Abstract
An ELISA is described for the detection of HIV-1 protease activity using an immobilized gag-related polyprotein as substrate. Proteolytic activity was demonstrated with either bacterial lysates expressing HIV-1 protease or purified protease. No cleavage was observed with a protein preparation from control bacteria not expressing HIV-1 protease. Under these conditions the aspartyl-type protease inhibitor, pepstatin A, was found to inhibit HIV-1 protease cleavage by > 90% at a concentration of 0.1 mM. This assay may be a useful tool for the study of both synthetic and natural inhibitors of HIV-1 protease.
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