title: Model of inhibition of Thermus aquaticus polymerase and Moloney murine leukemia virus reverse transcriptase by tea polyphenols (+)-catechin and (-)-epigallocatechin-3-gallate.
abstract: Non-nutritional polyphenolic compounds such as (+)-catechin and (-)-epigallocatechin-3-gallate (EGCG) are known as anticancer chemopreventive agents and have been utilised for medical purposes in form of tea drinking. Documented anticancer properties of these compounds result from their antioxidant effects. However, also direct alteration of an enzyme performance has been reported and deserves more attention. In this paper, a direct effect of catechin and EGCG on the performance of reverse transcription (RT) and/or polymerase chain reaction (PCR) was studied. Both tea polyphenolic compounds were added into real-time RT-PCR reactions and the fluorescence data obtained were fitted with a mathematical model. Several parameters of PCR performance were compared, obtained from the mathematical model for reactions with and without addition of (+)-catechin and EGCG. Addition of EGCG to enzyme reaction seems to inhibit the RT reaction (p < 0.05) and to slow down the DNA polymerase reaction (p < 0.001). Similarly, (+)-catechin inhibited the DNA amplification (p < 0.01) but had no effect on the RT reaction. The effects could be observed in physiological flavanol concentrations ranging from 10(-5) to 10(-8)M.
authors.affiliation: Physiology Weihenstephan, Zentralinstitut für Ernährung-und Lebensmittel-forschung, Technische Universität München, D-85350 Freising, Germany.
authors.forename: Ales
authors.initials: A
authors.lastname: Tichopad
authors.forename: Jürgen
authors.initials: J
authors.lastname: Polster
authors.forename: Ladislav
authors.initials: L
authors.lastname: Pecen
authors.forename: Michael W
authors.initials: MW
authors.lastname: Pfaffl
mesh_terms: D000818:Animals; D016588:Anticarcinogenic Agents / Q000008:administration & dosage / Q000494:pharmacology* / Q000627:therapeutic use; D002392:Catechin / Q000008:administration & dosage / Q000031:analogs & derivatives / Q000494:pharmacology / Q000627:therapeutic use; D005419:Flavonoids / Q000008:administration & dosage / Q000494:pharmacology / Q000627:therapeutic use; D051379:Mice; D008979:Moloney murine leukemia virus / Q000201:enzymology*; D010636:Phenols / Q000008:administration & dosage / Q000494:pharmacology / Q000627:therapeutic use; D008517:Phytotherapy; D059808:Polyphenols; D012194:RNA-Directed DNA Polymerase / Q000187:drug effects*; D018894:Reverse Transcriptase Inhibitors / Q000008:administration & dosage / Q000494:pharmacology* / Q000627:therapeutic use; D020133:Reverse Transcriptase Polymerase Chain Reaction; D019914:Taq Polymerase / Q000187:drug effects*; D013662:Tea
chemical_list: D016588:Anticarcinogenic Agents; D005419:Flavonoids; D010636:Phenols; D059808:Polyphenols; D018894:Reverse Transcriptase Inhibitors; D013662:Tea; D002392:Catechin; C045651:epigallocatechin gallate; D019914:Taq Polymerase; D012194:RNA-Directed DNA Polymerase