Abstract
A monoclonal antibody was produced against Kunitz soybean inhibitor (KSBTI) and used in an inhibition enzyme immunoassay (EIA). The inhibition EIA was as sensitive as competetive EIAs and was easily modified for other protein-antibody interactions. The KSBTI assay described detected KSBTI in complex mixtures from 100 μg/ml to 50 ng/ml and did not react with the Bowman-Birk trypsin inhibitor. The assay was used to examine levels of KSBTI inGlycine max hypocotyl-derived callus tissue. The developing hypocotyls contained 0.21 μg KSBTI per mg of fresh tissue. This level of KSBTI rapidly decreased when placed in culture and was undetectable 6 days later. The decrease in KSBTI correlated with the development of callus.
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