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In virology, a spike protein or peplomer protein is a protein that forms a large structure known as a spike or peplomer projecting from the surface of an enveloped virus. [ 2 ] [ 3 ] : 29–33 The proteins are usually glycoproteins that form dimers or trimers .
Vpr is a Human immunodeficiency virus gene and protein product. [1] [2] Vpr stands for "Viral Protein R".Vpr, a 96 amino acid 14-kDa protein, plays an important role in regulating nuclear import of the HIV-1 pre-integration complex, and is required for virus replication and enhanced gene expression from provirus in dividing or non-dividing cells such as T cells or macrophages. [3]
The term viral protein refers to both the products of the genome of a virus and any host proteins incorporated into the viral particle. Viral proteins are grouped according to their functions, and groups of viral proteins include structural proteins , nonstructural proteins , regulatory proteins , and accessory proteins. [ 1 ]
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VPg (viral protein genome-linked) is a protein that is covalently attached to the 5′ end of positive strand viral RNA and acts as a primer during RNA synthesis in a variety of virus families including Picornaviridae, Potyviridae, Astroviridae and Caliciviridae.
The envelope (E) protein is the smallest and least well-characterized of the four major structural proteins found in coronavirus virions. [2] [3] [4] It is an integral membrane protein less than 110 amino acid residues long; [2] in SARS-CoV-2, the causative agent of Covid-19, the E protein is 75 residues long. [5]
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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.