Affinity modification of EcoRII DNA methyltransferase by the dialdehyde-substituted DNA duplexes: mapping the enzyme region that interacts with DNA |
| |
Authors: | Gritsenko Oksana M Koudan Elizaveta V Mikhailov Sergey N Ermolinsky Boris S Van Aerschot Arthur Herdewijn Piet Gromova Elizaveta S |
| |
Affiliation: | Department of Chemistry, Moscow State University, Moscow, 119992, Russia. |
| |
Abstract: | Affinity modification of EcoRII DNA methyltransferase (M x EcoRII) by DNA duplexes containing oxidized 2'-O-beta-D-ribofuranosylcytidine (Crib*) or 1-(beta-D-galactopyranosyl)thymine (Tgal*) residues was performed. Cross-linking yields do not change irrespective of whether active Crib* replaces an outer or an inner (target) deoxycytidine within the EcoRII recognition site. Chemical hydrolysis of M x EcoRII in the covalent cross-linked complex with the Tgal*-substituted DNA indicates the region Gly268-Met391 of the methylase that is likely to interact with the DNA sugar-phosphate backbone. Both specific and non-specific DNA interact with the same M x EcoRII region. Our results support the theoretically predicted DNA binding region of M x EcoRII. |
| |
Keywords: | |
本文献已被 PubMed 等数据库收录! |