Transcriptional activator, which is essential for taurine-dependent expression of the tpa-tauR-xsc operon. Acts by binding to direct repeats in the promoter region. Induced by taurine. Positively autoregulated. In vitro, taurine does not influence the binding of TauR to the tpa promoter. In the C-terminal section; belongs to the class-I pyridoxal-phosphate-dependent aminotransferase family.