Table 1.
Peptides | Carbon atoms in linker | Putative length (Å) | Binding at pH 5.5 (%)a | Binding at pH 7.3 (%)a |
---|---|---|---|---|
9 | 13 | 14.3 | 72.8 | 52.1 |
10 | 18 | 19.8 | 70.9 | 54.6 |
8 | 29 | 31.9 | 62.0 | 46.3 |
11 | 29 | 31.9 | 63.2 | 53.3 |
12 | 32 | 35.2 | 69.3 | 50.7 |
13 | 41 | 45.1 | 70.2 | 54.5 |
14 | 53 | 58.3 | 70.2 | 51.8 |
15 | 89 | 97.9 | 67.8 | 38.6 |
Measurements were made either at pH 5.5 or at pH 7.3. Recombinant DQ2 (4.7 μM) was mixed with fluorescein-conjugated peptide (0.185 μM) at 37°C for 5 h, and the amount of DQ2 bound peptide was calculated as the percentage (×100%) of total peptide. The results are presented as mean of the two experiments with errors <5% of the numerical values.