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Broad-spectrum virucidal activity of bacterial secreted lipases against flaviviruses, SARS-CoV-2 and other enveloped viruses

By Xi Yu, Liming Zhang, Liangqin Tong, Nana Zhang, Han Wang, Yun Yang, Mingyu Shi, Xiaoping Xiao, Yibin Zhu, PENGHUA WANG, Qiang Ding, Linqi Zhang, Chengfeng Qin, Gong Cheng

Posted 22 May 2020
bioRxiv DOI: 10.1101/2020.05.22.109900

Viruses are the major aetiological agents of acute and chronic severe human diseases that place a tremendous burden on global public health and economy; however, for most viruses, effective prophylactics and therapeutics are lacking, in particular, broad-spectrum antiviral agents. Herein, we identified 2 secreted bacterial lipases from a Chromobacterium bacterium, named Chromobacterium antiviral effector-1 ( Cb AE-1) and Cb AE-2, with a broad-spectrum virucidal activity against dengue virus (DENV), Zika virus (ZIKV), severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), human immunodeficiency virus (HIV) and herpes simplex virus (HSV). The Cb AEs potently blocked viral infection in the extracellular milieu through their lipase activity. Mechanistic studies showed that this lipase activity directly disrupted the viral envelope structure, thus inactivating infectivity. A mutation of Cb AE-1 in its lipase motif fully abrogated the virucidal ability. Furthermore, Cb AE-2 presented low toxicity in vivo and in vitro , highlighting its potential as a broad-spectrum antiviral drug. ### Competing Interest Statement The authors have declared no competing interest.

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