Biotechnology Center, Technische Universität Dresden, 01307 Dresden and Max Planck Institute of Biochemistry, Cellular and Molecular Biophysics, 82152 Martinsried, Germany.|Biotechnology Center, Technische Universität Dresden, 01307 Dresden and Max Planck Institute of Biochemistry, Cellular and Molecular Biophysics, 82152 Martinsried, Germany.|Biotechnology Center, Technische Universität Dresden, 01307 Dresden and Max Planck Institute of Biochemistry, Cellular and Molecular Biophysics, 82152 Martinsried, Germany.