Abstract

Endomembrane trafficking is an evolutionarily conserved process for all eukaryotic organisms. It is a fundamental and essential process for the transportation of proteins, lipids, or cellular metabolites. The aforementioned cellular components are sorted across multiple membrane-bounded organelles. In plant cells, the endomembrane mainly consists of the nuclear envelope, endoplasmic reticulum (ER), Golgi apparatus, trans-Golgi network or early endosome (TGN/EE), prevacuolar compartments or multivesicular bodies (PVCs/MVBs), and vacuole. Among them, Golgi apparatus and TGN represent two central sorting intermediates for cargo secretion and recycling from other compartments by anterograde or retrograde trafficking. Several protein sorting machineries have been identified to function in these pathways for cargo recognition and vesicle assembly. Exciting progress has been made in recent years to provide novel insights into the sorting complexes and also the underlying sorting mechanisms in plants. Here, we will highlight the recent findings for the adaptor protein (AP) complexes, retromer, and retriever complexes, and also their functions in the related coated vesicle formation in post-Golgi trafficking.

Highlights

  • Protein trafficking is a complex of tightly regulated physiological processes in plant

  • From the trans face of the Golgi apparatus, various types of budding vesicles are formed and transported via the trans-Golgi network or early endosome (TGN/EE) to the plasma membrane (PM), apoplast, vacuole, or for cell plate formation (Figure 1), which requires a set of adaptor protein (AP) complexes localized on different subdomains

  • It has been shown that TPLATE complex (TPC) is necessary for PM association of clathrin independent of AP2 (Wang et al, 2016). These results indicate that plant cells may initiate corresponding AP complexes for clathrin-mediated endocytosis (CME) in response to different developmental signals

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Summary

Introduction

Protein trafficking is a complex of tightly regulated physiological processes in plant. An Update on Coat Protein Complexes for Vesicle Formation in Plant Post-Golgi Trafficking We will highlight the recent findings for the adaptor protein (AP) complexes, retromer, and retriever complexes, and their functions in the related coated vesicle formation in post-Golgi trafficking.

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