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Typical structure of native SMTP adsorbed on the siloxide-rich SiO2 surface. The surface atoms are indicated as yellow (Si) and red (O) CPKs, and the peptide surface is shown as a ghost surface as in Figure 2. Secondary structure is shown as a cartoon, and residues strongly interacting with the surface (Pro1, Leu2, Leu5, Arg6, Arg9, and Gln11) are annotated and shown by licorice. Peptide ends are annotated as well, and the peptide dipole moment is indicated by the red arrow.
