Inhibitors of cathepsin L prevent severe acute respiratory syndrome coronavirus entry.
Identifieur interne : 002606 ( PubMed/Corpus ); précédent : 002605; suivant : 002607Inhibitors of cathepsin L prevent severe acute respiratory syndrome coronavirus entry.
Auteurs : Graham Simmons ; Dhaval N. Gosalia ; Andrew J. Rennekamp ; Jacqueline D. Reeves ; Scott L. Diamond ; Paul BatesSource :
- Proceedings of the National Academy of Sciences of the United States of America [ 0027-8424 ] ; 2005.
English descriptors
- KwdEn :
- Cathepsin L, Cathepsins (antagonists & inhibitors), Cathepsins (metabolism), Cell Line, Cell Membrane (chemistry), Cell Membrane (drug effects), Cell Membrane (metabolism), Cysteine Endopeptidases (metabolism), Humans, Membrane Fusion (drug effects), Membrane Fusion (physiology), Molecular Structure, Protease Inhibitors (pharmacology), SARS Virus (drug effects), SARS Virus (physiology), Severe Acute Respiratory Syndrome (enzymology), Severe Acute Respiratory Syndrome (prevention & control), Severe Acute Respiratory Syndrome (virology), Temperature.
- MESH :
- chemical , antagonists & inhibitors : Cathepsins.
- chemical , metabolism : Cathepsins, Cysteine Endopeptidases.
- chemical , pharmacology : Protease Inhibitors.
- chemical : Cathepsin L.
- chemistry : Cell Membrane.
- drug effects : Cell Membrane, Membrane Fusion, SARS Virus.
- enzymology : Severe Acute Respiratory Syndrome.
- metabolism : Cell Membrane.
- physiology : Membrane Fusion, SARS Virus.
- prevention & control : Severe Acute Respiratory Syndrome.
- virology : Severe Acute Respiratory Syndrome.
- Cell Line, Humans, Molecular Structure, Temperature.
Abstract
Severe acute respiratory syndrome (SARS) is caused by an emergent coronavirus (SARS-CoV), for which there is currently no effective treatment. SARS-CoV mediates receptor binding and entry by its spike (S) glycoprotein, and infection is sensitive to lysosomotropic agents that perturb endosomal pH. We demonstrate here that the lysosomotropic-agent-mediated block to SARS-CoV infection is overcome by protease treatment of target-cell-associated virus. In addition, SARS-CoV infection was blocked by specific inhibitors of the pH-sensitive endosomal protease cathepsin L. A cell-free membrane-fusion system demonstrates that engagement of receptor followed by proteolysis is required for SARS-CoV membrane fusion and indicates that cathepsin L is sufficient to activate membrane fusion by SARS-CoV S. These results suggest that SARS-CoV infection results from a unique, three-step process: receptor binding and induced conformational changes in S glycoprotein followed by cathepsin L proteolysis within endosomes. The requirement for cathepsin L proteolysis identifies a previously uncharacterized class of inhibitor for SARS-CoV infection.
DOI: 10.1073/pnas.0505577102
PubMed: 16081529
Links to Exploration step
pubmed:16081529Le document en format XML
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<front><div type="abstract" xml:lang="en">Severe acute respiratory syndrome (SARS) is caused by an emergent coronavirus (SARS-CoV), for which there is currently no effective treatment. SARS-CoV mediates receptor binding and entry by its spike (S) glycoprotein, and infection is sensitive to lysosomotropic agents that perturb endosomal pH. We demonstrate here that the lysosomotropic-agent-mediated block to SARS-CoV infection is overcome by protease treatment of target-cell-associated virus. In addition, SARS-CoV infection was blocked by specific inhibitors of the pH-sensitive endosomal protease cathepsin L. A cell-free membrane-fusion system demonstrates that engagement of receptor followed by proteolysis is required for SARS-CoV membrane fusion and indicates that cathepsin L is sufficient to activate membrane fusion by SARS-CoV S. These results suggest that SARS-CoV infection results from a unique, three-step process: receptor binding and induced conformational changes in S glycoprotein followed by cathepsin L proteolysis within endosomes. The requirement for cathepsin L proteolysis identifies a previously uncharacterized class of inhibitor for SARS-CoV infection.</div>
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