This family of bacterial tannases close to hormone sensitive lipases, differs from the (Tannase) tannases and feruloyl esterase of fungi and bacteria grouped in the tannase family. The first structure described by Ren et al.Matoba et al. in this family presents a large cap domain inserted after the beta 7 strand of classical alpha/beta hydrolases. Tannases hydrolyze the galloyl ester bond in tannins to release gallic acid