期刊
LANGMUIR
卷 26, 期 10, 页码 7117-7125出版社
AMER CHEMICAL SOC
DOI: 10.1021/la904151h
关键词
-
资金
- National Institute of Health Sciences of Japan
- Nano/Bio Interface Center of University of Pennsylvania through the National Science Foundation [NSEC DMR-0425780]
- Japan Parmacopeia International Program
Tripod-shaped molecules were designed for chemical modification of the surface of probes used for atomic force microscopy (AFM). These chemically functionalized tips were used for chemical force spectroscopy (CFS) measurements of the ligand protein receptor interaction in a biotin-NeutrAvidin model system. We demonstrate that by using this unique tripodal system, we can achieve significantly lower density of ligand on the A FM tip apex, which is optimal for true single molecule measurements. Furthermore, the molecular tripods form highly stable bonds to the A FM probes, leading to more robust and reproducible unbinding force data, thereby addressing one of the challenges in CFS studies. Histogram analysis of the hundreds of collected unbinding forces showed a specific distribution with it peak force maximum at similar to 165 pN, in good agreement with the previously reported data of single rupture events of biotin-avidin. We compared these molecular tripod tips with a molecular monopod. The results showed that the molecular tripods are more robust for repeated measurements. The distinct biotin-avidin force maximum was not observed in the control experiments. This indicated that the force distribution observed for molecular tripods corresponds to the specific rupture force between biotin and avidin. The improved robustness of molecular tripods for CFS will provide benefits in other ligand-receptor unbinding studies, including those of transmembrane receptor systems, which require high resolution, sensitivity, and reproducibility in force spectroscopy measurements.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据