J Integr Plant Biol. ›› 2013, Vol. 55 ›› Issue (1): 54-63.DOI: 10.1111/jipb.12007

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Non-26S Proteasome Proteolytic Role of Ubiquitin in Plant Endocytosis and Endosomal Trafficking

Miaomiao Tian and Qi Xie*   

  1. State Key Laboratory of Plant Genomics, National Center for Plant Gene Research, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100101, China
  • Received:2012-09-29 Accepted:2012-11-01 Published:2013-01-01
  • About author:*Corresponding author Tel/Fax: +86 10 6480 6619; E-mail: qxie@genetics.ac.cn


The 76 amino acid protein ubiquitin (Ub) is highly conserved in all eukaryotic species. It plays important roles in many cellular processes by covalently attaching to the target proteins. The best known function of Ub is marking substrate proteins for degradation by the 26S proteasome. In fact, other consequences of ubiquitination have been discovered in yeast and mammals, such as membrane trafficking, DNA repair, chromatin modification, and protein kinase activation. The common mechanism underlying these processes is that Ub serves as a signal to sort proteins to the vacuoles or lysosomes for degradation as opposed to 26S proteasome-dependent degradation. To date, several reports have indicated that a similar function of Ub also exists in plants. This review focuses on a summary and analysis of the recent research progress on Ub acting as a signal to mediate endocytosis and endosomal trafficking in plants.

Key words: Endocytosis, endosomal trafficking, ubiquitin

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