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Detection, biosynthesis and some functions of glycans N-linked to plant secreted proteins

Published online by Cambridge University Press:  06 July 2010

N. H. Battey
Affiliation:
University of Reading
H. G. Dickinson
Affiliation:
University of Oxford
A. M. Hetherington
Affiliation:
Lancaster University
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Summary

Introduction

When considering the first steps in plant glycobiology, summarised in this review, it may be wise not to forget the suggestion of a French philosopher about the period that precedes attempts at addressing a new issue:

L'important est plus de poser les vraies questions que d'apporter les vraies réponses.

Levi-Strauss

Laboratories interested in plant glycobiology are currently asking some very basic questions such as:

What is a plant glycoprotein glycan made of?

How is a peptide glycosylated?

How is an N-linked glycan processed in a plant cell?

Why are some plant proteins N-glycosylated?

The present review is an attempt to summarise the way these questions are being addressed and the preliminary answers that have already been obtained.

Structures of N-linked glycans

Plant glycoproteins have oligosaccharide sidechains attached to their protein backbone via an N-linkage (amide nitrogen of asparagine) or O-linkage (hydroxyl group of serine, threonine or hydroxyproline). The N-linked oligosaccharides, or glycans, found on plant glycoproteins fall into two general categories already described for other eukaryotes: highmannose and complex glycans. The high-mannose type oligosaccharides have the general structure Man5–9(GlcNAC)2. High-mannose type oligosaccharides are found associated with immature and mature glycoproteins of higher plants (Faye et al., 1986). High-mannose glycans, first described for soybean lectin (Lis & Sharon, 1978), were observed in many other mature, vacuolar or extracellular plant lectins and enzymes (Paul & Stigbrand, 1970; Ericson & Chrispeels, 1973; Basha & Beevers, 1976; Sturm et al., 1987a).

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Publisher: Cambridge University Press
Print publication year: 1993

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