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2fyq

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Revision as of 00:31, 10 September 2015

Crystal Structure of the Norwalk Virus Protease

Structural highlights

2fyq is a 1 chain structure with sequence from Norwalk calicivirus. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Ligands:	,
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum

Function

[POLG_NVN68] Protein p48 may play a role in viral replication by interacting with host VAPA, a vesicle-associated membrane protein that plays a role in SNARE-mediated vesicle fusion. This interaction may target replication complex to intracellular membranes.^[1] ^[2] NTPase presumably plays a role in replication. Despite having similarities with helicases, does not seem to display any helicase activity.^[3] ^[4] Protein P22 may play a role in targeting replication complex to intracellular membranes.^[5] ^[6] Viral genome-linked protein is covalently linked to the 5'-end of the positive-strand, negative-strand genomic RNAs and subgenomic RNA. Acts as a genome-linked replication primer. May recruit ribosome to viral RNA thereby promoting viral proteins translation.^[7] ^[8] 3C-like protease processes the polyprotein: 3CLpro-RdRp is first released by autocleavage, then all other proteins are cleaved. May cleave host polyadenylate-binding protein thereby inhibiting cellular translation (By similarity).^[9] ^[10] RNA-directed RNA polymerase replicates genomic and antigenomic RNA by recognizing replications specific signals. Transcribes also a subgenomic mRNA by initiating RNA synthesis internally on antigenomic RNA. This sgRNA encodes for structural proteins. Catalyzes the covalent attachment VPg with viral RNAs (By similarity).^[11] ^[12]

Evolutionary Conservation

Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.

Publication Abstract from PubMed

Norwalk virus (NV), a member of the Caliciviridae family, is the major cause of acute, epidemic, viral gastroenteritis. The NV genome is a positive sense, single-stranded RNA that encodes three open reading frames (ORFs). The first ORF produces a polyprotein that is processed by the viral cysteine protease into six nonstructural proteins. We have determined the structure of the NV protease to 1.5 and 2.2 A from crystals grown in the absence or presence, respectively, of the protease inhibitor AEBSF [4-(2-aminoethyl)-benzenesulfonyl fluoride]. The protease, which crystallizes as a stable dimer, exhibits a two-domain structure similar to those of other viral cysteine proteases with a catalytic triad composed of His 30, Glu 54, and Cys 139. The native structure of the protease reveals strong hydrogen bond interactions between His 30 and Glu 54, in the favorable syn configuration, indicating a role of Glu 54 during proteolysis. Mutation of this residue to Ala abolished the protease activity, in a fluorogenic peptide substrate assay, further substantiating the role of Glu 54 during proteolysis. These observations contrast with the suggestion, from a previous study of another norovirus protease, that this residue may not have a prominent role in proteolysis (K. Nakamura, Y. Someya, T. Kumasaka, G. Ueno, M. Yamamoto, T. Sato, N. Takeda, T. Miyamura, and N. Tanaka, J. Virol. 79:13685-13693, 2005). In the structure from crystals grown in the presence of AEBSF, Glu 54 undergoes a conformational change leading to disruption of the hydrogen bond interactions with His 30. Since AEBSF was not apparent in the electron density map, it is possible that these conformational changes are due to subtle changes in pH caused by its addition during crystallization.

X-ray crystallographic structure of the Norwalk virus protease at 1.5-A resolution.,Zeitler CE, Estes MK, Venkataram Prasad BV J Virol. 2006 May;80(10):5050-8. PMID:16641296^[13]

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

References

↑ Burroughs JN, Brown F. Presence of a covalently linked protein on calicivirus RNA. J Gen Virol. 1978 Nov;41(2):443-6. PMID:569187
↑ Pfister T, Wimmer E. Polypeptide p41 of a Norwalk-like virus is a nucleic acid-independent nucleoside triphosphatase. J Virol. 2001 Feb;75(4):1611-9. PMID:11160659 doi:10.1128/JVI.75.4.1611-1619.2001
↑ Burroughs JN, Brown F. Presence of a covalently linked protein on calicivirus RNA. J Gen Virol. 1978 Nov;41(2):443-6. PMID:569187
↑ Pfister T, Wimmer E. Polypeptide p41 of a Norwalk-like virus is a nucleic acid-independent nucleoside triphosphatase. J Virol. 2001 Feb;75(4):1611-9. PMID:11160659 doi:10.1128/JVI.75.4.1611-1619.2001
↑ Burroughs JN, Brown F. Presence of a covalently linked protein on calicivirus RNA. J Gen Virol. 1978 Nov;41(2):443-6. PMID:569187
↑ Pfister T, Wimmer E. Polypeptide p41 of a Norwalk-like virus is a nucleic acid-independent nucleoside triphosphatase. J Virol. 2001 Feb;75(4):1611-9. PMID:11160659 doi:10.1128/JVI.75.4.1611-1619.2001
↑ Burroughs JN, Brown F. Presence of a covalently linked protein on calicivirus RNA. J Gen Virol. 1978 Nov;41(2):443-6. PMID:569187
↑ Pfister T, Wimmer E. Polypeptide p41 of a Norwalk-like virus is a nucleic acid-independent nucleoside triphosphatase. J Virol. 2001 Feb;75(4):1611-9. PMID:11160659 doi:10.1128/JVI.75.4.1611-1619.2001
↑ Burroughs JN, Brown F. Presence of a covalently linked protein on calicivirus RNA. J Gen Virol. 1978 Nov;41(2):443-6. PMID:569187
↑ Pfister T, Wimmer E. Polypeptide p41 of a Norwalk-like virus is a nucleic acid-independent nucleoside triphosphatase. J Virol. 2001 Feb;75(4):1611-9. PMID:11160659 doi:10.1128/JVI.75.4.1611-1619.2001
↑ Burroughs JN, Brown F. Presence of a covalently linked protein on calicivirus RNA. J Gen Virol. 1978 Nov;41(2):443-6. PMID:569187
↑ Pfister T, Wimmer E. Polypeptide p41 of a Norwalk-like virus is a nucleic acid-independent nucleoside triphosphatase. J Virol. 2001 Feb;75(4):1611-9. PMID:11160659 doi:10.1128/JVI.75.4.1611-1619.2001
↑ Zeitler CE, Estes MK, Venkataram Prasad BV. X-ray crystallographic structure of the Norwalk virus protease at 1.5-A resolution. J Virol. 2006 May;80(10):5050-8. PMID:16641296 doi:80/10/5050

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

Proteopedia Page Contributors and Editors (what is this?)

OCA

Retrieved from "http://52.214.119.220/wiki/index.php/2fyq"

@@ Line 2: / Line 2: @@
 <StructureSection load='2fyq' size='340' side='right' caption='[[2fyq]], [[Resolution|resolution]] 1.50&Aring;' scene=''>
 == Structural highlights ==
-<table><tr><td colspan='2'>[[2fyq]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/Norwalk_virus Norwalk virus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2FYQ OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=2FYQ FirstGlance]. <br>
+<table><tr><td colspan='2'>[[2fyq]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/Norwalk_calicivirus Norwalk calicivirus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2FYQ OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=2FYQ FirstGlance]. <br>
 </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=CL:CHLORIDE+ION'>CL</scene>, <scene name='pdbligand=PO4:PHOSPHATE+ION'>PO4</scene></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=2fyq FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2fyq OCA], [http://www.rcsb.org/pdb/explore.do?structureId=2fyq RCSB], [http://www.ebi.ac.uk/pdbsum/2fyq PDBsum]</span></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=2fyq FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2fyq OCA], [http://pdbe.org/2fyq PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=2fyq RCSB], [http://www.ebi.ac.uk/pdbsum/2fyq PDBsum]</span></td></tr>
 </table>
 == Function ==
@@ Line 26: / Line 26: @@
 From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
 </div>
+<div class="pdbe-citations 2fyq" style="background-color:#fffaf0;"></div>
 == References ==
 <references/>
 __TOC__
 </StructureSection>
-[[Category: Norwalk virus]]
+[[Category: Norwalk calicivirus]]
 [[Category: Estes, M K]]
 [[Category: Prasad, B V.Venkataram]]
@@ Line 36: / Line 37: @@
 [[Category: Calicivirus]]
 [[Category: Norovirus]]
+[[Category: Norwalk virus]]
 [[Category: Protease]]
 [[Category: Viral protein]]

2fyq

From Proteopedia

Revision as of 00:31, 10 September 2015

Crystal Structure of the Norwalk Virus Protease

Structural highlights

Function

Evolutionary Conservation

Publication Abstract from PubMed

References

Contents

Proteopedia Page Contributors and Editors (what is this?)

Views

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