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M9610043.TXT
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1996-01-30
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Document 0043
DOCN M9610043
TI Characterization of endonucleolytic activity of HIV-1 integrase using a
fluorogenic substrate.
DT 9601
AU Lee SP; Censullo ML; Kim HG; Knutson JR; Han MK; Department of
Biochemistry and Molecular Biology, Georgetown; University Medical
Center, Washington, DC 20007, USA.
SO Anal Biochem. 1995 May 20;227(2):295-301. Unique Identifier : AIDSLINE
MED/96023410
AB Retroviruses require viral DNA to be synthesized by reverse
transcription in the cytoplasm followed by integration of the resulting
viral DNA into the host chromosome in the nucleus. Reverse transcription
and integration, essential steps in the life cycle of retroviruses, are
possible targets in the development of antiviral reagents. One
attractive target is the integrase protein, a product of the retroviral
pol gene which is solely responsible for the retroviral integration
process through cutting and joining reactions. When screening for
massive numbers of antiviral agents, a rapid and precise assay is ideal.
We report the application of fluorescence resonance energy transfer
(FRET) with fluorescein and eosin as the energy transfer pair to
characterize HIV-IN-mediated DNA cleavage reactions. Past concerns with
applications of FRET to DNA were due to interactions of the fluorophore
with the DNA, resulting in quenched fluorescence. However, in this study
these concerns have been resolved with the use of a nucleotide analog
with a 12-carbon linker arm, 5-amino (12)-2'-deoxyuridine
beta-cyanoethyl phosphoramidite. Steady-state fluorescence studies show
that cleavage of the fluorogenic substrate by integrase results in
enhancement of quenched donor fluorescence intensity. The fluorescence
assay was confirmed by autoradiographic analysis of the cleavage
reaction with radiolabeled fluorogenic substrate. This fluorescence
assay will facilitate both detailed kinetic studies and the rapid
screening of novel integrase inhibitors.
DE Base Sequence Deoxyuridine/ANALOGS & DERIVATIVES DNA/CHEMISTRY
Endodeoxyribonucleases/*ANALYSIS Energy Transfer Eosine
Yellowish-(YS)/*CHEMISTRY Fluoresceins/*CHEMISTRY Fluorescent Dyes
Molecular Sequence Data Spectrometry, Fluorescence Support, Non-U.S.
Gov't JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).