TMPRSS2 and ADAM17 Cleave ACE2 Differentially and Only Proteolysis by TMPRSS2 Augments Entry Driven by the Severe Acute Respiratory Syndrome Coronavirus Spike Protein

被引:637
作者
Heurich, Adeline [1 ]
Hofmann-Winkler, Heike [1 ]
Gierer, Stefanie [1 ]
Liepold, Thomas [2 ]
Jahn, Olaf [2 ]
Poehlmann, Stefan [1 ]
机构
[1] German Primate Ctr, Infect Biol Unit, Gottingen, Germany
[2] Max Planck Inst Expt Med, Prote Grp, D-37075 Gottingen, Germany
关键词
ANGIOTENSIN-CONVERTING ENZYME; TRYPSIN-LIKE PROTEASE; SARS-CORONAVIRUS; FUNCTIONAL RECEPTOR; HUMAN AIRWAY; TISSUE DISTRIBUTION; ANGIOTENSIN-CONVERTING-ENZYME-2; ACE2; NEUTRALIZING ANTIBODIES; INFLUENZA-VIRUS; CELLULAR ENTRY;
D O I
10.1128/JVI.02202-13
中图分类号
Q93 [微生物学];
学科分类号
071005 ; 100705 ;
摘要
The type II transmembrane serine proteases TMPRSS2 and HAT can cleave and activate the spike protein (S) of the severe acute respiratory syndrome coronavirus (SARS-CoV) for membrane fusion. In addition, these proteases cleave the viral receptor, the carboxypeptidase angiotensin-converting enzyme 2 (ACE2), and it was proposed that ACE2 cleavage augments viral infectivity. However, no mechanistic insights into this process were obtained and the relevance of ACE2 cleavage for SARS-CoV S protein (SARS-S) activation has not been determined. Here, we show that arginine and lysine residues within ACE2 amino acids 697 to 716 are essential for cleavage by TMPRSS2 and HAT and that ACE2 processing is required for augmentation of SARS-S-driven entry by these proteases. In contrast, ACE2 cleavage was dispensable for activation of the viral S protein. Expression of TMPRSS2 increased cellular uptake of soluble SARS-S, suggesting that protease-dependent augmentation of viral entry might be due to increased uptake of virions into target cells. Finally, TMPRSS2 was found to compete with the metalloprotease ADAM17 for ACE2 processing, but only cleavage by TMPRSS2 resulted in augmented SARS-S-driven entry. Collectively, our results in conjunction with those of previous studies indicate that TMPRSS2 and potentially related proteases promote SARS-CoV entry by two separate mechanisms: ACE2 cleavage, which might promote viral uptake, and SARS-S cleavage, which activates the S protein for membrane fusion. These observations have interesting implications for the development of novel therapeutics. In addition, they should spur efforts to determine whether receptor cleavage promotes entry of other coronaviruses, which use peptidases as entry receptors.
引用
收藏
页码:1293 / 1307
页数:15
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