Romanenkov AS, Kisil OV, Zatsepin TS, Iamskova OV, Kariagina AS, Metelev VG, Oretskaia TS, Kubareva EA. DNA-methyltransferase SsoII as a bifunctional protein: Features of the interaction with the promoter region of SsoII restriction-modification genes.
BIOCHEMISTRY (MOSCOW) 2006;
71:1341-9. [PMID:
17223787 DOI:
10.1134/s0006297906120091]
[Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
DNA duplexes bearing an aldehyde group at the 2'-position of the sugar moiety were used for affinity modification of (cytosine-5)-DNA methyltransferase SsoII. It is shown that lysine residues of M.SsoII N-terminal region are located in proximity to DNA sugar-phosphate backbone of a regulatory sequence of promoter region of SsoII restriction-modification enzyme coding genes. The ability of the two M.SsoII subunits to interact with DNA regulatory sequence has been demonstrated by affinity modification using DNA duplexes with two 2'-aldehyde groups. Changes in nucleotide sequence of one half of the regulatory region prevented cross-linking of the second M.SsoII subunit. The results on sequential affinity modification of M.SsoII by two types of modified DNA ligands (i.e. by 2'-aldehyde-containing and phosphoryldisulfide-containing) have demonstrated the possibility of covalent attachment of the protein to two different DNA recognition sites: regulatory sequence and methylation site.
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