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[[Image:4in2.jpg|left|200px]]
{{STRUCTURE_4in2|  PDB=4in2  |  SCENE=  }}  
{{STRUCTURE_4in2|  PDB=4in2  |  SCENE=  }}  
===Structural Basis of Substrate Specificity and Protease Inhibition in Norwalk Virus===
===Structural Basis of Substrate Specificity and Protease Inhibition in Norwalk Virus===
{{ABSTRACT_PUBMED_23365454}}


{{ABSTRACT_PUBMED_23365454}}
==Function==
[[http://www.uniprot.org/uniprot/POLG_NVN68 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.<ref>PMID:569187</ref> <ref>PMID:11160659</ref>  NTPase presumably plays a role in replication. Despite having similarities with helicases, does not seem to display any helicase activity.<ref>PMID:569187</ref> <ref>PMID:11160659</ref>  Protein P22 may play a role in targeting replication complex to intracellular membranes.<ref>PMID:569187</ref> <ref>PMID:11160659</ref>  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.<ref>PMID:569187</ref> <ref>PMID:11160659</ref>  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).<ref>PMID:569187</ref> <ref>PMID:11160659</ref>  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).<ref>PMID:569187</ref> <ref>PMID:11160659</ref> 


==About this Structure==
==About this Structure==
[[4in2]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/Streptomyces_aureorectus Streptomyces aureorectus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4IN2 OCA].  
[[4in2]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/Streptomyces_aureorectus Streptomyces aureorectus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4IN2 OCA].  
==Reference==
<references group="xtra"/><references/>
[[Category: Calicivirin]]
[[Category: Calicivirin]]
[[Category: Streptomyces aureorectus]]
[[Category: Streptomyces aureorectus]]

Revision as of 21:38, 10 April 2013

Template:STRUCTURE 4in2

Structural Basis of Substrate Specificity and Protease Inhibition in Norwalk Virus

Template:ABSTRACT PUBMED 23365454

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]

About this Structure

4in2 is a 2 chain structure with sequence from Streptomyces aureorectus. Full crystallographic information is available from OCA.

Reference

  1. ↑ Burroughs JN, Brown F. Presence of a covalently linked protein on calicivirus RNA. J Gen Virol. 1978 Nov;41(2):443-6. PMID:569187
  2. ↑ 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
  3. ↑ Burroughs JN, Brown F. Presence of a covalently linked protein on calicivirus RNA. J Gen Virol. 1978 Nov;41(2):443-6. PMID:569187
  4. ↑ 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
  5. ↑ Burroughs JN, Brown F. Presence of a covalently linked protein on calicivirus RNA. J Gen Virol. 1978 Nov;41(2):443-6. PMID:569187
  6. ↑ 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
  7. ↑ Burroughs JN, Brown F. Presence of a covalently linked protein on calicivirus RNA. J Gen Virol. 1978 Nov;41(2):443-6. PMID:569187
  8. ↑ 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
  9. ↑ Burroughs JN, Brown F. Presence of a covalently linked protein on calicivirus RNA. J Gen Virol. 1978 Nov;41(2):443-6. PMID:569187
  10. ↑ 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
  11. ↑ Burroughs JN, Brown F. Presence of a covalently linked protein on calicivirus RNA. J Gen Virol. 1978 Nov;41(2):443-6. PMID:569187
  12. ↑ 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

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