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Tam, D.; Lorenzo-Leal, A.C.; Hernández, L.R.; Bach, H. NSPs Present in the SARS-CoV-2 Genome. Encyclopedia. Available online: https://encyclopedia.pub/entry/48349 (accessed on 01 July 2024).
Tam D, Lorenzo-Leal AC, Hernández LR, Bach H. NSPs Present in the SARS-CoV-2 Genome. Encyclopedia. Available at: https://encyclopedia.pub/entry/48349. Accessed July 01, 2024.
Tam, Donald, Ana C. Lorenzo-Leal, Luis Ricardo Hernández, Horacio Bach. "NSPs Present in the SARS-CoV-2 Genome" Encyclopedia, https://encyclopedia.pub/entry/48349 (accessed July 01, 2024).
Tam, D., Lorenzo-Leal, A.C., Hernández, L.R., & Bach, H. (2023, August 23). NSPs Present in the SARS-CoV-2 Genome. In Encyclopedia. https://encyclopedia.pub/entry/48349
Tam, Donald, et al. "NSPs Present in the SARS-CoV-2 Genome." Encyclopedia. Web. 23 August, 2023.
NSPs Present in the SARS-CoV-2 Genome
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This entry is adapted from the peer-reviewed paper 10.3390/ijms241613002

Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) is an enveloped respiratory β coronavirus that causes coronavirus disease (COVID-19), leading to a deadly pandemic that has claimed millions of lives worldwide. Like other coronaviruses, the SARS-CoV-2 genome also codes for non-structural proteins (NSPs). These NSPs are found within open reading frame 1a (ORF1a) and open reading frame 1ab (ORF1ab) of the SARS-CoV-2 genome and encode NSP1 to NSP11 and NSP12 to NSP16, respectively. 

SARS-CoV-2 non-structural protein virulence factors

1. NSP1

NSP1 inhibits the translation of host proteins by binding to the mRNA binding pocket of the 40S ribosome via its C-terminal domain [1][2]. This prevents the synthesis of important proteins involved in the innate immune response, including IFN-b, IFN-g1, IL-8, and retinoic acid-inducible gene 1, which trigger apoptosis [3][4]. The N-terminal region of NSP1 upregulates the translation of viral mRNAs by binding to the 5′ UTR stem-loop 1 region [3][5]. NSP1 recruits exonucleases that cleave host mRNA and uncapped mRNA transcripts at their internal ribosome entry sites [6]. NSP1 has also been shown to block host mRNA transcripts from exiting the nucleus by binding to the NXF1-NXT1 heterodimer docking complex involved in the nuclear export of host mRNAs through the nuclear pore complex [7]. Altogether, this virulence factor incapacitates the ability of the host cell to mount an innate immune response while enhancing viral replication [3].

2. NSP2

Attempts to determine the function of NSP2 in the host were performed by in situ biotinylation [8]. However, although results showed that NSP2 interacted with the host proteins prohibitin 1 (PHB1) and prohibitin 2 (PHB2), a validation of the results using immunoblotting of the immunoprecipitated proteins with an anti-NSP2 antibody (not available) could not be proven. PHB 1 and 2 are involved in different cell activities, such as the morphology of mitochondria [9] and transcription factor regulation [10]. Interestingly, PHB1 has been reported as a receptor facilitating the entry of Chikungunya and Dengue 2 viruses [11][12].

3. NSP3

This papain-like protease (PLpro) protein cleaves the N-terminal region of pp1a to release NSP1 to NSP3 from the polyprotein [13]. It is also involved in the cleavage of proteinaceous post-translational modifications on host proteins involved in the innate antiviral responses, further dampening the immune response Field [13]. PLpro can also regulate the innate immune response by cleaving ubiquitin-like interferon-stimulated gene 15 (ISG15) from interferon response factor 3 (IRF3) to inhibit the IFN I pathway [13][14][15].

4. NSP4

NSP4 is a transmembrane protein that forms part of the viral replication complex within the virally infected cell [16]. It is involved in modifying the ER membranes to form DMV in conjunction with NSP6 to compartmentalize viral replication and viral assembly, acting as an additional barrier against intracellular antiviral responses [16].

5. NSP5

NSP5 is a 3-cysteine-like protease (3Clpro), the main viral protease of SARS-CoV-2 [17]. It cleaves at 11 specific sites after glutamine residues along pp1a and pp1ab to release NSP4 to NSP16 in their intermediate or mature forms [17][18].

6. NSP6

NSP6 is a transmembrane protein that interacts with NSP3 and NSP4 to induce the formation of endoplasmic reticulum (ER)-derived autophagosomes and DMVs [19]. These autophagosomes and DMVs serve as a site for replication transcription complexes (RTCs) to form, which are necessary for viral replication [16][19]. It is also involved in modulating ER stress by binding to the host sigma receptor that is involved in limiting the production of autophagosomes and autolysosomes to disrupt viral replication [20]. NSP6 has also been implicated in activating host autophagy pathways through the omegasome pathway to promote the assembly of viral replicase proteins and the degradation of immunomodulatory proteins [19]. NSP6 also directly inhibits the cleavage-mediated activation of vacuolar proton pump components such as ATP6AP1 to impair lysosomal acidification and trigger inflammasome-mediated pyroptosis [21].

7. NSP7

NSP7 is an accessory factor protein that forms a heterotetramer with NSP8 and NSP12 to assemble the RTC needed for RNA synthesis [22].

8. NSP8

NSP8 is another accessory factor protein that forms a homodimer with itself and forms a part of the larger RTC complex alongside NSP7 and NSP12, which is necessary for RNA synthesis [22]. It has also been shown to play a role in suppressing IFN-a signaling pathways to further progress disease pathogenesis [23].

9. NSP9

NSP9 is a single-stranded RNA-binding dimeric replicase protein that binds to and activates NSP8 as a cofactor [24]. NSP9 also plays a significant role in RNA synthesis by acting as a primer for NSP12 after being modified by the NiRAN domain of NSP12 by transferring a nucleotide monophosphate to the N-terminus of NSP9 [24][25]. In the host cell, NSP9 localizes around the ER membrane, which associates with the nucleoporin 62 (NUP62), a structural protein that forms part of the nuclear pore complex, to prevent the import of p65 into the nucleus [26]. This mislocalization of p65 leads to decreased NF-kb-regulated gene expression, resulting in a dampened immune response [26].

10. NSP10

NSP10 is a growth-factor-like protein with two zinc-binding motifs that allow it to act as a cofactor for NSP16 to aid in capping viral mRNA transcripts [27]. This capping of viral mRNA transcripts increases the rate of replication by the RTC and allows the transcript to evade the host RNases that cleave uncapped mRNA transcripts [28]. NSP10 also acts as a costimulatory factor to NSP14 to enhance its exonuclease activity to remove mismatched bases, and it also allosterically activates NSP14 to aid in mRNA capping [28][29].

11. NSP11

NSP11 is a short protein that shares identical homology to the first segment of NSP12 [30]. It is an intrinsically disordered protein that sits near the junction of pp1a and pp1b. It may be involved in host cytosolic membrane affinity interactions [30]. It is also suggested that NSP11 may play a role in ribosomal frameshifting to adjust the reading frame by −1 as the reading frame for the NSPs in pp1a and pp1ab are different [30]. NSP11 is also shown to regulate endoribonuclease activity and is necessary for viral replication [30].

12. NSP12

NSP12 is an RNA-dependent RNA polymerase (RdRP) protein that acts as the core of the RTC, which binds one NSP7 and two NSP8 molecules to stabilize the RNA binding region [31], allowing viral replication to proceed [32]. The primary RNA polymerase produces nascent ssRNA from the viral RNA template [33]. NSP12 also possesses an N-terminal nidovirus RdRP-associated nucleotidyltransferase (NiRAN) domain that transfers a GMP moiety to the 5′ pp-RNA to form a 5′ Gppp-RNA cap that NSP14 can methylate in the second step of mRNA capping [28].

13. NSP13

NSP13 is an ATP-dependent RdRP containing an ATP-binding helicase core domain and a zinc-binding domain involved in unwinding the RNA during replication and the transcription of complex RNAs with secondary and tertiary structures [34][35]. It also acts as an RTPase that removes the 5′ gamma phosphate from the mRNA to produce a 5′ pp-RNA in the first step of mRNA capping [36].

14. NSP14

NSP14 is a Zn-dependent exoribonuclease that proofreads and removes mismatched nucleotides in a 3′-5′ direction incorrectly added by the RNA polymerase during genome replication [28][29][37]. This exoribonuclease domain is stabilized by the zinc-finger domain of NSP10, which increases its ability to excise nucleotides [38]. NSP14 also possesses an N7-guanine methyltransferase domain that adds a methyl group to the N7 position of the 5′ Gppp-RNA intermediate in the presence of an S-adenosylmethionine methyl donor during the second step of mRNA capping [39].

15. NSP15

NSP15 is an Mn2+-dependent nidoviral RNA uridylate-specific endoribonuclease (NendoU) with 3 domains: an N-terminal oligomerization domain, a central domain, and a C-terminal catalytic domain [40][41]. The catalytic domain cleaves the nucleotides of single-stranded and double-stranded RNA molecules at the 3′ end of uridylates to produce 2′-3′ phosphodiester and 5′-hydroxyl termini [40][41]. NendoUs are highly conserved in coronaviruses, and they avoid immune detection by cleaving the poly-U sequences on their negative-sense viral RNA templates to avoid detection by MDA5 pattern recognition receptors [40][42]. They also act against the innate immune system by suppressing IFN-IFN-α/β-associated pathways that lead to the formation of certain cytoplasmic stress granules [43].

16. NSP16

NSP16 is a 2′-O-ribose methyltransferase that requires an S-adenosylmethionine (SAM) methyl donor that promotes the association of NSP16 to its cofactor, NSP10 [13][39][44]. This increases the affinity of the NSP16-NSP10 complex to mRNA transcripts and allows the complex to add a methyl group to the 2′-O-ribose of the 5′ cap in the final step of mRNA capping [45]. This allows the viral mRNA to evade being detected by host MDA5 and RIG-I receptors that recognize and degrade unprocessed mRNA transcripts.

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Subjects: Virology
Contributors MDPI registered users' name will be linked to their SciProfiles pages. To register with us, please refer to https://encyclopedia.pub/register :
Donald Tam
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Ana C. Lorenzo-Leal
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Luis Ricardo Hernández
,
Horacio Bach
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Entry Collection: COVID-19
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Update Date: 23 Aug 2023
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