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- NS5A abstract "Nonstructural protein 5A (NS5A) is a zinc-binding and proline-rich hydrophilic phosphoprotein that plays a key role in Hepatitis C virus RNA replication. It appears to be a dimeric form without trans-membrane helices.NS5A is derived from a large polyprotein that is translated from the HCV genome, and undergoes post translation processing by nonstructural protein 3 (NS3) viral protease. Despite no inherent enzymatic activity being attributed to NS5A, its function is mediated through interaction with other nonstructural (NS) viral and cellular proteins. NS5A has two phosphorylated forms: p56 and p58, which differ in the electrophoretic mobility. p56 is basally phosphorylated by host cellular protein kinase at the center and near the C terminus, whereas p58 is a form of hyperphorylated NS5A at the center of the serine-rich region. It has been predicted that the N-terminal 30 aa of NS5A form an amphipathic α-helix with a highly preserved feature, which is essential to modulate the association between NS5A and ER membrane. The IFN-sensitivity determining region (ISDR) at the C-terminal of NS5A has been reported to perform strong trans-activating activities, suggesting that NS5A likely functions as a transcriptional activator.NS5A has three structurally different domains: domain I was demonstrated to be an alternative dimeric structure by crystallography, while domain II and III remained unfolded. Furthermore, the conformational flexibility of NS5A plays an important role in multiple HCV infection stages. It is also possible that NS5A is a critical component during HCV replication and subcellular localization, which may shed light on the poorly understood HCV life cycle. Additionally, NS5A has been shown to modulate the polymerase activity of NS5B, an RNA-dependent RNA polymerase (RdRp). Intriguingly, NS5A may be a RNA binding protein because it is able to bind to the 3’UTR of the plus and minus HCV RNA strands. Moreover, NS5A is a key mediator in regulating host cell function and activity upon HCV infection. Therefore, NS5A has been extensively studied in HCV research also due to its capability to regulate the interferon (IFN) response of the host cells. Because NS5A exerts functionally essential effects in regulation of viral replication, assembly and egress, it has been considered a potential drug target for antiviral therapeutic intervention. Indeed, small molecule drugs efficiently targeting NS5A displayed a much higher potency in controlling HCV infection than other drugs. Therefore, NS5A related researches would have important implications in single molecule drug design and pegIFN-free direct-acting antiviral (DAA) combination therapies.".
- NS5A thumbnail HCV_genome.png?width=300.
- NS5A wikiPageID "20937565".
- NS5A wikiPageLength "5153".
- NS5A wikiPageOutDegree "19".
- NS5A wikiPageRevisionID "678207369".
- NS5A wikiPageWikiLink Activator_(genetics).
- NS5A wikiPageWikiLink Category:Hepatitis_C_virus.
- NS5A wikiPageWikiLink Category:Viral_nonstructural_proteins.
- NS5A wikiPageWikiLink Crystallography.
- NS5A wikiPageWikiLink Daclatasvir.
- NS5A wikiPageWikiLink ER_membrane.
- NS5A wikiPageWikiLink Endoplasmic_reticulum.
- NS5A wikiPageWikiLink Hepatitis_C.
- NS5A wikiPageWikiLink IFN.
- NS5A wikiPageWikiLink Interferon.
- NS5A wikiPageWikiLink Ledipasvir.
- NS5A wikiPageWikiLink NS3_(HCV).
- NS5A wikiPageWikiLink NS5B.
- NS5A wikiPageWikiLink Ombitasvir.
- NS5A wikiPageWikiLink Phosphoprotein.
- NS5A wikiPageWikiLink RDRP.
- NS5A wikiPageWikiLink RNA-binding_protein.
- NS5A wikiPageWikiLink RNA-dependent_RNA_polymerase.
- NS5A wikiPageWikiLink Three_prime_untranslated_region.
- NS5A wikiPageWikiLink Transcriptional_activator.
- NS5A wikiPageWikiLink Zinc-binding_protein.
- NS5A wikiPageWikiLink Zinc_finger.
- NS5A wikiPageWikiLink File:HCV_genome.png.
- NS5A wikiPageWikiLinkText "NS5A".
- NS5A hasPhotoCollection NS5A.
- NS5A wikiPageUsesTemplate Template:Reflist.
- NS5A wikiPageUsesTemplate Template:Viral_proteins.
- NS5A subject Category:Hepatitis_C_virus.
- NS5A subject Category:Viral_nonstructural_proteins.
- NS5A hypernym Phosphoprotein.
- NS5A type Protein.
- NS5A comment "Nonstructural protein 5A (NS5A) is a zinc-binding and proline-rich hydrophilic phosphoprotein that plays a key role in Hepatitis C virus RNA replication. It appears to be a dimeric form without trans-membrane helices.NS5A is derived from a large polyprotein that is translated from the HCV genome, and undergoes post translation processing by nonstructural protein 3 (NS3) viral protease.".
- NS5A label "NS5A".
- NS5A sameAs NS5_(VHC).
- NS5A sameAs Protéine_NS5A.
- NS5A sameAs m.05b0bg7.
- NS5A sameAs Q5675139.
- NS5A sameAs Q5675139.
- NS5A wasDerivedFrom NS5A?oldid=678207369.
- NS5A depiction HCV_genome.png.
- NS5A isPrimaryTopicOf NS5A.