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Separating Golgi proteins from cis to trans reveals underlying properties of cisternal localization

Accepted version
Peer-reviewed

Type

Article

Change log

Authors

Parsons, Harriet 

Abstract

The order of enzymatic activity across Golgi cisternae is essential for complex molecule biosynthesis. However, an inability to separate Golgi cisternae has meant the cisternal distribution of most resident proteins, and their underlying localization mechanisms, are unknown. Here, we exploit differences in surface charge of intact cisternae to perform the first separation of early to late Golgi sub-compartments. We determine protein and glycan abundance profiles across the Golgi; over 390 resident proteins are identified, including 136 new additions, with over 180 cisternal assignments. These assignments provide a means to better understand the functional roles of Golgi proteins and how they operate sequentially. Protein and glycan distributions are validated in-vivo, using high resolution microscopy. Results reveal distinct functional compartmentalization among resident Golgi proteins. Analysis of transmembrane proteins shows several sequence-based characteristics relating to pI, hydrophobicity, Ser abundance and Phe bilayer asymmetry that change across the Golgi. Overall this suggests a continuum of TM features, rather than discrete rules, which guide proteins to earlier or later locations within the Golgi stack.

Description

Keywords

Golgi Apparatus, Hydrophobic and Hydrophilic Interactions, Intracellular Membranes, Membrane Proteins, Plant Proteins, Polysaccharides, Proteome

Journal Title

The Plant Cell

Conference Name

Journal ISSN

1040-4651
1532-298X

Volume Title

31

Publisher

American Society of Plant Biologists

Rights

All rights reserved
Sponsorship
Wellcome Trust (108467/Z/15/Z)
Marie Curie fellowship PIEF-GA-2011-301401 1058 (FP7-PEOPLE-2011) MRC