Table 1.
Sequence comparisons of HsdR and HsdM subunits
| EcoA0ORF42P | ||
| R-M system | HsdR | HsdM |
| CfrAI | NA | 72/62 aa1 |
| EcoAI | 99 | 98 |
| EcoEI | 77 | 90 |
| StySKI | 92/219 aa | 96 |
| EcoO157ORF5947P | 99 | 99 |
| EcoKO157ORF5307P | 99 | 99 |
| EcoCFTORF5424P | 99 | 99 |
| EcoKI | 26 | 28 |
The R-M systems CfrAI, EcoAI and EcoEI are prototypes of Type IB family, StySKI identifies the first member of the IB family in Salmonella species [38], EcoKI is a prototype member of Type IA [39]. The values are the per cent identity of aligned sequences. EcoA0ORF42P is from E. coli A0 34/86 (O83: K24: H31), EcoO157ORF5947P is from E. coli O157:H7, EcoKO157ORF5307P is from E. coli O157:H7 Sakai strain [40] and EcoCFTORF5424P is from E. coli CFTO73. P means putative R-M system, NA – the sequence is not available, 1 alignment of the number of aa so far available