3LHC

Crystal structure of cyanovirin-n swapping domain b mutant


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.34 Å
  • R-Value Free: 0.221 
  • R-Value Work: 0.199 
  • R-Value Observed: 0.199 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Anti-HIV activity of defective cyanovirin-N mutants is restored by dimerization.

Matei, E.Zheng, A.Furey, W.Rose, J.Aiken, C.Gronenborn, A.M.

(2010) J Biol Chem 285: 13057-13065

  • DOI: 10.1074/jbc.M109.094938
  • Structures With Same Primary Citation

  • PubMed Abstract: 
  • Cyanovirin-N (CV-N) is a two-domain, cyanobacterial protein that inhibits human immunodeficiency virus (HIV) at nanomolar concentrations by binding to high mannose sugars on the HIV envelope glycoprotein gp120. The wild type protein can exist as a mo ...

    Cyanovirin-N (CV-N) is a two-domain, cyanobacterial protein that inhibits human immunodeficiency virus (HIV) at nanomolar concentrations by binding to high mannose sugars on the HIV envelope glycoprotein gp120. The wild type protein can exist as a monomer or a domain-swapped dimer with the monomer and dimer containing two or four sugar binding sites, respectively, one on each domain. Here we demonstrate that monomeric, single binding site mutants are completely inactive and that a single site, whether located on domain A or B, is insufficient to impart the antiviral activity. Linking inactive, monomeric proteins in a head-to-head fashion by an intermolecular disulfide bond or by creating an exclusively domain-swapped dimer via a hinge residue deletion restored antiviral activity to levels similar to that of wild type CV-N. These findings demonstrate unequivocally that multisite binding by CV-N type lectins is necessary for viral inhibition.


    Organizational Affiliation

    Department of Structural Biology, University of Pittsburgh Medical School, Pittsburgh, Pennsylvania 15260, USA.



Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Cyanovirin-NA100Nostoc ellipsosporumMutation(s): 5 
Find proteins for P81180 (Nostoc ellipsosporum)
Explore P81180 
Go to UniProtKB:  P81180
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
PO4
Query on PO4

Download CCD File 
A
PHOSPHATE ION
O4 P
NBIIXXVUZAFLBC-UHFFFAOYSA-K
 Ligand Interaction
NA
Query on NA

Download CCD File 
A
SODIUM ION
Na
FKNQFGJONOIPTF-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.34 Å
  • R-Value Free: 0.221 
  • R-Value Work: 0.199 
  • R-Value Observed: 0.199 
  • Space Group: P 32 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 47.14α = 90
b = 47.14β = 90
c = 78.39γ = 120
Software Package:
Software NamePurpose
PHASERphasing
CNSrefinement
d*TREKdata reduction
d*TREKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2010-02-09
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance