Three groups with different routes of human immunodeficiency virus type 1 (HIV-1) transmission (homosexual men, hemophiliacs, and children) were studied for serum antibodies to a recombinant form of the HIV-1 protease using an enzyme-linked immunoassay. At 1 year after seroconversion, defined as the moment antibodies to HIV-1 proteins were first detected, 56% (34/61) of the homosexual men had a...

The protease from simian immunodeficiency virus (SIV) was chemically synthesized by automated solid-phase technology as an NH2-terminally extended derivative, capped with biotin. Biotin-linker-(SIV protease (1-99)): the linker segment, Gly-Gly-Asp-Arg-Gly-Phe-Ala-Ala, corresponds to the amino acid sequence preceding that of the protease in the SIV gag/pol precursor polyprotein. Accordingly, the...

Human immunodeficiency virus type 1 (HIV-1) and HIV-2 proteases are dimers of identical subunits. We made a construct for the expression of recombinant one-chain HIV-2 protease dimer, which, like the previously described one-chain HIV-1 protease dimer, is fully active. The constructs for the one-chain dimers of HIV-1 and HIV-2 proteases were modified to produce hybrid one-chain dimers consistin...

Increased susceptibility to the protease inhibitors saquinavir and amprenavir has been observed in human immunodeficiency virus type 1 (HIV-1) with specific mutations in protease (V82T and N88S). Increased susceptibility to ritonavir has also been described in some viruses from antiretroviral agent-naive patients with primary HIV-1 infection in association with combinations of amino acid change...

background and aims: coxsackievirus b3 (cvb3) is the most common agent known to cause viral myocarditis. the viral genome encodes a single polyprotein that is cleaved to produce several proteins by virally encoded proteases. most of this proteolytic processing is catalyzed by a cysteine protease called 3c. the 3c protease plays major role in viral replication and cellular damage. methods: to un...