Nucleic Acids Research, 1983, Vol. 11, No. 8 2367-2380
© 1983
MOLECULAR BIOLOGY |
The vicilin gene family of pea (Pisum sativum L.): a complete cDNA coding sequence for preprovicilin
University of Durham, Department of Botany South Road, Durham DH1 3LE, UK
*To whom correspondence should be addressed
Received February 3, 1983. Revised March 17, 1983. Accepted March 17, 1983.
A cDNA plasmid bank has been constructed using mRNA from developing pea seeds and three cDNAs coding for vicilin polypeptides have been selected. These cDNAs have been sequenced and between them cover the whole of the coding sequence plus part of the 5' and 3' untranslated regions. Comparison with amino acid sequence data from the protein indicates that vicilin is synthesised as preprovicilin with subsequent removal of a signal peptide and a C-terminal peptide as well as post translational endo-proteolytic cleavage. The cDNAs represent two different classes of vicilin genes whilst amino acid data show that there are at least three major classes of vicilin polypeptide. The vicilin sequences show extensive homology with conglycinin and phaseolin except in the regions of the internal proteolytic cleavages. The evolutionary significance of this relationship is discussed.
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