Tarasova MV, Kuznetsov VV, Netesova NA, Gonchar DA, Degtyarev SK. Recombinant DNA-methyltransferase M1.BspACI from Bacillus psychrodurans AC: purification and properties.
BIOCHEMISTRY (MOSCOW) 2011;
75:1484-90. [PMID:
21314619 DOI:
10.1134/s0006297910120096]
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Abstract
A restriction-modification system from Bacillus psychrodurans AC (recognition sequence 5'-CCGC-3') comprises two DNA methyltransferases: M1.BspACI and M2.BspACI. The bspACIM1 gene was cloned in the pJW2 vector and expressed in Escherichia coli cells. High-purity M1.BspACI preparation has been obtained by chromatography on different carriers. M1.BspACI has a temperature optimum of 30°C and demonstrates maximum activity at pH 8.0. M1.BspACI modifies the first cytosine in the recognition sequence 5'-CCGC-3'. The kinetic parameters of M1.BspACI DNA methylation are as follows: K(m) for phage λ DNA is 0.053 µM and K(m) for S-adenosyl-L-methionine is 5.1 µM. The catalytic constant (k(cat)) is 0.095 min(-1).
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