Figure 2.
Validation of vanillic acid-responsive promoter variants containing different numbers of VanO operator modules. Vectors encoding SEAP expression driven by a vanillic acid-responsive promoter harbouring monomeric (pMG262), dimeric (pMG252), trimeric (pMG263) or tetrameric (pMG264) operator modules were co-transfected with pMG250 (PSV40-VanA1-pA) into (A) CHO-K1, (B) HEK-293 and (C) BHK-21 cells and SEAP production was scored after cultivation for 48 h in the presence and absence 250 µM vanillic acid.