Department of Membrane Biochemistry, Max-Planck Institute of Biochemistry, Martinsried, Germany. gonzalez@bio.ifi.lmu.de|Department of Membrane Biochemistry, Max-Planck Institute of Biochemistry, Martinsried, Germany. gonzalez@bio.ifi.lmu.de|Department of Membrane Biochemistry, Max-Planck Institute of Biochemistry, Martinsried, Germany. gonzalez@bio.ifi.lmu.de|Department of Membrane Biochemistry, Max-Planck Institute of Biochemistry, Martinsried, Germany. gonzalez@bio.ifi.lmu.de|Department of Membrane Biochemistry, Max-Planck Institute of Biochemistry, Martinsried, Germany. gonzalez@bio.ifi.lmu.de|Department of Membrane Biochemistry, Max-Planck Institute of Biochemistry, Martinsried, Germany. gonzalez@bio.ifi.lmu.de|Department of Membrane Biochemistry, Max-Planck Institute of Biochemistry, Martinsried, Germany. gonzalez@bio.ifi.lmu.de