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Substrate Specificity and Biochemical Properties of M3.BstF5I DNA Methyltransferase from the BstF5I Restriction–Modification System

V. A. Chernukhin1*, V. V. Kuznetsov2, D. A. Gonchar1, Yu. G. Kashirina1, N. A. Netesova2, and S. Kh. Degtyarev1

1Sibenzyme Ltd., ul. Timakova 2/12, 630117 Novosibirsk, Russia; fax: (383) 333-6853; E-mail: valera@sibenzyme.ru

2FSRI State Research Center of Virology and Biotechnology “Vector”, 630559 Koltsovo, Novosibirsk Region, Russia; fax: (383) 336-7409; E-mail: ninanet@vector.nsc.ru

* To whom correspondence should be addressed.

Received October 3, 2008; Revision received January 21, 2009
Optimal conditions for DNA methylation by the M3.BstF5I enzyme from Bacillus stearothermophilus and kinetic parameters of λ phage DNA modification and that of a number of oligonucleotide substrates are established. Comparison of M1.BstF5I and M3.BstF5I kinetic parameters revealed that with similar temperature optima and affinity for DNA, M3.BstF5I has nearly fourfold lower turnover number (0.24 min–1) and modifies the hemimethylated recognition site with lower efficiency under optimal conditions than the unmethylated one. In contrast to another three methylases of the BstF5I restriction–modification system, the M3.BstF5I enzyme is able to optionally modify the noncanonical 5′-GGATC-3′ DNA sequence with a rate more than one order of magnitude lower than the methylation rate of the canonical 5′-GGATG-3′ recognition site.
KEY WORDS: DNA methyltransferase, enzyme kinetics, site specificity

DOI: 10.1134/S006297910010086