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JXB Advance Access published online on August 1, 2005
Journal of Experimental Botany, doi:10.1093/jxb/eri226
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© The Author [2005]. Published by Oxford University Press [on behalf of the Society for Experimental Biology]. All rights reserved. For Permissions, please e-mail: journals.permissions@oupjournals.org
Received October 5, 2004
Accepted May 13, 2005

RESEARCH PAPER

A soybean seed protein with carboxylate-binding activity

Sangeeta Dhaubhadel 1*, Kuflom Kuflu 1, Maria Carmen Romero 1, and Mark Gijzen 1

1 Southern Crop Protection and Food Research Center, Agriculture and Agri-Food Canada, 1391 Sandford Street, London, Ontario, Canada N5V 4T3

* To whom correspondence should be addressed.
Sangeeta Dhaubhadel, E-mail: dhaubhadels{at}agr.gc.ca


  Abstract

The seed coat serves as a multifunctional organ with a role in protection and for the supply of nutrients to the embryo sac during development. The composition of the legume seed coat differs from other seed tissues in many ways including its protein composition. An abundant 24 kDa protein (SC24) has been purified and identified from soybean (Glycine max [L.] Merr) seed hulls. The corresponding cDNA and genomic DNA clones for SC24 were isolated and characterized, and expression patterns were determined. The deduced protein sequence of 219 amino acids included an N-terminal signal peptide. Transcripts encoding SC24 were present in the seed coat from 30 days after pollination (DAP) until maturity, but the protein was not detected until the final stages of seed maturation. In mature seeds, most of the SC24 protein was localized to the parenchyma and aleurone layers of the seed coat. The expression of SC24 was also induced in vegetative tissues by pathogen infection and by wounding. The SC24 protein bound to an affinity column containing an isophthalic acid ligand, and was eluted with 7 mM citrate. Polyclonal antibodies raised against recombinant SC24 cross-reacted with the seed coat peroxidase enzyme, suggesting that these two proteins may share an antigenic determinant. Overall, the results indicate that SC24 belongs to a novel class of plant defence proteins with carboxylate-binding activity.

Keywords: Citrate binding protein; peroxidase; seed coat; soybean; wound stress.
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Identification and characterization of isoflavonoid specific glycosyltransferase and malonyltransferase from soybean seeds
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[Abstract] [Full Text] [PDF]


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