In vitro: |
Japanese Journal of Pharmacognosy , 1991 , 45 (3) :240-254. | Effects of Flavonoids and Alkaloids on Reverse Transcriptase[Reference: WebLink] |
METHODS AND RESULTS:
One hundred-ninety flavonoids and 75 alkaloids were studied for their inhibitory effects on the Avian Myeloblastosis Virus reverse transcriptase (AMV-RT) by using (rA)_n-p(dT)_<12-18> or (rC)_n-p(dG)_<12-18> as a template-primer.
Of the flavonoids tested, 6-hydroxyluteolin (50), pedalitin (52), 6-hydroxykaempferol (109) and quercetagetin (129), were the most potent inhibitors with IC_<50>≦10 μM. Five other flavonoids, baicalein (19), Baicalin methyl ester (23), scutellarein (33), myricetin (126) and gossypetin (130), gave IC_<50> between 35 and 200 μM. The kinetic studies on 50, 126 and 130 gave the inhibitory constants (K_i) of 10, 94 and 90 μM, respectively, with respect to the substrate and 5, 200 and 100 μM, respectively, with respect to the template-primer.
Structurally different alkaloids such as isoquinoline, indol, steroidal, quinolizidine, pyrrolizidine, pyridine and imidazole alkaloids were also investigated for the activity and berberine type alkaloids were shown to have a strong inhibitory activity.
CONCLUSIONS:
Flavonoids or alkaloids that inhibited AMV-RT did not show any significant effect on DNA-polymerase I. |
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