Table 2.

Expression of proteolytic system gene promoter-lux fusions in CDM supplemented with dipeptides LP and PL at 1 mM

PromoterCDM (lux/OD unit [103]; mean ± SD)CDM + LP (lux/OD unit [103]; mean ± SD)Strength of repression by LPaCDM + PL (lux/OD unit [103]; mean ± SD)Strength of repression by PLb
PprtP3c 8,540 ± 953,800 ± 10024,300 ± 3002
PoppA 5,040 ± 300760 ± 306.5635 ± 18
PoppD 2,820 ± 160750 ± 504620 ± 654.5
PpepN 2,020 ± 140830 ± 502.5900 ± 702
PpepC 1,180 ± 130630 ± 202790 ± 101.5
PpepX 320 ± 30NDd ND305 ± 201
PpepQ 215 ± 4ND ND210 ± 101
  • a Ratio between the values obtained in CDM and CDM + LP.

  • b Ratio between the values obtained in CDM and CDM + PL.

  • c PprtP3-lux fusion is carried on a high-copy-number plasmid.

  • d ND, not determined.