Analysis of the Heterogeneity of the 40,000 Molecular Weight Tuber Glycoprotein of Potatoes by Immunological Methods and by NH(2)-Terminal Sequence Analysis.
Among the major soluble tuber proteins of potato (Solanum tuberosum L.) is a group of glycoproteins having apparent molecular weights of approximately 40,000. This group of proteins as purified by ion-exchange and affinity chromatography has been given the trivial name ;patatin.' Patatin exists in a number of charge forms which differ between potato cultivars and in some cases can also be resolved into a number of bands by sodium dodecyl sulfate-polyacrylamide gel electrophoresis. However, by immunodiffusion and immunoelectrophoresis, it was found that the isoforms of patatin are immunologically identical both within a cultivar as well as between cultivars. A high degree of homology between the isoforms of patatin is also indicated by NH(2)-terminal amino acid sequence analysis.
Park
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Department of Horticulture, Purdue University, West Lafayette, Indiana 47907.
Blackwood
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Mignery
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Hermodson
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Lister
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