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10.1021/acschembio.0c00875

http://scihub22266oqcxt.onion/10.1021/acschembio.0c00875
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33787221!ä!33787221

suck abstract from ncbi


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pmid33787221      ACS+Chem+Biol 2021 ; 16 (4): 642-650
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  • A Clinical-Stage Cysteine Protease Inhibitor blocks SARS-CoV-2 Infection of Human and Monkey Cells #MMPMID33787221
  • Mellott DM; Tseng CT; Drelich A; Fajtova P; Chenna BC; Kostomiris DH; Hsu J; Zhu J; Taylor ZW; Kocurek KI; Tat V; Katzfuss A; Li L; Giardini MA; Skinner D; Hirata K; Yoon MC; Beck S; Carlin AF; Clark AE; Beretta L; Maneval D; Hook V; Frueh F; Hurst BL; Wang H; Raushel FM; O'Donoghue AJ; de Siqueira-Neto JL; Meek TD; McKerrow JH
  • ACS Chem Biol 2021[Apr]; 16 (4): 642-650 PMID33787221show ga
  • Host-cell cysteine proteases play an essential role in the processing of the viral spike protein of SARS coronaviruses. K777, an irreversible, covalent inactivator of cysteine proteases that has recently completed phase 1 clinical trials, reduced SARS-CoV-2 viral infectivity in several host cells: Vero E6 (EC(50)< 74 nM), HeLa/ACE2 (4 nM), Caco-2 (EC(90) = 4.3 muM), and A549/ACE2 (<80 nM). Infectivity of Calu-3 cells depended on the cell line assayed. If Calu-3/2B4 was used, EC(50) was 7 nM, but in the ATCC Calu-3 cell line without ACE2 enrichment, EC(50) was >10 muM. There was no toxicity to any of the host cell lines at 10-100 muM K777 concentration. Kinetic analysis confirmed that K777 was a potent inhibitor of human cathepsin L, whereas no inhibition of the SARS-CoV-2 cysteine proteases (papain-like and 3CL-like protease) was observed. Treatment of Vero E6 cells with a propargyl derivative of K777 as an activity-based probe identified human cathepsin B and cathepsin L as the intracellular targets of this molecule in both infected and uninfected Vero E6 cells. However, cleavage of the SARS-CoV-2 spike protein was only carried out by cathepsin L. This cleavage was blocked by K777 and occurred in the S1 domain of the SARS-CoV-2 spike protein, a different site from that previously observed for the SARS-CoV-1 spike protein. These data support the hypothesis that the antiviral activity of K777 is mediated through inhibition of the activity of host cathepsin L and subsequent loss of cathepsin L-mediated viral spike protein processing.
  • |Animals[MESH]
  • |Antiviral Agents/*pharmacology[MESH]
  • |Cathepsin L/antagonists & inhibitors/metabolism[MESH]
  • |Cell Line, Tumor[MESH]
  • |Chlorocebus aethiops[MESH]
  • |Cysteine Proteinase Inhibitors/*pharmacology[MESH]
  • |Humans[MESH]
  • |Microbial Sensitivity Tests[MESH]
  • |Phenylalanine/*pharmacology[MESH]
  • |Piperazines/*pharmacology[MESH]
  • |Protein Domains[MESH]
  • |Proteolysis[MESH]
  • |SARS-CoV-2/*drug effects[MESH]
  • |Spike Glycoprotein, Coronavirus/chemistry/metabolism[MESH]
  • |Tosyl Compounds/*pharmacology[MESH]
  • |Vero Cells[MESH]


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