Table 5.
Four distinct types of restriction–modification systems in the studied S. Typhimurium genomes. +, identified; − unidentified; *, undetermined.
| Type I Restriction Modification System | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Gene | Function | Recognition Sequence | DP_F10 (DT104b) |
DP_N16 (DT104b) |
DP_N28 (DT104b) |
JE_2727 (DT104b) |
DT104b ref. (DT104b) |
JM_04.26 (DT104) |
MC_04-0529 (DT104) |
R13 (DT104) |
TM75-404 (DT104) |
DT104 ref. (DT104) |
LT2 (DT4) |
| StyUK1IIP | Restriction enzyme | GAGNNNNNNRTAYG | + | + | + | + | + | + | + | + | + | + | − |
| SenLT2IIP | Restriction enzyme | GAGNNNNNNRTAYG | − | − | − | − | − | − | − | − | − | − | + |
| M.SenTFII | Methyltransferase | GAGNNNNNNRTAYG | + | + | + | + | − | + | + | + | + | + | + |
| M.Sen1899II | Methyltransferase | GAGNNNNNNRTAYG | − | − | − | − | + | − | − | − | − | − | − |
| S.StyUK1II | Specificity subunit | GAGNNNNNNRTAYG | + | + | + | + | + | + | + | + | + | + | + |
| Type II Restriction Modification System | |||||||||||||
| Sty13348III Type IIG | Restriction enzyme/Methyltransferase | GATCAG | + | + | + | + | − | + | + | + | + | + | − |
| M.SenAboDcm | Methyltransferase | CCWGG | + | + | + | + | + | + | + | + | + | + | + |
| M.Sen641III | Methyltransferase | ATGCAT | + | + | + | + | + | + | + | + | + | + | + |
| M.StyUK1V | Methyltransferase | * | + | + | + | + | + | + | + | + | + | + | − |
| StyUK1IV Type IIG | Restriction enzyme/Methyltransferase | GATCAG | − | − | − | − | + | − | − | − | − | − | + |
| Type III Restriction Modification System | |||||||||||||
| M.StyUK1I | Methyltransferase | CAGAG | + | + | + | + | + | + | + | + | + | + | + |
| SenAZII | Restriction enzyme | CAGAG | + | + | + | + | + | + | + | + | + | + | + |
| Type IV Restriction Modification System | |||||||||||||
| StyLT2Mrr | Methyl-directed restriction enzyme | * | + | + | + | + | + | + | + | + | + | + | + |