A series of 7-substituted 7-deazaadenine and 5-substituted cytosine 2'-deoxyribonucleoside triphosphates (dNTPs) were tested for their competitive incorporations (in the presence of dATP and dCTP) into DNA by several DNA polymerases by using analysis based on cleavage by restriction endonucleases. 7-Aryl-7-deazaadenine dNTPs were more efficient substrates than dATP because of their higher affinity for the active site of the enzyme, as proved by kinetic measurements and calculations.

Institute of Organic Chemistry and Biochemistry Academy of Sciences of the Czech Republic Gilead Sciences and IOCB Research Center Flemingovo nám 2 16610 Prague 6 http www uochb cas cz hocekgroup

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