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Plant Physiology 78:172-177 (1985)
© 1985 American Society of Plant Biologists

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Articles

Biochemical Characterization of Rice Glutelin 1

Tuan-Nan Wen and Dawn S. Luthe

Department of Biochemistry, Mississippi State University, Mississippi State, Mississippi 39762

The two major subunits of rice glutelin, the acidic ({alpha}) and basic (beta) polypeptides were purified by chromatofocusing and cation exchange chromatography, respectively. The molecular weight range of the {alpha} polypeptides was 28.5 to 30.8 kilodaltons and the molecular weight range of the beta polypeptides was 20.6 to 21.6 kilodaltons. Electrofocusing in polyacrylamide gels showed that the isoelectric points of the {alpha} and beta polypeptides were 6.5 to 7.5 and 9.4 to 10.3, respectively. At least 12 polypeptides of the {alpha}-group and nine polypeptides of the beta-group could be separated by electrofocusing. The amino acid compositions of whole glutelin, and the purified {alpha} and beta subunits were analyzed. The {alpha} subunit contained more glutamic acid/glutamine, serine, and glycine, and less alanine, lysine, aspartic acid/asparagine, and isoleucine than the beta subunit. A comparison of the amino acid composition of rice glutelin subunits with those of the 11S proteins from eight other plant species indicated that there is more similarity between the beta subunits than the {alpha} subunits of several diverse plant species.

1 Mississippi Agricultural and Forestry Experiment Station, publication no. 5938.




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Copyright © 1985 by the American Society of Plant Biologists