Table 7.
Number of bacterial host genes homologous to genes associated with restriction-modification systems (10−3 threshold BLASTp search against the REBASE protein database).
| Restriction-modification system related genes (REBASE classifications*) | Bacteroides sp. AR20 | R. albus AR67 | S. equinus 2B | S. equinus Sb04 | S. equinus Sb17 |
|---|---|---|---|---|---|
| Putative control protein | 5 | 11 | 7 | 5 | 9 |
| Putative homing endonuclease | 8 | 6 | 8 | 8 | 8 |
| Homing endonuclease | 2 | ||||
| Putative orphan methyltransferase | 1 | 1 | 1 | 1 | 1 |
| Putative Type I restriction enzyme | 3 | 7 | 7 | 6 | 6 |
| Type I specificity subunit | 3 | 9 | |||
| Putative Type I specificity subunit | 15 | 13 | 9 | 9 | 11 |
| Type I methyltransferase | 8 | 7 | 9 | 8 | 8 |
| Putative Type I methyltransferase | 10 | 10 | 6 | 9 | 8 |
| Putative Type II specificity subunit | 1 | 1 | 1 | 1 | 1 |
| Type II methyltransferase | 1 | ||||
| Putative Type II methyltransferase | 23 | 44 | 22 | 20 | 19 |
| Putativetype II nicking endonuclease | 2 | 2 | 3 | 2 | 2 |
| Putative Type II restriction enzyme | 41 | 30 | 12 | 13 | 17 |
| putative Type II helicase domain protein | 1 | ||||
| Type IIG restriction enzyme/methyltransferase | 1 | 1 | |||
| Putative Type IIG restriction enzyme/methyltransferase | 43 | 49 | 12 | 12 | 11 |
| Putative Type III restriction enzyme | 2 | ||||
| Type III methyltransferase | 1 | ||||
| Putative Type III methyltransferase | 1 | ||||
| Putative Type IV methyl-directed restriction enzyme | 32 | 33 | 26 | 26 | 23 |
*
Restriction modification type classifications from the REBASE protein database, October 2016 (Roberts et al., 2015) including biochemically characterized proteins and predicted proteins (putative).