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J. Biol. Chem., Vol. 262, Issue 26, 12393-12396, Sep, 1987
J Hansen, T Schulze and K Moelling
The reverse transcriptase polymerase of the human T-cell lymphotropic
virus/lymphadenopathy-associated virus has been cloned into an expression
vector and expressed in Escherichia coli. Two polypeptides of 66 and 51 kDa
molecular mass are detectable in polymerase-expressing bacterial lysates
with human patient sera. They are processed from a short-lived 120-kDa
polyprotein precursor equivalent to a region consisting of polymerase,
protease, and endonuclease. The 51 kDa protein appears to originate from
the 66-kDa molecule; additional processing products are 32- and 15-kDa
proteins. The bacterially expressed polymerase is enzymatically active and
exhibits the template specificities, ion requirements, and response to
inhibitors of the authentic enzyme. It was purified by DEAE-cellulose-,
phosphocellulose- , and poly(rC)-agarose column chromatography followed by
glycerol density gradient centrifugation. It copurifies with an RNase H
activity, suggesting the existence of a virus-coded DNA polymerase- RNase H
complex. The purified bacterial enzyme allows a safe large- scale screening
for inhibitors of both activities.
RNase H activity associated with bacterially expressed reverse transcriptase of human T-cell lymphotropic virus III/lymphadenopathy- associated virus
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