|
|
| Line 1: |
Line 1: |
| | | | |
| | ==Effector domain of NS1 from influenza A/PR/8/34 containing a W187A mutation== | | ==Effector domain of NS1 from influenza A/PR/8/34 containing a W187A mutation== |
| - | <StructureSection load='3rvc' size='340' side='right' caption='[[3rvc]], [[Resolution|resolution]] 1.80Å' scene=''> | + | <StructureSection load='3rvc' size='340' side='right'caption='[[3rvc]], [[Resolution|resolution]] 1.80Å' scene=''> |
| | == Structural highlights == | | == Structural highlights == |
| - | <table><tr><td colspan='2'>[[3rvc]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/I34a1 I34a1]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3RVC OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=3RVC FirstGlance]. <br> | + | <table><tr><td colspan='2'>[[3rvc]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/I34a1 I34a1]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3RVC OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=3RVC FirstGlance]. <br> |
| - | </td></tr><tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[3o9r|3o9r]], [[3o9q|3o9q]]</td></tr> | + | </td></tr><tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat"><div style='overflow: auto; max-height: 3em;'>[[3o9r|3o9r]], [[3o9q|3o9q]]</div></td></tr> |
| - | <tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">NS ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=211044 I34A1])</td></tr> | + | <tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">NS ([https://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=211044 I34A1])</td></tr> |
| - | <tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=3rvc FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3rvc OCA], [http://pdbe.org/3rvc PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=3rvc RCSB], [http://www.ebi.ac.uk/pdbsum/3rvc PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=3rvc ProSAT]</span></td></tr> | + | <tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=3rvc FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3rvc OCA], [https://pdbe.org/3rvc PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=3rvc RCSB], [https://www.ebi.ac.uk/pdbsum/3rvc PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=3rvc ProSAT]</span></td></tr> |
| | </table> | | </table> |
| | == Function == | | == Function == |
| - | [[http://www.uniprot.org/uniprot/NS1_I34A1 NS1_I34A1]] Inhibits post-transcriptional processing of cellular pre-mRNA, by binding and inhibiting two cellular proteins that are required for the 3'-end processing of cellular pre-mRNAs: the 30 kDa cleavage and polyadenylation specificity factor (CPSF4) and the poly(A)-binding protein 2 (PABPN1). This results in the accumulation of unprocessed 3' end pre-mRNAs which can't be exported from the nucleus. Cellular protein synthesis is thereby shut off very early after virus infection. Viral protein synthesis is not affected by the inhibition of the cellular 3' end processing machinery because the poly(A) tails of viral mRNAs are produced by the viral polymerase through a stuttering mechanism (By similarity). Prevents the establishment of the cellular antiviral state by inhibiting TRIM25-mediated DDX58 ubiquitination, which normally triggers the antiviral transduction signal that leads to the activation of type I IFN genes by transcription factors like IRF3 and IRF7. Prevents human EIF2AK2/PKR activation, either by binding double-strand RNA, or by interacting directly with EIF2AK2/PKR. This function may be important at the very beginning of the infection, when NS1 is mainly present in the cytoplasm. Also binds poly(A) and U6 snRNA. Suppresses the RNA silencing-based antiviral response in Drosophila cells (By similarity). | + | [[https://www.uniprot.org/uniprot/NS1_I34A1 NS1_I34A1]] Inhibits post-transcriptional processing of cellular pre-mRNA, by binding and inhibiting two cellular proteins that are required for the 3'-end processing of cellular pre-mRNAs: the 30 kDa cleavage and polyadenylation specificity factor (CPSF4) and the poly(A)-binding protein 2 (PABPN1). This results in the accumulation of unprocessed 3' end pre-mRNAs which can't be exported from the nucleus. Cellular protein synthesis is thereby shut off very early after virus infection. Viral protein synthesis is not affected by the inhibition of the cellular 3' end processing machinery because the poly(A) tails of viral mRNAs are produced by the viral polymerase through a stuttering mechanism (By similarity). Prevents the establishment of the cellular antiviral state by inhibiting TRIM25-mediated DDX58 ubiquitination, which normally triggers the antiviral transduction signal that leads to the activation of type I IFN genes by transcription factors like IRF3 and IRF7. Prevents human EIF2AK2/PKR activation, either by binding double-strand RNA, or by interacting directly with EIF2AK2/PKR. This function may be important at the very beginning of the infection, when NS1 is mainly present in the cytoplasm. Also binds poly(A) and U6 snRNA. Suppresses the RNA silencing-based antiviral response in Drosophila cells (By similarity). |
| | <div style="background-color:#fffaf0;"> | | <div style="background-color:#fffaf0;"> |
| | == Publication Abstract from PubMed == | | == Publication Abstract from PubMed == |
| Line 24: |
Line 24: |
| | </StructureSection> | | </StructureSection> |
| | [[Category: I34a1]] | | [[Category: I34a1]] |
| | + | [[Category: Large Structures]] |
| | [[Category: Kerry, P S]] | | [[Category: Kerry, P S]] |
| | [[Category: Long, E]] | | [[Category: Long, E]] |
| Structural highlights
Function
[NS1_I34A1] Inhibits post-transcriptional processing of cellular pre-mRNA, by binding and inhibiting two cellular proteins that are required for the 3'-end processing of cellular pre-mRNAs: the 30 kDa cleavage and polyadenylation specificity factor (CPSF4) and the poly(A)-binding protein 2 (PABPN1). This results in the accumulation of unprocessed 3' end pre-mRNAs which can't be exported from the nucleus. Cellular protein synthesis is thereby shut off very early after virus infection. Viral protein synthesis is not affected by the inhibition of the cellular 3' end processing machinery because the poly(A) tails of viral mRNAs are produced by the viral polymerase through a stuttering mechanism (By similarity). Prevents the establishment of the cellular antiviral state by inhibiting TRIM25-mediated DDX58 ubiquitination, which normally triggers the antiviral transduction signal that leads to the activation of type I IFN genes by transcription factors like IRF3 and IRF7. Prevents human EIF2AK2/PKR activation, either by binding double-strand RNA, or by interacting directly with EIF2AK2/PKR. This function may be important at the very beginning of the infection, when NS1 is mainly present in the cytoplasm. Also binds poly(A) and U6 snRNA. Suppresses the RNA silencing-based antiviral response in Drosophila cells (By similarity).
Publication Abstract from PubMed
The effector domain (ED) of the influenza virus virulence factor NS1 is capable of interaction with a variety of cellular and viral targets, although regulation of these events is poorly understood. Introduction of a W187A mutation into the ED abolishes dimer formation; however, strand-strand interactions between mutant NS1 ED monomers have been observed in two previous crystal forms. A new condition for crystallization of this protein [0.1 M Bis-Tris pH 6.0, 0.2 M NaCl, 22%(w/v) PEG 3350, 20 mM xylitol] was discovered using the hanging-drop vapour-diffusion method. Diffraction data extending to 1.8 A resolution were collected from a crystal grown in the presence of 40 mM thieno[2,3-b]pyridin-2-ylmethanol. It was observed that there is conservation of the strand-strand interface in crystals of this monomeric NS1 ED in three different space groups. This observation, coupled with conformational changes in the interface region, suggests a potential role for beta-sheet augmentation in NS1 function.
Conservation of a crystallographic interface suggests a role for beta-sheet augmentation in influenza virus NS1 multifunctionality.,Kerry PS, Long E, Taylor MA, Russell RJ Acta Crystallogr Sect F Struct Biol Cryst Commun. 2011 Aug 1;67(Pt, 8):858-61. Epub 2011 Jul 13. PMID:21821881[1]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
References
- ↑ Kerry PS, Long E, Taylor MA, Russell RJ. Conservation of a crystallographic interface suggests a role for beta-sheet augmentation in influenza virus NS1 multifunctionality. Acta Crystallogr Sect F Struct Biol Cryst Commun. 2011 Aug 1;67(Pt, 8):858-61. Epub 2011 Jul 13. PMID:21821881 doi:10.1107/S1744309111019312
|
