Renders M, Lievrouw R, Krecmerová M, Holý A, Herdewijn P. Enzymatic polymerization of phosphonate nucleosides.
Chembiochem 2009;
9:2883-8. [PMID:
19006151 DOI:
10.1002/cbic.200800494]
[Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
5'-O-phosphonomethyl-2'-deoxyadenosine (PMdA) proved to be a good substrate of the Therminator polymerase. In this article, we investigated whether the A, C, T and U analogues of this phosphonate nucleoside (PMdN) series can function as substrates of natural DNA polymerases. PMdT and PMdU could only be polymerized enzymatically to a limited extent. Nevertheless, PMdA and PMdC could be incorporated into a DNA duplex with complete chain elongation by all the DNA polymerases tested. A mixed sequence of four nucleotides containing modified C, T and A residues could be obtained with the Vent(exo(-)) and Therminator polymerases. The kinetic values for the incorporation of PMdA by Vent(exo(-)) polymerase were determined; a reduced K(M) value was found for the incorporation of PMdA compared to the natural substrate. Future polymerase directed evolution studies will allow us to select an enzyme with a heightened capacity to process these modified DNA building blocks into modified strands.
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