betacoronavirus non-structural protein 2 (Nsp2) similar to SARS-CoV Nsp2, and related proteins from betacoronaviruses in the B lineage
Non-structural proteins (Nsps) from Severe acute respiratory syndrome coronavirus (SARS-CoV) and betacoronaviruses in the sarbecovirus subgenus (B lineage) are encoded in ORF1a and ORF1b. Post infection, the SARS-CoV genomic RNA is released into the cytoplasm of the cell and translated into two long polyproteins (pp), pp1a and pp1ab, which are then autoproteolytically cleaved by two viral proteases Nsp3 and Nsp5 into smaller subunits. Nsp2 is one of these subunits. The function of Nsp2 remains unknown. Deletion of Nsp2 from the SARS-CoV genome results in only a modest reduction in viral titers. Rather than playing a role in viral replication, SARS-CoV Nsp2 may be involved in altering the host cell environment; it has been shown to interact with two host proteins, prohibitin 1 (PHB1) and PHB2 which have been implicated in cellular functions, including cell-cycle progression, cell migration, cellular differentiation, apoptosis, and mitochondrial biogenesis.
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