| Primary Identifier | IPR044351 | Type | Domain |
| Short Name | RdRp_SARS-CoV-like |
| description | This entry contains the RNA-dependent RNA polymerase (RdRp) of Severe acute respiratory syndrome coronavirus (SARS-CoV), SARS-CoV-2 (also known as 2019 novel CoV (2019-nCoV) or COVID-19 virus), and similar proteins from betacoronaviruses in the sarbecovirus subgenera (B lineage).Coronaviruses (CoVs) utilize a multi-subunit replication/transcription machinery. A set of non-structural proteins (NSPs) generated as cleavage products of the ORF1a and ORF1ab viral polyproteins assemble to facilitate viral replication and transcription. A key component, the RNA-dependent RNA polymerase (RdRp, also known as NSP12), catalyses the synthesis of viral RNA and thus plays a central role in the replication and transcription cycle of CoV, possibly interacting with its co-factors, NSP7 and NSP8. RdRp is therefore considered a primary target for nucleotide analog antiviral inhibitors such as remdesivir. NSP12 contains a RdRp domain as well as a large N-terminal extension that adopts a nidovirus RdRp-associated nucleotidyltransferase (NiRAN) architecture. The RdRp domain displays a right hand with three functional subdomains, called fingers, palm, and thumb. All RpRps contain conserved polymerase motifs (A-G), located in the palm (A-E motifs) and finger (F-G) subdomains. All these motifs have been implicated in RdRp fidelity such as processes of correct incorporation and reorganization of nucleotides []. |
