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  • Title: Expression and characterization of human foamy virus proteinase.
    Author: Fenyöfalvi G, Bagossi P, Copeland TD, Oroszlan S, Boross P, Tözsér J.
    Journal: FEBS Lett; 1999 Dec 03; 462(3):397-401. PubMed ID: 10622733.
    Abstract:
    The human foamy virus proteinase was expressed in fusion with maltose binding protein in Escherichia coli and purified. The specific activity of the fusion protein was similar to that of the processed enzyme. The kinetic constants on foamy virus cleavage site substrates were very low but comparable to those obtained with the gag-encoded avian proteinase on its own substrates. The proteinase showed preference for high ionic strength and a pH optimum of 6.6. None of the tested retroviral cleavage site peptides were substrates, however, some peptides representing cleavage sites in retrotransposons were properly processed by the enzyme.
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