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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).
-
-