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1996-01-30
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Document 0205
DOCN M9610205
TI Inhibition of the integrase of human immunodeficiency virus (HIV) type 1
by anti-HIV plant proteins MAP30 and GAP31.
DT 9601
AU Lee-Huang S; Huang PL; Huang PL; Bourinbaiar AS; Chen HC; Kung HF;
Department of Biochemistry, New York University School of; Medicine, NY
10016, USA.
SO Proc Natl Acad Sci U S A. 1995 Sep 12;92(19):8818-22. Unique Identifier
: AIDSLINE MED/96004630
AB MAP30 (Momordica anti-HIV protein of 30 kDa) and GAP31 (Gelonium
anti-HIV protein of 31 kDa) are anti-HIV plant proteins that we have
identified, purified, and cloned from the medicinal plants Momordica
charantia and Gelonium multiflorum. These antiviral agents are capable
of inhibiting infection of HIV type 1 (HIV-1) in T lymphocytes and
monocytes as well as replication of the virus in already-infected cells.
They are not toxic to normal uninfected cells because they are unable to
enter healthy cells. MAP30 and GAP31 also possess an N-glycosidase
activity on 28S ribosomal RNA and a topological activity on plasmid and
viral DNAs including HIV-1 long terminal repeats (LTRs). LTRs are
essential sites for integration of viral DNA into the host genome by
viral integrase. We therefore investigated the effect of MAP30 and GAP31
on HIV-1 integrase. We report that both of these antiviral agents
exhibit dose-dependent inhibition of HIV-1 integrase. Inhibition was
observed in all of the three specific reactions catalyzed by the
integrase, namely, 3' processing (specific cleavage of the dinucleotide
GT from the viral substrate), strand transfer (integration), and
disintegration (the reversal of strand transfer). Inhibition was studied
by using oligonucleotide substrates with sequences corresponding to the
U3 and U5 regions of HIV LTR. In the presence of 20 ng of viral
substrate, 50 ng of target substrate, and 4 microM integrase, total
inhibition was achieved at equimolar concentrations of the integrase and
the antiviral proteins, with EC50 values of about 1 microM. Integration
of viral DNA into the host chromosome is a vital step in the replicative
cycle of retroviruses, including the AIDS virus. The inhibition of HIV-1
integrase by MAP30 and GAP31 suggests that impediment of viral DNA
integration may play a key role in the anti-HIV activity of these plant
proteins.
DE Antiviral Agents/*PHARMACOLOGY Base Sequence Comparative Study DNA
Nucleotidyltransferases/*ANTAGONISTS & INHIB/METABOLISM HIV Long
Terminal Repeat HIV-1/*ENZYMOLOGY/GENETICS Molecular Sequence Data
Nucleic Acid Conformation Plant Proteins/*PHARMACOLOGY Recombinant
Proteins/PHARMACOLOGY Substrate Specificity Support, U.S. Gov't,
P.H.S. Virus Integration/*DRUG EFFECTS JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).