European Biophysics Journal

, Volume 40, Issue 6, pp 761–774 | Cite as

The DFPase from Loligo vulgaris in sugar surfactant-based bicontinuous microemulsions: structure, dynamics, and enzyme activity

  • Stefan Wellert
  • Brigtte Tiersch
  • Joachim Koetz
  • André Richardt
  • Alain Lapp
  • Olaf Holderer
  • Jürgen Gäb
  • Marc-Michael Blum
  • Christoph Schulreich
  • Ralf Stehle
  • Thomas Hellweg
Original Paper


The enzyme diisopropyl fluorophosphatase (DFPase) from the squid Loligo vulgaris is of great interest because of its ability to catalyze the hydrolysis of highly toxic organophosphates. In this work, the enzyme structure in solution (native state) was studied by use of different scattering methods. The results are compared with those from hydrodynamic model calculations based on the DFPase crystal structure. Bicontinuous microemulsions made of sugar surfactants are discussed as host systems for the DFPase. The microemulsion remains stable in the presence of the enzyme, which is shown by means of scattering experiments. Moreover, activity assays reveal that the DFPase still has high activity in this complex reaction medium. To complement the scattering experiments cryo-SEM was also employed to study the microemulsion structure.


Dynamic light scattering Neutron spin echo Microemulsion Enzyme catalysis SANS Protein structure 



J.G. and M.M.B. were supported by the German Ministry of Defense under contract E/UR3G/6G115/6A801. T.H., R.S., C.S. also were financed by the German Ministry of Defense (Contracts E/E590/9Z004/5F159 and E/E590/8Z002/4F170). The SANS experiments were supported by the European Union through the NMI3 program. We are grateful to the Laboratoire Léon Brillouin and the Jülich Center for Neutron Scattering at the FRM II for providing beamtime.


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Copyright information

© European Biophysical Societies' Association 2011

Authors and Affiliations

  • Stefan Wellert
    • 1
  • Brigtte Tiersch
    • 2
  • Joachim Koetz
    • 2
  • André Richardt
    • 3
  • Alain Lapp
    • 4
  • Olaf Holderer
    • 5
  • Jürgen Gäb
    • 6
    • 9
  • Marc-Michael Blum
    • 6
    • 10
  • Christoph Schulreich
    • 8
  • Ralf Stehle
    • 7
  • Thomas Hellweg
    • 8
  1. 1.TU Berlin, Institut für ChemieStranski-Laboratorium für Physikalische und Theoretische ChemieBerlinGermany
  2. 2.Institut für ChemieUniversität PotsdamPotsdamGermany
  3. 3.Wehrwissenschaftliches Institut für Schutztechnologien–ABC-SchutzHumboldtstraßeGermany
  4. 4.Laboratoire Léon BrillouinC.E.A.-C.E.N. SaclayGif-sur-Yvette CedexFrance
  5. 5.Jülich Center for Neutron Scattering, FRM II GarchingGarchingGermany
  6. 6.Blum-Scientific ServicesHamburgGermany
  7. 7.Soft Matter und Funktionale MaterialienHelmholtz-Zentrum Berlin für Materialien und EnergieBerlinGermany
  8. 8.Physikalische und Biophysikalische ChemieBielefeldGermany
  9. 9.Institute of Pharmaceutical ChemistryPhillipps University MarburgMarburgGermany
  10. 10.Bioscience DivisionLos Alamos National LaboratoryLos AlamosUSA

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