title: E. coli Ada regulatory protein repairs the SP diastereoisomer of alkylated DNA.
abstract: Using HPLC and 31P NMR spectroscopy on a chemically synthesized asymmetric mixture of the diastereoisomers of thymidyl(3'----5')thymidyl-O-methyl phosphate absolute configuration has been correlated with chromatographic mobility. The methyl phosphotriester system in alkylated DNA which is repaired by the Ada regulatory protein of E. coli has consequently been established to possess the Sp configuration.
mesh_terms: D000478:Alkylation; D001426:Bacterial Proteins / Q000378:metabolism*; D002851:Chromatography, High Pressure Liquid; D004260:DNA Repair; D004121:Dimethyl Sulfoxide; D004926:Escherichia coli / Q000032:analysis*; D009682:Magnetic Resonance Spectroscopy; D013237:Stereoisomerism; D013329:Structure-Activity Relationship
chemical_list: D001426:Bacterial Proteins; D004121:Dimethyl Sulfoxide