This old version of Proteopedia is provided for student assignments while the new version is undergoing repairs. Content and edits done in this old version of Proteopedia after March 1, 2026 will eventually be lost when it is retired in about June of 2026.

Apply for new accounts at the new Proteopedia. Your logins will work in both the old and new versions.

4ijf

From Proteopedia

(Difference between revisions)

Jump to: navigation, search

Current revision

Crystal structure of the Zaire ebolavirus VP35 interferon inhibitory domain K222A/R225A/K248A/K251A mutant

Structural highlights

4ijf is a 1 chain structure with sequence from Ebola virus - Mayinga, Zaire, 1976. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Method:	X-ray diffraction, Resolution 2.506Å
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

VP35_EBOZM Acsts as a polymerase cofactor in the RNA polymerase transcription and replication complex. Prevents establishment of cellular antiviral state by blocking virus-induced phosphorylation and activation of interferon regulatory factor 3 (IRF3), a transcription factor critical for the induction of interferons alpha and beta. The mechanism by which this blockage occurs remains incompletely defined, a hypothesis suggests that VP35 dsRNA-binding activity prevents activation of IRF3 by sequestering dsRNA. Also inhibits the antiviral effect mediated by the interferon-induced, double-stranded RNA-activated protein kinase EIF2AK2/PKR.^[1] ^[2] ^[3] ^[4] ^[5]

Publication Abstract from PubMed

Viral protein 35 (VP35), encoded by filoviruses, are multifunctional dsRNA binding proteins that play important roles in viral replication, innate immune evasion and pathogenesis. The multifunctional nature of these proteins also presents opportunities to develop countermeasures that target distinct functional regions. However, functional validation and the establishment of therapeutic approaches toward such multifunctional proteins, particularly for non-enzymatic targets, are often challenging. Our previous work on filoviral VP35 proteins defined conserved basic residues located within its C-terminal dsRNA binding interferon (IFN) inhibitory domain (IID) as important for VP35 mediated IFN antagonism and viral polymerase co-factor functions. In the current study, we used a combination of structural and functional data to determine regions of Ebola virus (EBOV) VP35 (eVP35) to target for aptamer selection using SELEX. Select aptamers, representing two distinct classes, were further characterized based on their interaction properties to eVP35 IID. These results revealed that the aptamers bind to distinct regions of eVP35 IID with high affinity (10-50 nM) and specificity. These aptamers can compete with dsRNA for binding to eVP35 and disrupt the eVP35-nucleoprotein (NP) interaction. Consistent with the ability to antagonize eVP35-NP interaction, select aptamers can inhibit the function of the EBOV polymerase complex reconstituted by expression of select viral proteins. Taken together, our results support the identification of two aptamers that bind filoviral VP35 proteins with high affinity and specificity and the capacity to potentially target filoviral VP35 proteins as a therapeutic target.

Development of RNA aptamers targeting Ebola virus VP35.,Binning JM, Wang T, Luthra P, Shabman RS, Borek DM, Liu G, Xu W, Leung DW, Basler CF, Amarasinghe GK Biochemistry. 2013 Sep 26. PMID:24067086^[6]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

References

↑ Muhlberger E, Weik M, Volchkov VE, Klenk HD, Becker S. Comparison of the transcription and replication strategies of marburg virus and Ebola virus by using artificial replication systems. J Virol. 1999 Mar;73(3):2333-42. PMID:9971816
↑ Basler CF, Wang X, Muhlberger E, Volchkov V, Paragas J, Klenk HD, Garcia-Sastre A, Palese P. The Ebola virus VP35 protein functions as a type I IFN antagonist. Proc Natl Acad Sci U S A. 2000 Oct 24;97(22):12289-94. PMID:11027311 doi:10.1073/pnas.220398297
↑ Basler CF, Mikulasova A, Martinez-Sobrido L, Paragas J, Muhlberger E, Bray M, Klenk HD, Palese P, Garcia-Sastre A. The Ebola virus VP35 protein inhibits activation of interferon regulatory factor 3. J Virol. 2003 Jul;77(14):7945-56. PMID:12829834
↑ Enterlein S, Warfield KL, Swenson DL, Stein DA, Smith JL, Gamble CS, Kroeker AD, Iversen PL, Bavari S, Muhlberger E. VP35 knockdown inhibits Ebola virus amplification and protects against lethal infection in mice. Antimicrob Agents Chemother. 2006 Mar;50(3):984-93. PMID:16495261 doi:10.1128/AAC.50.3.984-993.2006
↑ Feng Z, Cerveny M, Yan Z, He B. The VP35 protein of Ebola virus inhibits the antiviral effect mediated by double-stranded RNA-dependent protein kinase PKR. J Virol. 2007 Jan;81(1):182-92. Epub 2006 Oct 25. PMID:17065211 doi:JVI.01006-06
↑ Binning JM, Wang T, Luthra P, Shabman RS, Borek DM, Liu G, Xu W, Leung DW, Basler CF, Amarasinghe GK. Development of RNA aptamers targeting Ebola virus VP35. Biochemistry. 2013 Sep 26. PMID:24067086 doi:http://dx.doi.org/10.1021/bi400704d

1 Structural highlights
2 Function
3 Publication Abstract from PubMed
4 References

Proteopedia Page Contributors and Editors (what is this?)

OCA

Retrieved from "http://52.214.119.220/wiki/index.php/4ijf"

@@ Line 4: / Line 4: @@
 == Structural highlights ==
 <table><tr><td colspan='2'>[[4ijf]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Ebola_virus_-_Mayinga,_Zaire,_1976 Ebola virus - Mayinga, Zaire, 1976]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4IJF OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4IJF FirstGlance]. <br>
-</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=4ijf FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4ijf OCA], [https://pdbe.org/4ijf PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4ijf RCSB], [https://www.ebi.ac.uk/pdbsum/4ijf PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4ijf ProSAT]</span></td></tr>
+</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.506&#8491;</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=4ijf FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4ijf OCA], [https://pdbe.org/4ijf PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4ijf RCSB], [https://www.ebi.ac.uk/pdbsum/4ijf PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4ijf ProSAT]</span></td></tr>
 </table>
 == Function ==

4ijf

From Proteopedia

Current revision

Crystal structure of the Zaire ebolavirus VP35 interferon inhibitory domain K222A/R225A/K248A/K251A mutant

Structural highlights

Function

Publication Abstract from PubMed

References

Contents

Proteopedia Page Contributors and Editors (what is this?)

Views

Personal tools

Navigation

Search

Toolbox