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• W2085777743 abstract "Prokaryote DNA methyltransferases (MTases) of the Dam family (including those of bacteriophages T2 and T4) catalyze methyl group transfer from S-adenosyl-L-methionine (AdoMet), producing S-adenosyl-L-homocysteine (AdoHcy) and methylated adenine residues in palindromic GATC sequences. Dam DNA MTases, as all site-specific enzymes interacting with polymeric DNA, require a mechanism of action that ensures a rapid search for specific targets for catalytic action, during both the initial and subsequent rounds of methylation. The results of pre-steady-state (reaction burst) and steady-state methylation analyses of individual targets permitted us to monitor the action of T4Dam, which has three degrees of freedom: sliding, reorientation and adaptation to the canonical GATC sequence. The salient results are as follows: (i) 40mer substrate duplexes containing two canonical GATC sites showed differential methylation of the potential targets, i.e., T4Dam exhibited a preference for one site/target, which may present the better 'kinetic trap' for the enzyme. (ii) Prior hemimethylation of the two sites made both targets equally capable of being methylated during the pre-steady-state reaction. (iii) Although capable of moving in either direction along double-stranded DNA, there are some restrictions on T4Dam reorientation/adaptation on 40mer duplexes." @default.
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• W2085777743 date "2007-01-01" @default.
• W2085777743 modified "2023-09-26" @default.
• W2085777743 title "Differential methylation kinetics of individual target site strands by T4Dam DNA methyltransferase" @default.
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• W2085777743 doi "https://doi.org/10.1515/bc.2007.142" @default.
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