Table 1 Characteristics of S. typhimurium strains and plasmids used in the study. Plasmids expressing Y-family DNA polymerase catalytical and accessory subunits incorporated in the Ames test strains used in present study are shown in the lower part

 TA1535

hisG46, gal, Δ (chl, uvrB, bio), rfa

[1]

 TA100

As TA1535, but harbors pKM101; Ap^r

[1]

 YG5151

As TA1535, but ΔumuDC_ST::Km^r, ΔsamAB::Cm^r

This study, [23]

 YG9056

As YG5151, but harbors pKM101; + Ap^r

This study

 YG9028

As YG5151, but harbors pYG8524 + pYG8517; + Ap^r + Tc^r

This study, [23]

 YG9029

As YG5151, but harbors pYG8529 + pYG8518; + Ap^r + Tc^r

This study

 YG9032

As YG5151, but harbors pYG8524 + pYG8518; + Ap^r + Tc^r

This study

 YG9033

As YG5151, but harbors pYG8529 + pYG8517; + Ap^r + Tc^r

This study

 pKM101

R46 derivative carrying the mucAB operon of Shigella sonnei

[7]

 pYG8524

pBR322 derivative expressing the activated MucA’ subunit of PolRI from the lac promoter

[19]

 pYG8529

pBR322 derivative expressing the activated SamA’ polymerase subunit from the lac promoter

[19]

 pYG8517

pSC101 derivative expressing the MucB catalytic subunit of PolRI from the lac promoter

[19]

 pYG8518

pSC101 derivative expressing the SamB polymerase subunit from the lac promoter

[19]