Isolation and sequence of cDNA encoding the soybean protease inhibitors PI IV and C-II.

Two full-length (or nearly so) cDNA clones containing information for the protease inhibitors PI IV and C-II from soybean seeds were identified by means of a synthetic probe. DNA sequencing revealed that the two protease inhibitors are synthesized as precursors with a short peptide leader. The coding regions of the two clones show 80% homology, wheraes the 5' non-coding regions are 90% homologous. Homology of 75% is found in the region extending beyond the stop codons.