The Gsp-1 genes encode the wheat arabinogalactan peptide

A - Papers appearing in refereed journals

Wilkinson, M. D., Tosi, P., Lovegrove, A., Corol, D. I., Ward, J. L., Palmer, R., Powers, S. J., Passmore, D., Webster, G., Marcus, S. E., Knox, J. P. and Shewry, P. R. 2017. The Gsp-1 genes encode the wheat arabinogalactan peptide. Journal of Cereal Science. 74, pp. 155-164.

AuthorsWilkinson, M. D., Tosi, P., Lovegrove, A., Corol, D. I., Ward, J. L., Palmer, R., Powers, S. J., Passmore, D., Webster, G., Marcus, S. E., Knox, J. P. and Shewry, P. R.
Abstract

Western blotting, ELISA and 1H-NMR spectroscopy showed that RNAi down-regulation of the wheat Gsp-1 gene resulted in reduced contents of both arabinogalactan peptide (AGP) and grain softness protein (GSP-1) in mature wheat grains confirming that these components are encoded by the same gene. A small increase in grain hardness and decrease in the viscosity of aqueous extracts of the transgenic lines also indicated small effects on functional properties. Immunolocalisation using a novel wheat AGP monoclonal antibody in conjunction with confocal microscopy showed that the major form of AGP which was eliminated in knockout lines is located within the cell, probably in the vacuole, and not in the plasma membrane or cell wall. However, clear localisation of the AGP epitope to the plasma membrane was observed in both control and transgenic lines and probably resulted from the presence of one or more separate forms of arabinogalactan protein. The existence of such additional form(s) was also indicated by 1H-NMR spectroscopy which showed that the ratio of arabinose to galactose differed between the control and transgenic lines.

Year of Publication2017
JournalJournal of Cereal Science
Journal citation74, pp. 155-164
Digital Object Identifier (DOI)doi:10.1016/j.jcs.2017.02.006
Open accessPublished as ‘gold’ (paid) open access
Funder project or codeDesigning Seeds for Nutrition and Health (DS)
FunderBiotechnology and Biological Sciences Research Council
Publisher's version
Output statusPublished
Publication dates
Online16 Feb 2017
Publication process dates
Accepted14 Feb 2017
PublisherElsevier
Academic Press Ltd- Elsevier Science Ltd
Copyright licenseCC BY
ISSN0733-5210

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