SARS-CoV-2 nucleocapsid phosphoprotein (N protein)

The SARS-CoV-2 nucleocapsid phosphoprotein (N protein) is an essential structural protein encoded by the SARS-CoV-2 genome. It binds and packages the approximately 30 kb viral RNA genome inside the viral particle and plays a crucial role in the assembly of the virion[1][5][6]. The protein has a modular architecture, consisting of an N-terminal RNA-binding domain, a C-terminal dimerization domain, and three disordered regions that contribute to its structural flexibility and regulatory functions[1][5][6]. The N protein undergoes extensive phosphorylation by host kinases, which modulates its interactions with both viral RNA and host cellular proteins such as 14-3-3[2]. Beyond RNA packaging, N protein modulates host cellular processes, including suppression of host stress granule formation by sequestering proteins like G3BP1, and interacts with numerous host cell factors to facilitate efficient viral replication[5]. N protein is highly immunogenic and abundantly produced during infection, making it a key target in diagnostic assays (e.g., antigen rapid tests and RT-PCRs)[4]. While there are no direct-acting drugs currently approved against the N protein, it is under investigation as a promising antiviral target due to its essential role in the viral life cycle and its multiple points of interaction with host and viral components[1][3][5].

Other names

SARS-CoV-2 N proteinNucleocapsid proteinN phosphoproteinNucleocapsidCoronavirus nucleocapsid proteinCoV-2 N protein

Inhibition of viral RNA packaging; Disruption of protein-RNA or protein-protein interactions necessary for virion formation