Ubiquitin recognition in endocytic trafficking – with or without ESCRT-0

Author:

Mosesso Niccolò1,Nagel Marie-Kristin1,Isono Erika1ORCID

Affiliation:

1. Department of Biology, University of Konstanz, D-78464 Konstanz, Germany

Abstract

ABSTRACT The ability to sense and adapt to the constantly changing environment is important for all organisms. Cell surface receptors and transporters are key for the fast response to extracellular stimuli and, thus, their abundance on the plasma membrane has to be strictly controlled. Heteromeric endosomal sorting complexes required for transport (ESCRTs) are responsible for mediating the post-translational degradation of endocytosed plasma membrane proteins in eukaryotes and are essential both in animals and plants. ESCRTs bind and sort ubiquitylated cargoes for vacuolar degradation. Although many components that comprise the multi-subunit ESCRT-0, ESCRT-I, ESCRT-II and ESCRT-III complexes are conserved in eukaryotes, plant and animal ESCRTs have diverged during the course of evolution. Homologues of ESCRT-0, which recognises ubiquitylated cargo, have emerged in metazoan and fungi but are not found in plants. Instead, the Arabidopsis genome encodes plant-specific ubiquitin adaptors and a greater number of target of Myb protein 1 (TOM1) homologues than in mammals. In this Review, we summarise and discuss recent findings on ubiquitin-binding proteins in Arabidopsis that could have equivalent functions to ESCRT-0. We further hypothesise that SH3 domain-containing proteins might serve as membrane curvature-sensing endophilin and amphiphysin homologues during plant endocytosis.

Funder

Deutsche Forschungsgemeinschaft

Publisher

The Company of Biologists

Subject

Cell Biology

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