title: [The inhibitory effects of catechin derivatives on the activities of human immunodeficiency virus reverse transcriptase and DNA polymerases].
abstract: Catechin derivatives including (-)-epicatechin gallate (ECG), (-)-epigallocatechin gallate (EGCG), (-)-epigallocatechin (EGC) and green tea extract (GTE) were found to inhibit the activities of cloned human immunodeficiency virus type 1 reverse transcriptase (HIV-1 RT), duck hepatitis B virus replication complexes reverse transcriptase (DHBV RCs RT), herpes simplex virus 1 DNA polymerase (HSV-1 DNAP) and cow thymus DNA polymerase alpha (CT DNAP alpha). EGCG and ECG were shown to be very potent inhibitors of HIV-1 RT. According to the IC50 values for HIV-1 RT, these compounds can be ordered as EGCG 0.0066 mumol/L > ECG 0.084 mumol/L > GTE 0.1 microgram/ml > EGC 7.2 mumol/L. DHBV RCs RT was the least sensitive to these compounds. Kinetic study showed that EGCG exerts a mixed inhibition with respect to external template inducer poly (rA).oligo (dT) 12-18 and a noncompetitive inhibition with respect to substrate dTTP for HIV-1 RT. Bovine serum albumin significantly reduced the inhibitory effects of catechin analogues and GTE on HIV-1 RT. In tissue culture GTE inhibited the cytopathic effect of coxsackie B3 virus, but did not inhibit the cytopathic effects of HSV-1, HSV-2, influenza A or influenza B viruses.
authors.affiliation: Institute of Medical Biotechnology, Beijing.
authors.forename: P
authors.initials: P
authors.lastname: Tao
mesh_terms: D000818:Animals; D000998:Antiviral Agents / Q000494:pharmacology*; D002392:Catechin / Q000031:analogs & derivatives* / Q000494:pharmacology; D004259:DNA-Directed DNA Polymerase / Q000378:metabolism*; D029822:Enterovirus B, Human / Q000187:drug effects; D005419:Flavonoids / Q000494:pharmacology*; D054303:HIV Reverse Transcriptase; D015497:HIV-1 / Q000201:enzymology*; D006801:Humans; D010936:Plant Extracts / Q000494:pharmacology; D012194:RNA-Directed DNA Polymerase / Q000378:metabolism; D018894:Reverse Transcriptase Inhibitors; D018139:Simplexvirus / Q000201:enzymology; D013662:Tea; D014709:Vero Cells / Q000382:microbiology
chemical_list: D000998:Antiviral Agents; D005419:Flavonoids; D010936:Plant Extracts; D018894:Reverse Transcriptase Inhibitors; D013662:Tea; D002392:Catechin; C062669:epicatechin gallate; C045651:epigallocatechin gallate; D054303:HIV Reverse Transcriptase; D012194:RNA-Directed DNA Polymerase; D004259:DNA-Directed DNA Polymerase; C057580:gallocatechol