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Functional Plant Biology Functional Plant Biology Society
Plant function and evolutionary biology
REVIEW

Trafficking to the seed protein storage vacuole

Joanne R. Ashnest A B and Anthony R. Gendall A C
+ Author Affiliations
- Author Affiliations

A Department of Animal, Plant and Soil Sciences, AgriBio, Centre for AgriBiosciences, 5 Ring Road, La Trobe University, Bundoora, Vic. 3086, Australia.

B Global Institute for Food Security, 110 Gymnasium Place, University of Saskatchewan, Saskatoon, SK, Canada.

C Corresponding author. Email: t.gendall@latrobe.edu.au

Functional Plant Biology 45(9) 895-910 https://doi.org/10.1071/FP17318
Submitted: 14 November 2017  Accepted: 17 February 2018   Published: 22 March 2018

Abstract

The processing and subcellular trafficking of seed storage proteins is a critical area of physiological, agricultural and biotechnological research. Trafficking to the lytic vacuole has been extensively discussed in recent years, without substantial distinction from trafficking to the protein storage vacuole (PSV). However, despite some overlap between these pathways, there are several examples of unique processing and machinery in the PSV pathway. Moreover, substantial new data has recently come to light regarding the important players in this pathway, in particular, the intracellular NHX proteins and their role in regulating lumenal pH. In some cases, these new data are limited to genetic evidence, with little mechanistic understanding. As such, the implications of these data in the current paradigm of PSV trafficking is perhaps yet unclear. Although it has generally been assumed that the major classes of storage proteins are trafficked via the same pathway, there is mounting evidence that the 12S globulins and 2S albumins may be trafficked independently. Advances in identification of vacuolar targeting signals, as well as an improved mechanistic understanding of various vacuolar sorting receptors, may reveal the differences in these trafficking pathways.

Additional keywords: Arabidopsis spp., globulins, seed development, seed storage protein, vacuoles.


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