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A sensitive non-isotopic assay for specific detection of reverse transcriptase (RT) of the human immunodeficiency virus type 1 (HIV-1) is described using 5-bromo-2'-deoxyuridine triphosphate (BrdUTP) instead of tritiated thymidine triphosphate. After the RT reaction the template primer is degraded by alkaline hydrolysis. Single-stranded poly.(BrdU) is detected in an immunoenzymometric assay using monoclonal anti-BrdU antibodies. The specificity of the assay is demonstrated by the isolation of RT from virus lysate by an insolubilised monoclonal anti-HIV-1 RT antibody prior to the RT reaction. Immunological RT binding leads to a tenfold increase in analytical sensitivity since substances inhibiting the RT reaction can be removed. This non-isotopic assay is some 30 times more sensitive than the classical radioisotopic RT assay. In terms of RT determination, however, there is a good correlation between these tests (r = 0.96). Several filtrations are no longer necessary to remove non-incorporated nucleotides. The test can be adapted to microtitre plates and hence is easy to automate.
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