6W01

The 1.9 A Crystal Structure of NSP15 Endoribonuclease from SARS CoV-2 in the Complex with a Citrate


ChainDomainClassArchitectureTopologyHomology
A, B
3.30.160.820 Alpha Beta 2-Layer Sandwich Double Stranded RNA Binding Domain Nsp15 N-terminal domain-like
A, B
3.40.50.11580 Alpha Beta 3-Layer(aba) Sandwich Rossmann fold nsp15 middle domain
A, B
3.30.160.820 Alpha Beta 2-Layer Sandwich Double Stranded RNA Binding Domain Nsp15 N-terminal domain-like
A, B
3.40.50.11580 Alpha Beta 3-Layer(aba) Sandwich Rossmann fold nsp15 middle domain

Protein Family Annotation Pfam Database Homepage

ChainsAccessionIdentifierDescriptionCommentsSource
A, B
PF19215Coronavirus replicase NSP15, uridylate-specific endoribonuclease (CoV_NSP15_C)Coronavirus replicase NSP15, uridylate-specific endoribonucleaseThis entry represents the C-terminal domain of coronavirus non-structural protein 15 (NSP15 or nsp15). NSP15 is encoded by ORF1a/1ab and proteolytically released from the pp1a/1ab polyprotein. This domain exhibits endoribonuclease activity designated ...This entry represents the C-terminal domain of coronavirus non-structural protein 15 (NSP15 or nsp15). NSP15 is encoded by ORF1a/1ab and proteolytically released from the pp1a/1ab polyprotein. This domain exhibits endoribonuclease activity designated EndoU, highly conserved in all known CoVs and is part of the replicase-transcriptase complex that plays important roles in virus replication and transcription [1, 2, 3]. NSP15 is a Uridylate-specific endoribonuclease that cleaves the 5'-polyuridines from negative-sense viral RNA, termed PUN RNA either upstream or downstream of uridylates, at GUU or GU to produce molecules with 2',3'-cyclic phosphate ends [2, 3]. PUN RNA is a CoV MDA5-dependent pathogen-associated molecular pattern (PAMP) [3].
Domain
A, B
PF19216Coronavirus replicase NSP15, middle domain (CoV_NSP15_M)Coronavirus replicase NSP15, middle domainThis entry represents the non-catalytic middle domain from coronavirus non-structural protein 15 (NSP15). NSP15 is encoded by ORF1a/1ab and proteolytically released from the pp1a/1ab polyprotein. This domain is formed by ten beta strands organised in ...This entry represents the non-catalytic middle domain from coronavirus non-structural protein 15 (NSP15). NSP15 is encoded by ORF1a/1ab and proteolytically released from the pp1a/1ab polyprotein. This domain is formed by ten beta strands organised into three beta hairpins [1, 2].
Domain
A, B
PF19219Coronavirus replicase NSP15, N-terminal oligomerisation (CoV_NSP15_N)Coronavirus replicase NSP15, N-terminal oligomerisationThis is the N-terminal domain of the coronavirus nonstructural protein 15 (NSP15), which is encoded by ORF1a/1ab and proteolytically released from the pp1a/1ab polyprotein. NSP15, is a nidoviral RNA uridylate-specific endoribonuclease (NendoU) carryi ...This is the N-terminal domain of the coronavirus nonstructural protein 15 (NSP15), which is encoded by ORF1a/1ab and proteolytically released from the pp1a/1ab polyprotein. NSP15, is a nidoviral RNA uridylate-specific endoribonuclease (NendoU) carrying C-terminal catalytic domain belonging to the EndoU family. The SARS-CoV-2 NendoU monomers assemble into a double-ring hexamer, generated by a dimer of trimers. The hexamer is stabilized by the interactions of N-terminal oligomerization domain.
Domain

Gene Product Annotation Gene Product Annotation

ChainsPolymerMolecular FunctionBiological ProcessCellular Component
A, B
Uridylate-specific endoribonuclease