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Monitoring cholesterol organization in membranes at low concentrations utilizing the wavelength-selective fluorescence approach

机译:使用波长选择性荧光方法监测低浓度膜中胆固醇的组织

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We previously showed using a fluorescent analogue of cholesterol (NBD-cholesterol, or 25-[N-[(7-nitrobenz-2-oxa-1,3-diazol-4-yl)-methyl] amino]-27-norcholesterol), that cholesterol may exhibit local organization at low concentrations in membranes by the formation of transbilayer tail-to-tail dimers of cholesterol (Rukmini, R., Rawat, S.S., Biswas, S.C., Chattopadhyay, A., 2001. Biophys. J. 81, 2122-2134). In this report, we have monitored the microenvironmental features of cholesterol monomers and dimers utilizing wavelength-selective fluorescence spectroscopy. Our results utilizing red edge excitation shift (REES) and wavelength-dependent change in fluorescence anisotropy show that the microenvironment around the NBD moieties in the dimer form is more rigid possibly due to steric constraints imposed by the dimer conformation. These results provide new information and are relevant in understanding the organization of cholesterol in membranes at low concentrations. (c) 2004 Elsevier Ireland Ltd. All fights reserved.
机译:我们先前展示了使用胆固醇的荧光类似物(NBD-胆固醇,或25- [N-[(7-硝基苯-2-氧杂-1,3-二氮杂-4-基)-甲基]氨基] -27-降胆固醇,通过形成跨双层的胆固醇尾到尾二聚体,胆固醇可以在膜中以低浓度显示局部组织(Rukmini,R.,Rawat,SS,Biswas,SC,Chattopadhyay,A.,2001. Biophys。J. 81,2122-2134)。在本报告中,我们利用波长选择性荧光光谱法监测了胆固醇单体和二聚体的微环境特征。我们利用红边激发位移(REES)和荧光各向异性的波长依赖性变化的结果表明,二聚体形式的NBD部分周围的微环境更刚性,这可能是由于二聚体构象施加的空间限制。这些结果提供了新的信息,并且与了解低浓度膜中胆固醇的组织有关。 (c)2004爱思唯尔爱尔兰有限公司。保留所有战斗权。

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