Partial purification of ribosomal RNA(m1G)- and rRNA(m2G)-methylases from Escherichia coli and demonstration of some proteins affecting their apparent activity.

Ammonium Sulfate Bacterial Proteins Carbon Isotopes Chemical Precipitation Chloromercuribenzoates Chromatography, Gel Chromatography, Ion Exchange Enzyme Activation Escherichia coli/enzymology Genetics, Microbial Guanine Nucleotides Kinetics Methyltransferases/antagonists & inhibitors,isolation & purification Mutation Papain RNA, Ribosomal Ribonucleases S-Adenosylmethionine Trypsin Ultracentrifugation

Bacterial Proteins Carbon Isotopes Chloromercuribenzoates Guanine Nucleotides RNA, Ribosomal S-Adenosylmethionine Methyltransferases Ribonucleases Trypsin Papain Ammonium Sulfate