Insights into the catalytic mechanism of glutathione S-transferase: the lesson from Schistosoma haematobium.
Glutathione S-transferases (GSTs) are involved in detoxification of xenobiotic compounds and in the biosynthesis of important metabolites. All GSTs activate glutathione (GSH) to GS(-); in many GSTs, this is accomplished by a Tyr at H-bonding distance from the sulfur of GSH. The high-resolution structure of GST from Schistosoma haematobium revealed that the catalytic Tyr occupies two alternative positions, one external, involving a pi-cation interaction with the conserved Arg21, and the other inside the GSH binding site. The interaction with Arg21 lowers the pK(a) of the catalytic Tyr10, as required for catalysis. Examination of several other GST structures revealed the presence of an external pocket that may accommodate the catalytic Tyr, and suggested that the change in conformation and acidic properties of the catalytic Tyr may be shared by other GSTs. Arginine and two other residues of the external pocket constitute a conserved structural motif, clearly identified by sequence comparison.
Angelucci
Francesco
F
Istituto di Biologia e Patologia Molecolari del CNR, Department of Biochemical Sciences A. Rossi Fanelli, University of Rome La Sapienza, 00185 Rome, Italy.
Baiocco
Paola
P
Brunori
Maurizio
M
Gourlay
Louise
L
Morea
Veronica
V
Bellelli
Andrea
A
D000818:Animals; D001120:Arginine / Q000737:chemistry; D002384:Catalysis; D004789:Enzyme Activation; D005982:Glutathione Transferase / Q000737:chemistry*; D006860:Hydrogen Bonding; D011487:Protein Conformation; D012548:Schistosoma haematobium / Q000201:enzymology*; D014443:Tyrosine / Q000737:chemistry
D014443:Tyrosine; D001120:Arginine; D005982:Glutathione Transferase