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1996-02-27
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Document 0473
DOCN M9630473
TI Roles of oxygen and photoinduced acidification in the light-dependent
antiviral activity of hypocrellin A.
DT 9603
AU Fehr MJ; Carpenter SL; Wannemuehler Y; Petrich JW; Department of
Chemistry, Iowa State University, Ames, USA.
SO Biochemistry. 1995 Dec 5;34(48):15845-8. Unique Identifier : AIDSLINE
MED/96097011
AB Hypocrellin A displays photoinduced antiviral activity, in particular
against the human immunodeficiency virus (HIV), as does its counterpart,
hypericin. Although hypocrellin A, like hypericin, executes an
excited-state intramolecular proton transfer, it differs from hypericin
in two important ways. Unlike hypericin, hypocrellin A absolutely
requires oxygen for its antiviral activity. Also, whereas we have
previously demonstrated that hypericin functions as a light-induced
proton source, we do not observe that hypocrellin A acidifies its
surrounding medium in the presence of light. These results are discussed
in the context of the ground- and excited-state photophysics of
hypericin and its mechanisms of photoinduced virucidal activity.
DE Antiviral Agents/CHEMISTRY/*PHARMACOLOGY Hydrogen-Ion Concentration
HIV/DRUG EFFECTS *Light Oxygen/*METABOLISM Perylene/*ANALOGS &
DERIVATIVES/CHEMISTRY/PHARMACOLOGY Photochemistry
Quinones/CHEMISTRY/*PHARMACOLOGY 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).