Methylation by a mutant T2 DNA [N6-adenine] methyltransferase expands the usage of RecA-assisted endonuclease (RARE) cleavage

Irina Minko, Stanley Hattman, Robert (Stephen) Lloyd, Valeri Kossykh

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Properties of a mutant bacteriophage T2 DNA [N6-adenine] methyltransferase (T2 Dam MTase) have been investigated for its potential utilization in RecA-assisted restriction endonuclease (RARE) cleavage. Steady-state kinetic analyses with oligonucleotide duplexes revealed that, compared to wild-type T4 Dam, both wild-type T2 Dam and mutant T2 Dam P126S had a 1.5-fold higher Kcat in methylating canonical GATC sites. Additionally, T2 Dam P126S showed increased efficiencies in methylation of non-canonical GAY sites relative to the wild-type enzymes. In agreement with these steady-state kinetic data, when bacteriophage λ DNA was used as a substrate, maximal protection from restriction nuclease cleavage in vitro was achieved on the sequences GATC, GATN and GACY, while protection of GACR sequences was less efficient. Collectively, our data suggest that T2 Dam P126S can modify 28 recognition sequences. The feasibility of using the mutant enzyme in RARE cleavage with BclI and EcoRV endonucleases has been shown on phage λ DNA and with BclI and DpnII endonucleases on yeast chromosomal DNA embedded in agarose.

Original languageEnglish (US)
Pages (from-to)1484-1490
Number of pages7
JournalNucleic Acids Research
Volume29
Issue number7
StatePublished - Apr 1 2001
Externally publishedYes

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Endonucleases
DNA Restriction Enzymes
Methyltransferases
Adenine
Methylation
DNA
Bacteriophages
Bacteriophage T4
Enzymes
Oligonucleotides
Sepharose
Yeasts
endodeoxyribonuclease BclI

ASJC Scopus subject areas

  • Genetics

Cite this

Methylation by a mutant T2 DNA [N6-adenine] methyltransferase expands the usage of RecA-assisted endonuclease (RARE) cleavage. / Minko, Irina; Hattman, Stanley; Lloyd, Robert (Stephen); Kossykh, Valeri.

In: Nucleic Acids Research, Vol. 29, No. 7, 01.04.2001, p. 1484-1490.

Research output: Contribution to journalArticle

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