1pbf
Crystal structures of wild-type p-hydroxybenzoate hydroxylase complexed with 4-aminobenzoate, 2,4-dihydroxybenzoate and 2-hydroxy-4-aminobenzoate and of the try222ala mutant, complexed with 2-hydroxy-4-aminobenzoate. evidence for a proton channel and a new binding mode of the flavin ring
