title: [Cobalamins and tRNA methyltransferase activity in E. coli cells].
abstract: The end of the logarithmic phase of growth of E. coli 113-3 cells in a mineral medium with methylcobalamin (MeCbl) occurs 60 minutes earlier than in the case of cells grown with cyancobalamin (CNCbl). Chromatography on a Sephadex - DEAE cellulose column of the 105 000xg fractions of cell-free extracts of the cells grown in the presence of MeCbl showed both quantitative and qualitative differences. The ability of individual protein fractions to transfer the 14CH3-groups from the Adomet to submethylated tRNA of E. coli K12W6 in the cells grown with MeCbl increases 1.5 - 3-fold in comparison with those grown with CNCbl. A chromatographic analysis of methylated bases of tRNA did not show any qualitative differences. In the presence of MeCbl the incorporation of the CH3-groups into m7G is increased by 50%.
mesh_terms: D004926:Escherichia coli / Q000187:drug effects / Q000201:enzymology*; D007700:Kinetics; D012436:S-Adenosylmethionine / Q000378:metabolism; D014805:Vitamin B 12 / Q000031:analogs & derivatives / Q000494:pharmacology*; D012359:tRNA Methyltransferases / Q000378:metabolism*
chemical_list: D012436:S-Adenosylmethionine; C019476:mecobalamin; D012359:tRNA Methyltransferases; D014805:Vitamin B 12
vernacular_title: Kobalaminy i tRNK-metiltransferaznaia aktovnost'kletok E. coli.