Inhibitor Binding Induces Active Site Stabilisation of the Hcv Ns3 Protein Serine Protease DomainBarbato, G., Cicero, D.O., Cordier, F., Narjes, F., Gerlach, B., Sambucini, S., Grzesiek, S., Matassa, V.G., Defrancesco, R., Bazzo, R.
(2000) Embo J. 19: 1195
- PubMed: 10716920
- DOI: 10.1093/emboj/19.6.1195
- PubMed Abstract:
- The Solution Structure of the N-Terminal Serine Protease Domain of the Hepatitis C Virus Ns3 Protein Provides New Insights Into its Activation and Catalytic Mechanism
Barbato, G.,Cicero, D.O.,Nardi, M.C.,Steinkuhler, C.,Cortese, R.,Defrancesco, R.,Bazzo, R.
(1999) J.Mol.Biol. 289: 371
- Structural Characterization of the Interactions of Optimized Product Inhibitors with the N-Terminal Proteinase Domain of the Hepatitis C Virus (Hcv) Ns3 Protein by NMR and Modelling Studies
Cicero, D.O.,Barbato, G.,Koch, U.,Ingallinella, P.,Bianchi, E.,Nardi, M.C.,Steinkuhler, C.,Cortese, R.,Matassa, V.,Defrancesco, R.,Pessi, A.,Bazzo, R.
(1999) J.Mol.Biol. 289: 385
- The Metal Binding Site of the Hepatitis C Virus Ns3 Protease
Urbani, A.,Bazzo, R.,Nardi, M.C.,Cicero, D.O.,Defrancesco, R.,Steinkuhler, C.,Barbato, G.
(1998) J.Biol.Chem. 273: 18760
Few structures of viral serine proteases, those encoded by the Sindbis and Semliki Forest viruses, hepatitis C virus (HCV) and cytomegalovirus, have been reported. In the life cycle of HCV a crucial role is played by a chymotrypsin-like serine protea ...
Few structures of viral serine proteases, those encoded by the Sindbis and Semliki Forest viruses, hepatitis C virus (HCV) and cytomegalovirus, have been reported. In the life cycle of HCV a crucial role is played by a chymotrypsin-like serine protease encoded at the N-terminus of the viral NS3 protein, the solution structure of which we present here complexed with a covalently bound reversible inhibitor. Unexpectedly, the residue in the P2 position of the inhibitor induces an effective stabilization of the catalytic His-Asp hydrogen bond, by shielding that region of the protease from the solvent. This interaction appears crucial in the activation of the enzyme catalytic machinery and represents an unprecedented observation for this family of enzymes. Our data suggest that natural substrates of this serine protease could contribute to the enzyme activation by a similar induced-fit mechanism. The high degree of similarity at the His-Asp catalytic site region between HCV NS3 and other viral serine proteases suggests that this behaviour could be a more general feature for this category of viral enzymes.
Department of Biochemistry, IRBM 'P.Angeletti', Via Pontina km 30. 600, 00040 Pomezia, Roma, Italy. Barbato@irbm.it