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Ronen Zangi, Marcel L. de Vocht, George T. Robillard, Alan E. Mark 

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Presentation on theme: "Ronen Zangi, Marcel L. de Vocht, George T. Robillard, Alan E. Mark "— Presentation transcript:

1 Molecular Dynamics Study of the Folding of Hydrophobin SC3 at a Hydrophilic/Hydrophobic Interface 
Ronen Zangi, Marcel L. de Vocht, George T. Robillard, Alan E. Mark  Biophysical Journal  Volume 83, Issue 1, Pages (July 2002) DOI: /S (02) Copyright © 2002 The Biophysical Society Terms and Conditions

2 Figure 1 Primary structure of truncated SC3 showing the four loops formed by the four disulfide bridges. Cysteine residues are yellow. Hydrophilic and hydrophobic residues are blue and red, respectively. Biophysical Journal  , DOI: ( /S (02) ) Copyright © 2002 The Biophysical Society Terms and Conditions

3 Figure 2 Radius of gyration (nanometers) of SC3 as a function of time at the water/hexane interface, in water and in hexane. The zero time indicates the point at which the disulfide bridges were formed. The values were calculated every 400ps and averaged over a window of five adjacent points. Biophysical Journal  , DOI: ( /S (02) ) Copyright © 2002 The Biophysical Society Terms and Conditions

4 Figure 3 Structures of SC3 from the simulation at the water/hexane after 0, 10, 50, and 135ns. The sulfur atoms in the cysteine residues are shown in yellow. Biophysical Journal  , DOI: ( /S (02) ) Copyright © 2002 The Biophysical Society Terms and Conditions

5 Figure 4 Structures of SC3 from the simulation in water after 0, 10, 50, and 100ns. The sulfur atoms in the cysteine residues are shown in yellow. Biophysical Journal  , DOI: ( /S (02) ) Copyright © 2002 The Biophysical Society Terms and Conditions

6 Figure 5 Structures of SC3 from the simulation in hexane after 0, 10, 50, and 100ns. The sulfur atoms in the cysteine residues are shown in yellow. Biophysical Journal  , DOI: ( /S (02) ) Copyright © 2002 The Biophysical Society Terms and Conditions

7 Figure 6 Secondary structure assignment of the protein (DSSP) as a function of time for the simulations in the three environments. Biophysical Journal  , DOI: ( /S (02) ) Copyright © 2002 The Biophysical Society Terms and Conditions

8 Figure 7 Structures of SC3 from the second simulation at the water/hexane interface after 25 and 51ns. In the lower panel the DSSP plot is drawn. Biophysical Journal  , DOI: ( /S (02) ) Copyright © 2002 The Biophysical Society Terms and Conditions

9 Figure 8 Hydrophobic moment of SC3, as defined in Eq. 1, as a function of time from the simulations at the interface and in the bulk solvents. The values were calculated every 400ps and averaged over a window of five adjacent points. Biophysical Journal  , DOI: ( /S (02) ) Copyright © 2002 The Biophysical Society Terms and Conditions

10 Figure 9 Migration of SC3 from the water phase to the interface. For clarity, only a 2.7-nm slice around the protein is shown. The oxygen atoms of the water molecules are colored red, whereas the atoms of hexane are colored gray. Biophysical Journal  , DOI: ( /S (02) ) Copyright © 2002 The Biophysical Society Terms and Conditions

11 Figure 10 Migration of SC3 from the hexane phase to the interface. For clarity, only a 2.7-nm slice around the protein is shown. The oxygen atoms of water are colored red, whereas the atoms of hexane are colored gray. Biophysical Journal  , DOI: ( /S (02) ) Copyright © 2002 The Biophysical Society Terms and Conditions


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