Determining the specificity of monoclonal antibody HPT-101 to tau-peptides with optical tweezers.
Determining the specificity of monoclonal antibody HPT-101 to tau-peptides with optical tweezers.
复制标题
用光镊测定单克隆抗体 HPT-101 对 tau 肽的特异性
作者:
T. Stangner;C. Wagner;D. Singer;S. Angioletti-Uberti;C. Gutsche;J. Dzubiella;R. Hoffmann;F. Kremer
Optical tweezers-assisted dynamic force spectroscopy is employed to investigate specific receptor–ligand interactions on the level of single binding events. In particular, we analyze binding of the phosphorylation-specific monoclonal antibody (mAb) HPT-101 to synthetic tau-peptides with two potential phosphorylation sites (Thr231 and Ser235), being the most probable markers for Alzheimer’s disease. Whereas the typical interpretation of enzyme-linked immunosorbent assay (ELISA) suggests that this monoclonal antibody binds exclusively to the double-phosphorylated tau-peptide, we show here by DFS that the specificity of only mAb HPT-101 is apparent. In fact, binding occurs also to each sort of monophosphorylated peptide. Therefore, we characterize the unbinding process by analyzing the measured rupture force distributions, from which the lifetime of the bond without force τ0, its characteristic lengthxts, and the free energy of activation ΔGare extracted for the three mAb/peptide combinations. This information is used to build a simple theoretical model to predict features of the unbinding process for the double-phosphorylated peptide purely based on data on the monophosphorylated ones. Finally, we introduce a method to combine binding and unbinding measurements to estimate the relative affinity of the bonds. The values obtained for this quantity are in accordance with ELISA, showing how DFS can offer important insights about the dynamic binding process that are not accessible with this common and widespread assay.
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DOI:
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发表时间:
2001
期刊:
Journal of Alzheimer's Disease
影响因子:
--
作者:
F. Moreno;J. Valpuesta;Mar Pérez;J. Colchero;Arturo M. Barö;J. Ávila;E. Montejo de Garcíni
通讯作者:
E. Montejo de Garcíni
DOI:
10.1016/j.bbrc.2006.07.099
发表时间:
2006-09
影响因子:
3.1
作者:
Lian-Xiu Zhou;Z. Zeng;Jin‐Tang Du;Yu-Fen Zhao;Yan‐Mei Li
通讯作者:
Lian-Xiu Zhou;Z. Zeng;Jin‐Tang Du;Yu-Fen Zhao;Yan‐Mei Li
DOI:
--
发表时间:
2012
期刊:
影响因子:
--
作者:
Olaf Ueberschär;C. Wagner;Tim Stangner;C. Gutsche;F. Kremer
通讯作者:
F. Kremer
影响因子:
3.4
作者:
Evans, E;Ritchie, K
通讯作者:
Ritchie, K
影响因子:
3.1
作者:
D. Singer;J. Lehmann;Katja Hanisch;W. Härtig;R. Hoffmann
通讯作者:
R. Hoffmann