Bacillus subtilis	YefA; gene yefA	720592	
Bacillus subtilis 168	YefA; gene yefA	720592	
Escherichia coli	-	705956	
Escherichia coli	gene rlmC	721031	
Pyrococcus abyssi	-	721031	
Streptococcus pneumoniae	-	734806	
Streptococcus pneumoniae	introduces C5 methylation at both U747 and U1939 of the 23S ribosomal RNA, i. e. catalyzes both the reactions of EC 2.1.1.189 and EC 2.1.1.190; serotype 4	758157, 758197	
Streptococcus pneumoniae ATCC BAA-334	introduces C5 methylation at both U747 and U1939 of the 23S ribosomal RNA, i. e. catalyzes both the reactions of EC 2.1.1.189 and EC 2.1.1.190; serotype 4	758157, 758197	
Streptococcus pneumoniae S1	-	734806