Table 1 Bacterial strains and plasmids used in this study
| Â | Description | References |
|---|---|---|
Strains/plasmids | ||
 JOL1800 | ∆lon, ∆cpxR, ∆asd, wbaP mutant of S. Typhimurium | [18] |
 JOL1837 | JOL1800 with pMMP65 | [18] |
 JOL1913 | JOL1800 with pMMP65-4M2e | [18] |
 JOL2030 | JOL1800 with pMMP65-HA1 plasmid | This study |
 JOL2052 | JOl1800 with pMMP65-NA | This study |
Plasmids | ||
 pET28(+) | IPTG-inducible, T7 expression vector, C-terminal 6× His tag, KanR | Novagen, USA |
 pMMP65 | asd+, pBRori, lactamase signal sequence based periplasmic secretion plasmid, 6 His tag, high copy number plasmid | [38] |