1R2M

Atomic resolution structure of the HFBII hydrophobin: a self-assembling amphiphile


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1 Å
  • R-Value Free: 0.153 
  • R-Value Work: 0.137 

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This is version 1.2 of the entry. See complete history

Literature

Atomic resolution structure of the HFBII hydrophobin, a self-assembling amphiphile.

Hakanpaa, J.Paananen, A.Askolin, S.Nakari-Setala, T.Parkkinen, T.Penttila, M.Linder, M.B.Rouvinen, J.

(2004) J.Biol.Chem. 279: 534-539

  • DOI: 10.1074/jbc.M309650200

  • PubMed Abstract: 
  • Hydrophobins are proteins specific to filamentous fungi. Hydrophobins have several important roles in fungal physiology, for example, adhesion, formation of protective surface coatings, and the reduction of the surface tension of water, which allows ...

    Hydrophobins are proteins specific to filamentous fungi. Hydrophobins have several important roles in fungal physiology, for example, adhesion, formation of protective surface coatings, and the reduction of the surface tension of water, which allows growth of aerial structures. Hydrophobins show remarkable biophysical properties, for example, they are the most powerful surface-active proteins known. To this point the molecular basis of the function of this group of proteins has been largely unknown. We have now determined the crystal structure of the hydrophobin HFBII from Trichoderma reesei at 1.0 A resolution. HFBII has a novel, compact single domain structure containing one alpha-helix and four antiparallel beta-strands that completely envelop two disulfide bridges. The protein surface is mainly hydrophilic, but two beta-hairpin loops contain several conserved aliphatic side chains that form a flat hydrophobic patch that makes the molecule amphiphilic. The amphiphilicity of the HFBII molecule is expected to be a source for surface activity, and we suggest that the behavior of this surfactant is greatly enhanced by the self-assembly that is favored by the combination of size and rigidity. This mechanism of function is supported by atomic force micrographs that show highly ordered arrays of HFBII at the air water interface. The data presented show that much of the current views on structure function relations in hydrophobins must be re-evaluated.


    Organizational Affiliation

    Department of Chemistry, University of Joensuu, PO Box 111, 80101 Joensuu, Finland.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Hydrophobin II
A, B
71Hypocrea jecorinaMutation(s): 0 
Gene Names: hfb2
Find proteins for P79073 (Hypocrea jecorina)
Go to UniProtKB:  P79073
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
MN
Query on MN

Download SDF File 
Download CCD File 
A
MANGANESE (II) ION
Mn
WAEMQWOKJMHJLA-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1 Å
  • R-Value Free: 0.153 
  • R-Value Work: 0.137 
  • Space Group: C 1 2 1
Unit Cell:
Length (Å)Angle (°)
a = 78.657α = 90.00
b = 46.310β = 112.16
c = 34.593γ = 90.00
Software Package:
Software NamePurpose
REFMACrefinement
SCALEPACKdata scaling
DENZOdata reduction
ACORNphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2004-01-13
    Type: Initial release
  • Version 1.1: 2008-04-29
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance