Represses the expression of the ttgGHI and ttgVW operons. Binds to the ttgGHI / ttgVW intergenic region, probably preventing binding of RNA polymerase; ttgV dissociates from this region in the presence of 1-hexanol. The ttgVW operon is induced by toluene and styrene, but not by the antibiotics carbenicillin, chloramphenicol, nalidixic acid, tetracycline or gentamicin.