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English Wikipedia
Mismatched Primer Extension Assays
#MMPMID27081667
Achuthan V
; DeStefano JJ
Bio Protoc
2015[Jun]; 5
(12
): ä PMID27081667
show ga
Steady state kinetic assays have been a reliable way to estimate fidelity of
several polymerases (Menendez-Arias, 2009; Rezende and Prasad, 2004; Svarovskaia
et al., 2003). The ability to analyze the extension of primers with specific
mismatches at the 3' end is a major strength of the mismatched primer extension
assays. Recently, we used the mismatched primer extension assays to show that the
fidelity of HIV RT increases dramatically when concentration of Mg(2+) is reduced
to a physiologically relevant concentration (~0.25 mM) (Achuthan et al., 2014).
Here, we describe in detail how to perform the mismatched primer extension assay
to measure the standard extension efficiency using human immunodeficiency virus
reverse transcriptase (HIV RT) at 2 mM Mg(2+). The relative fidelity of the
polymerase can then be estimated using the standard extension efficiency. The
assay described here is based on the method published in Mendelman et al. (1990).