3HMG

REFINEMENT OF THE INFLUENZA VIRUS HEMAGGLUTININ BY SIMULATED ANNEALING


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.9 Å
  • R-Value Work: 0.238 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Refinement of the influenza virus hemagglutinin by simulated annealing.

Weis, W.I.Brunger, A.T.Skehel, J.J.Wiley, D.C.

(1990) J.Mol.Biol. 212: 737-761

  • DOI: 10.1016/0022-2836(90)90234-D
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • We have applied the method of simulated annealing to the refinement of the 3 A resolution crystal structure of the influenza virus hemagglutinin glycoprotein, using the program X-PLOR. Two different methods were introduced into X-PLOR to treat the no ...

    We have applied the method of simulated annealing to the refinement of the 3 A resolution crystal structure of the influenza virus hemagglutinin glycoprotein, using the program X-PLOR. Two different methods were introduced into X-PLOR to treat the non-crystallographic symmetry present in this and in other crystal structures. In the first, only the unique protomer atoms are refined; by application of the non-crystallographic symmetry operators to the protomer atoms, the X-ray structure factor derivatives are effectively averaged, and a non-bonded energy term models the interactions of the protomer with its neighbors in the oligomer without explicit refinement of the other protomers in the crystallographic asymmetric unit. In the second method, the entire asymmetric unit is refined, but an effective energy term is added to the empirical energy that restrains symmetry-related atomic positions to their average values after least-squares superposition. Several other modifications and additions were made to previously published X-PLOR protocols, including weighting of the X-ray terms, maintenance of the temperature of the molecular dynamics simulation, treatment of charged groups, changes in the values of certain empirical energy parameters, and the use of N-linked carbohydrate empirical energy parameters. The hemagglutinin refinement proceeded in several stages. An initial round of simulated annealing of the monomer was followed by rigid-body refinement of the 3-fold non-crystallographic symmetry axis position and a second round of monomer refinement. A third round was performed on the trimer using non-crystallographic symmetry restraints in all regions except those in lattice contacts showing obvious derivations from 3-fold symmetry. The refinement was completed with several rounds of conventional positional and isotropic temperature factor refinement needed to correct bad model geometry introduced by high-temperature molecular dynamics in regions of weak electron density. This structure was then used as the basis for refinement of three crystallographically isomorphous hemagglutinin structures, including complexes with the influenza virus receptor, sialic acid. Model geometry comparable to well-refined high-resolution structures was obtained with relatively little manual intervention, demonstrating the ability of simulated annealing refinement to produce highly idealized structures at moderate resolution.


    Related Citations: 
    • Structure of the Influenza Virus Haemagglutinin Complexes with its Receptor, Sialic Acid
      Weis, W.,Brown, J.H.,Cusack, S.,Paulson, J.C.,Skehel, J.J.,Wiley, D.C.
      (1988) Nature 333: 426
    • Three-Dimensional Structure of an Antigenic Mutant of the Influenza Virus Haemagglutinin
      Knossow, M.,Daniels, R.S.,Douglas, A.R.,Skehel, J.J.,Wiley, D.C.
      (1984) Nature 311: 678
    • Crystallization and X-Ray Diffraction Studies on the Haemagglutinin Glycoprotein from the Membrane of Influenza Virus
      Wiley, D.C.,Skehel, J.J.
      (1977) J.Mol.Biol. 112: 343
    • Structure of the Haemagglutinin Membrane Glycoprotein of Influenza Virus at 3 Angstroms Resolution
      Wilson, I.A.,Skehel, J.J.,Wiley, D.C.
      (1981) Nature 289: 366
    • Structural Identification of the Antibody-Binding Sites of Hong Kong Influenza Haemagglutinin and Their Involvement in Antigenic Variation
      Wiley, D.C.,Wilson, I.A.,Skehel, J.J.
      (1981) Nature 289: 373


    Organizational Affiliation

    Howard Hughes Medical Institute, Yale University, New Haven, CT 06511.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
HEMAGGLUTININ
A, C, E
328Influenza A virus (strain A/Aichi/2/1968 H3N2)Mutation(s): 0 
Gene Names: HA
Find proteins for P03437 (Influenza A virus (strain A/Aichi/2/1968 H3N2))
Go to UniProtKB:  P03437
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
HEMAGGLUTININ
B, D, F
175Influenza A virus (strain A/Aichi/2/1968 H3N2)Mutation(s): 0 
Gene Names: HA
Find proteins for P03437 (Influenza A virus (strain A/Aichi/2/1968 H3N2))
Go to UniProtKB:  P03437
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
BMA
Query on BMA

Download SDF File 
Download CCD File 
A, C, E
BETA-D-MANNOSE
C6 H12 O6
WQZGKKKJIJFFOK-RWOPYEJCSA-N
 Ligand Interaction
NAG
Query on NAG

Download SDF File 
Download CCD File 
A, B, C, D, E, F
N-ACETYL-D-GLUCOSAMINE
C8 H15 N O6
OVRNDRQMDRJTHS-FMDGEEDCSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.9 Å
  • R-Value Work: 0.238 
  • Space Group: P 41
Unit Cell:
Length (Å)Angle (°)
a = 162.800α = 90.00
b = 162.800β = 90.00
c = 177.300γ = 90.00
Software Package:
Software NamePurpose
X-PLORrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1991-01-15
    Type: Initial release
  • Version 1.1: 2008-03-25
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Source and taxonomy, Version format compliance