The density-dependent changes of avidities between Siglec-8 and the glycan ligand of the α(2 → 6)-sialyl-6-sulfo-N-acetyllactosamine derivative (1) were investigated for the first time. The SAM surfaces with different glycan densities were constructed by changing the ratio of 1 and 3,3′-dithiodipropionic acid (DTPA) on the gold electrode of the quartz crystal microbalance (QCM). Next, we measured the apparent KD values of 1 with Siglec-8 on the SAM surfaces by the QCM to investigate the effect of the glycan density on the avidity of the Siglec-8 interaction. The results obtained in this study suggest that Siglec-8 has an optimal glycan density (~9.2 × 102 molecules μm−2) for preferred interactions.
- Risa Naka
- Simon Sau Yin Law
- Masashi Ohmae