Structural basis for the development of SARS 3CL protease inhibitors from a peptide mimic to an aza‐decaline scaffold
Identifieur interne : 000011 ( Istex/Checkpoint ); précédent : 000010; suivant : 000012Structural basis for the development of SARS 3CL protease inhibitors from a peptide mimic to an aza‐decaline scaffold
Auteurs : Kenta Teruya [Japon] ; Yasunao Hattori [Japon] ; Yasuhiro Shimamoto [Japon] ; Kazuya Kobayashi [Japon] ; Akira Sanjoh [Japon] ; Atsushi Nakagawa [Japon] ; Eiki Yamashita [Japon] ; Kenichi Akaji [Japon]Source :
- Peptide Science [ 0006-3525 ] ; 2016-07.
Abstract
Design of inhibitors against severe acute respiratory syndrome (SARS) chymotrypsin‐like protease (3CLpro) is a potentially important approach to fight against SARS. We have developed several synthetic inhibitors by structure‐based drug design. In this report, we reveal two crystal structures of SARS 3CLpro complexed with two new inhibitors based on our previous work. These structures combined with six crystal structures complexed with a series of related ligands reported by us are collectively analyzed. To these eight complexes, the structural basis for inhibitor binding was analyzed by the COMBINE method, which is a chemometrical analysis optimized for the protein–ligand complex. The analysis revealed that the first two latent variables gave a cumulative contribution ratio of r2 = 0.971. Interestingly, scores using the second latent variables for each complex were strongly correlated with root mean square deviations (RMSDs) of side‐chain heavy atoms of Met49 from those of the intact crystal structure of SARS‐3CLpro (r = 0.77) enlarging the S2 pocket. The substantial contribution of this side chain (∼10%) for the explanation of pIC50s was dependent on stereochemistry and the chemical structure of the ligand adapted to the S2 pocket of the protease. Thus, starting from a substrate mimic inhibitor, a design for a central scaffold for a low molecular weight inhibitor was evaluated to develop a further potent inhibitor. © 2015 Wiley Periodicals, Inc. Biopolymers (Pept Sci) 106: 391–403, 2016.
Url:
DOI: 10.1002/bip.22773
Affiliations:
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<front><div type="abstract">Design of inhibitors against severe acute respiratory syndrome (SARS) chymotrypsin‐like protease (3CLpro) is a potentially important approach to fight against SARS. We have developed several synthetic inhibitors by structure‐based drug design. In this report, we reveal two crystal structures of SARS 3CLpro complexed with two new inhibitors based on our previous work. These structures combined with six crystal structures complexed with a series of related ligands reported by us are collectively analyzed. To these eight complexes, the structural basis for inhibitor binding was analyzed by the COMBINE method, which is a chemometrical analysis optimized for the protein–ligand complex. The analysis revealed that the first two latent variables gave a cumulative contribution ratio of r2 = 0.971. Interestingly, scores using the second latent variables for each complex were strongly correlated with root mean square deviations (RMSDs) of side‐chain heavy atoms of Met49 from those of the intact crystal structure of SARS‐3CLpro (r = 0.77) enlarging the S2 pocket. The substantial contribution of this side chain (∼10%) for the explanation of pIC50s was dependent on stereochemistry and the chemical structure of the ligand adapted to the S2 pocket of the protease. Thus, starting from a substrate mimic inhibitor, a design for a central scaffold for a low molecular weight inhibitor was evaluated to develop a further potent inhibitor. © 2015 Wiley Periodicals, Inc. Biopolymers (Pept Sci) 106: 391–403, 2016.</div>
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