David J.Hannapel* Department of Horticulture, lowa State University, Ames, lowa 5001 1 Severa1 storage proteins of potato (Solanum tuberosum L.) tubers have been identified, including severa1 proteinase inhibitors such as proteinase inhibitor I and I1 and the 22-kD protein group (Melville and Ryan, 1972; Bryant et al., 1976; Suh et al., 1990). The 22-kD cathepsin D inhibitor protein of potatoes (PDI) has been purified and characterized (Mares et al., 1989). This glycosylated protein inhibits cathepsin D and trypsin activity and is homologous with the soybean trypsin inhibitor family (Mares et al., 1989). Recent studies showed that PDI transcripts accumulate in potato tubers, stems, roots, This work was supported by the Iowa State University Biotechnology Council. Journal Paper No. J-14950 of the Iowa Agriculture and Home Economics Experiment Station, Ames, IA. Project No. 3056. * Fax 1-515-294-0730. and leaves depending on genotype and stage of development (Hannapel, 1991). Accumulation of potato cathepsin D inhibitor mRNA is wound inducible in leaves and occurs both locally and systemically (Suh et al., 1991). The PDI cDNA clone p749 was isolated from a tuber cDNA library using differential screening (Table I). The DNA sequence data and the deduced amino acid sequence are shown
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