Wright L L, Palmer A G, Thompson N L
Department of Physics, University of North Carolina, Chapel Hill 27599.
Biophys J. 1988 Sep;54(3):463-70. doi: 10.1016/S0006-3495(88)82979-5.
The translational mobility of fluorescent-labeled monoclonal antibodies specifically bound to supported phospholipid bilayers containing hapten-conjugated phospholipids has been measured as a function of the surface concentration of bound antibodies using fluorescence recovery after photobleaching. Fluorescence recovery curves are fit well by a model that assumes the presence of two populations of antibodies with different lateral diffusion coefficients. The larger diffusion coefficient equals 3.5 x 10(-9) cm2/s, the smaller diffusion coefficient ranges from 1.5 x 10(-9) cm2/s to 2.5 x 10(-10) cm2/s, and the fractional fluorescence recovery associated with the smaller coefficient increases from approximately 0 to approximately 0.7 with increasing concentration of bound antibody. These results suggest that complexes of haptenated phospholipids and antibodies in phospholipid Langmuir-Blodgett films form clusters or domains in a concentration-dependent fashion.
利用光漂白后的荧光恢复技术,测量了特异性结合含有半抗原共轭磷脂的支持磷脂双层的荧光标记单克隆抗体的平移流动性,该流动性是结合抗体表面浓度的函数。荧光恢复曲线能很好地拟合一个模型,该模型假定存在具有不同横向扩散系数的两种抗体群体。较大的扩散系数等于3.5×10⁻⁹ cm²/s,较小的扩散系数范围为1.5×10⁻⁹ cm²/s至2.5×10⁻¹⁰ cm²/s,并且随着结合抗体浓度的增加,与较小系数相关的荧光恢复分数从约0增加到约0.7。这些结果表明,磷脂朗缪尔-布洛杰特膜中半抗原化磷脂和抗体的复合物以浓度依赖的方式形成簇或结构域。