Figure 2

Solution CD spectra of GGYGG and other model peptides with and without a C-terminal tyrosine. Peptide solutions were prepared in a 10 mM sodium phosphate buffer (pH 7) at a peptide concentration of ca. 0.2 mM. All spectra were collected in a 1.0-mm path quartz cuvette held at 20°C. The dashed lines indicate the change in secondary structure when a C-terminal tyrosine was added to the sequence.