The host perinuclear region is the host cytoplasmic region just around the host nucleus. Note: This location is defined for viral proteins that appear in the perinuclear region of infected host cells
[Replicase polyprotein 1ab]: Contains the activities necessary for the transcription of negative stranded RNA, leader RNA, subgenomic mRNAs and progeny virion RNA as well as proteinases responsible for the cleavage of the polyprotein into functional products. {By
SimilarityUniProtKB:Q04561}. [Nsp1-alpha papain-like cysteine proteinase]: Inhibits host IFN-beta production. Plays a role in the degradation of the host transcriptional activator CREBBP protein. The degradation of host CREBBP which is a key component of the IFN enhanceosome is likely responsible for the inhibition of interferon mediated by Nsp1-alpha. Participates also in the inhibition of host NF-kappa-B activation by counteracting LUBAC-dependent induction of NF-kappa-B. Reduces host NEMO ubiquitination by blocking the interaction between the two LUBAC complex components RNF31 and SHARPIN. {By
SimilarityUniProtKB:Q04561, Experimental EvidencePubMed:20006994, Experimental EvidencePubMed:20850164, Experimental EvidencePubMed:21438756}. [Nsp1-beta papain-like cysteine proteinase]: Plays a role in blocking host mRNA nuclear export to the cytoplasm and subversion of host protein synthesis. Additionally, inhibits the interferon-activated JAK/STAT signal transduction by mediating the ubiquitination and subsequent proteasomal degradation of host KPNA1. {By
SimilarityUniProtKB:Q04561, Experimental EvidencePubMed:20006994, Experimental EvidencePubMed:23449802}. [Nsp2 cysteine proteinase]: Multifunctional protein that acts as a viral protease and as a viral antagonist of host immune response. Cleaves the nsp2/nsp3 site in the viral polyprotein. Displays deubiquitinating activity that cleaves both ubiquitinated and ISGylated products and therefore inhibits ubiquitin and ISG15-dependent host innate immunity. Deubiquitinates also host NFKBIA, thereby interfering with NFKBIA degradation and impairing subsequent NF-kappa-B activation. {By
SimilarityUniProtKB:A0MD28, ECO:0000269|PubMed:18078692}. [Non-structural protein 3]: Plays a role in the inhibition of the immune response by interacting with host IFITM1. This interaction leads to the proteasomal degradation of the IFN-induced antiviral protein IFITM1. {By
SimilarityUniProtKB:Q04561}. [Serine protease nsp4]: Cleaves the majority of cleavage sites present in the C-terminus of the polyprotein. Triggers host apoptosis through caspase-3, -8, and -9 activations. Subverts host innate immune responses through its protease activity. Targets the NF- kappa-B essential modulator NEMO and mediates its cleavage. Blocks host interferon beta induction and downstream signaling by cleaving mitochondrial MAVS, dislodging it from the mitochondria. Impairs host defense by cleaving host mRNA-decapping enzyme DCP1A to attenuate its antiviral activity. {By
SimilarityUniProtKB:Q04561}. [Non-structural protein 5-6-7]: Plays a role in the initial induction of autophagosomes from host reticulum endoplasmic. {By
SimilarityUniProtKB:Q04561}. [Non-structural protein 5]: Plays a role in the inhibition of host STAT3 signaling pathway by inducing the degradation of STAT3. {By
SimilarityUniProtKB:Q04561}. [RNA-directed RNA polymerase]: Responsible for replication and transcription of the viral RNA genome. {By
SimilarityUniProtKB:Q04561}. [Helicase nsp10]: Displays RNA and DNA duplex-unwinding activities with 5' to 3' polarity. {By
SimilarityUniProtKB:Q04561}. [Uridylate-specific endoribonuclease nsp11]: Plays a role in viral transcription/replication and prevents the simultaneous activation of host cell dsRNA sensors, such as MDA5/IFIH1, OAS, and PKR (By similarity). Acts by degrading the 5'-polyuridines generated during replication of the poly(A) region of viral genomic and subgenomic RNAs. Catalyzes a two-step reaction in which a 2'3'-cyclic phosphate (2'3'- cP) is first generated by 2'-O transesterification, which is then hydrolyzed to a 3'-phosphate (3'-P) (By similarity). If not degraded, poly(U) RNA would hybridize with poly(A) RNA tails and activate host dsRNA sensors (By similarity). {ECO:0000250|UniProtKB:P0C6X7, ECO:0000250|UniProtKB:P19811}.
National and Kapodistrian University of Athens
Department of Biology
Biophysics & Bioinformatics Laboratory