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The M.EcoRV DNA-(adenine N6)-methyltransferase uses DNA bending for recognition of an expanded EcoDam recognition site

Jurkowski, Tomasz P, Anspach, Nils, Kulishova, Liliya, Nellen, Wolfgang and Jeltsch, Albert 2007. The M.EcoRV DNA-(adenine N6)-methyltransferase uses DNA bending for recognition of an expanded EcoDam recognition site. Journal of Biological Chemistry 282 (51) , 36942—36952. 10.1074/jbc.m706933200

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Abstract

The M.EcoRV DNA methyltransferase recognizes GATATC sites. It is related to EcoDam, which methylates GATC sites. The DNA binding domain of M.EcoRV is similar to that of EcoDam suggesting a similar mechanism of DNA recognition. We show that amino acid residue Lys11 of M.EcoRV is involved in recognition of Gua1 and Arg128 contacts the Gua in base pair 6. These residues correspond to Lys9 and Arg124 in EcoDam, which recognize the Gua residues in both strands of the Dam recognition sequence, indicating that M.EcoRV and EcoDam make similar contacts to outermost base pairs of their recognition sequences and M.EcoRV recognizes its target site as an expanded GATC site. In contrast to EcoDam, M.EcoRV considerably bends the DNA (59 ± 4°) suggesting indirect readout of the AT-rich inner sequence. Recognition of an expanded target site by DNA bending is a new principle for changing DNA recognition specificity of proteins during molecular evolution. R128A is inefficient in DNA bending and binding, whereas K11A bends DNA with relaxed sequence specificity. These results suggest a temporal order of the formation of protein-DNA contacts in which the Gua6–Arg128 contact forms early followed by DNA bending and, finally, the formation of the Lys11–Gua1 contact.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Biosciences
Publisher: American Society for Biochemistry and Molecular Biology
ISSN: 0021-9258
Last Modified: 01 Feb 2019 14:01
URI: http://orca.cf.ac.uk/id/eprint/118978

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