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Articles

Immunological Comparisons of Chymotrypsin Inhibitor I among Several Genera of the Solanaceae ¹

^a Department of Agricultural Chemistry, Washington State University, Pullman, Washington 99163

Microcomplement fixation was employed to compare the immunological differences that occur between purified inhibitor I from potato tubers, the four purified protomers that comprise it, and inhibitor I from tuber and leaf extracts. Total inhibitors of chymotrypsin and trypsin in leaves of seven genera of the Solanaceae were identified by enzymatic assay. In leaves of three genera, Solanum, Lycopersicum, and Datura, chymotrypsin inhibitor I was identified immunologically. In petals of all seven genera inhibitor I was also identified immunologically. With the microcomplement fixation technique inhibitor I from leaf or petal extracts of eight Solanaceae genera were compared. An immunological relationship of inhibitor I among seven of these genera was established.

³ Career Development Awardee of the United States Public Health Service. To whom reprint requests should be made.

¹ This research was supported in part by United States Public Health Grants G.M. 12505 and 2-K3-GM 17059, and by United States Department of Agriculture, Cooperative State Research Service Grant 915-15-29. College of Agriculture Research Center Scientific Paper No. 3823, Project 1791.