Jm. Baek et al., NUCLEOTIDE-SEQUENCE HOMOLOGY OF CDNAS ENCODING SOYBEAN BOWMAN-BIRK TYPE PROTEINASE-INHIBITOR AND ITS ISOINHIBITORS, Bioscience, biotechnology, and biochemistry, 58(5), 1994, pp. 843-846
The sequences of cDNA clones encoding the Bowman-Birk proteinase inhib
itor (BBPI) and its isoinhibitors (D-II and C-II) have been identified
. Nucleotide sequence homologies among these clones and between the tw
o reactive domains in each clone were very high. These homologies sugg
est that the BBPI and its isoinhibitor genes may have evolved from a c
ommon ancestral inhibitor. Also, clone pB2 (D-II) had two identical re
active sites that inhibit trypsin only, and three repetitive regions t
hat are about 81 bp and initiated with ATG. It was assumed from these
results that isoinhibitor D-II was the most primordial type of these i
nhibitors.