Escherichia coli Proteins/metabolism; Methyltransferases/metabolism; One-Carbon Group Transferases/metabolism; RNA, Transfer/genetics; RNA, Transfer/metabolism; S-Adenosylmethionine/analogs & derivatives; S-Adenosylmethionine/chemistry; S-Adenosylmethionine/metabolism; Biocatalysis; Biosynthetic Pathways; Catalytic Domain; Crystallography, X-Ray; Cyclohexanecarboxylic Acids/metabolism; Cyclohexenes/metabolism; Escherichia coli/enzymology; Escherichia coli Proteins/chemistry; Escherichia coli Proteins/genetics; Ligands; Methyltransferases/deficiency; Methyltransferases/genetics; Models, Molecular; Molecular Weight; One-Carbon Group Transferases/chemistry; Protein Multimerization; Protein Structure, Secondary; RNA, Bacterial/chemistry; RNA, Bacterial/genetics; RNA, Bacterial/metabolism; RNA, Transfer/chemistry; S-Adenosylmethionine/biosynthesis; Uridine/analogs & derivatives; Uridine/chemistry; Uridine/metabolism