Table 1.
Strains used in this study
| Strain | Description | Source |
|---|---|---|
| L. lactis | ||
| MG1363 | Derivative of natural isolate ML3 cured of plasmids and prophages | 21 |
| VEL 1122 | recA derivative of MG1363, Tetr | 22 |
| CL56-5 | Eryr marker chromosomally integrated in MG1363 | P. Le Bourgeois |
| REX2 | Stable exonuclease-defective ISS1insertional MG1363 mutant (insertion “2” in Fig. 2) | This work |
| E. coli | ||
| AB1157 | thr-1 leu-6 proA2 his-4 thi-1 argE3 lacYI galK2 ara-14 xyl-5 mtl-1 tsx-33 supE44 rspL31 kdgK51 | A. J. Clark |
| JC5519 | As AB1157 but recB21recC22 | A. J. Clark |
| BW6175 | HfrPK3, PO137, argE86::Tn10 | 23 |
| V186 | Δ(thyA-argA)232 IN(rrnD-rrnE)1 | 24 |
| V182 | As V186 plus pDWS2 | 24 |
| TG1 | F′ traD36 lacIqΔ(lacZ)M15 proA+B+/supE Δ(hsdM-mcrB) (rK−mK−McrB−) thi Δ(lac-proAB) |