. "X-ray crystallography structure of the papain-like protease domain from SARS-CoV-2 non-structural protein 3. The catalytic residues are highlighted with cysteine in green and histidine in blue. The blue sphere is a bound zinc ion. From ."@en . . . . . "CoV_peptidase" . . . . . . . . . . . "PF08715"@en . . . . . . . . "IPR013016"@en . . "CoV_peptidase"@en . . . . . . . . "1066204194"^^ . "Nidoviral papain-like protease"@en . . . . "The nidoviral papain-like protease (PLPro or PLP) is a papain-like protease protein domain encoded in the genomes of nidoviruses. It is expressed as part of a large polyprotein from the ORF1a gene and has cysteine protease enzymatic activity responsible for proteolytic cleavage of some of the N-terminal viral nonstructural proteins within the polyprotein. A second protease also encoded by ORF1a, called the 3C-like protease or main protease, is responsible for the majority of further cleavages. Coronaviruses have one or two papain-like protease domains; in SARS-CoV and SARS-CoV-2, one PLPro domain is located in (nsp3). Arteriviruses have two to three PLP domains. In addition to their protease activity, PLP domains function as deubiquitinating enzymes (DUBs) that can cleave the isopeptide b"@en . "69492836"^^ . . . . . . . . . "12195"^^ . . . . . . . . . "Coronavirus papain-like peptidase"@en . . "The nidoviral papain-like protease (PLPro or PLP) is a papain-like protease protein domain encoded in the genomes of nidoviruses. It is expressed as part of a large polyprotein from the ORF1a gene and has cysteine protease enzymatic activity responsible for proteolytic cleavage of some of the N-terminal viral nonstructural proteins within the polyprotein. A second protease also encoded by ORF1a, called the 3C-like protease or main protease, is responsible for the majority of further cleavages. Coronaviruses have one or two papain-like protease domains; in SARS-CoV and SARS-CoV-2, one PLPro domain is located in (nsp3). Arteriviruses have two to three PLP domains. In addition to their protease activity, PLP domains function as deubiquitinating enzymes (DUBs) that can cleave the isopeptide bond found in ubiquitin chains. They are also \"deISGylating\" enzymes that remove the ubiquitin-like domain interferon-stimulated gene 15 (ISG15) from cellular proteins. These activities are likely responsible for antagonizing the activity of the host innate immune system. Because they are essential for viral replication, papain-like protease domains are considered drug targets for the development of antiviral drugs against human pathogens such as MERS-CoV, SARS-CoV, and SARS-CoV-2."@en . . . . . . . . . . . . . .