane-less compartments and protein complexes in the cytoplasm. We also propose possible mechanisms by which defective proteins are selectively recognized by autophagic machinery.
Keywords: aggrephagy, autophagy receptor, granulophagy, NBR1, proteaphagy, ribophagy, ubiquitylatio

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31 March 2019 Volume 42,
Number 3, pp. 189~283

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