Please use this identifier to cite or link to this item: https://doi.org/10.1016/j.bbamem.2013.10.009
DC FieldValue
dc.titleTemperature dependence of diffusion in model and live cell membranes characterized by imaging fluorescence correlation spectroscopy
dc.contributor.authorBag, N.
dc.contributor.authorYap, D.H.X.
dc.contributor.authorWohland, T.
dc.date.accessioned2014-10-27T08:41:32Z
dc.date.available2014-10-27T08:41:32Z
dc.date.issued2014-03
dc.identifier.citationBag, N., Yap, D.H.X., Wohland, T. (2014-03). Temperature dependence of diffusion in model and live cell membranes characterized by imaging fluorescence correlation spectroscopy. Biochimica et Biophysica Acta - Biomembranes 1838 (3) : 802-813. ScholarBank@NUS Repository. https://doi.org/10.1016/j.bbamem.2013.10.009
dc.identifier.issn00052736
dc.identifier.urihttp://scholarbank.nus.edu.sg/handle/10635/101836
dc.description.abstractThe organization of the plasma membrane is regulated by the dynamic equilibrium between the liquid ordered (Lo) and liquid disordered (Ld) phases. The abundance of the Lo phase is assumed to be a consequence of the interaction between cholesterol and the other lipids, which are otherwise in either the Ld or gel (So) phase. The characteristic lipid packing in these phases results in significant differences in their respective lateral dynamics. In this study, imaging total internal reflection fluorescence correlation spectroscopy (ITIR-FCS) is applied to monitor the diffusion within supported lipid bilayers (SLBs) as functions of temperature and composition. We show that the temperature dependence of membrane lateral diffusion, which is parameterized by the Arrhenius activation energy (EArr), can resolve the sub-resolution phase behavior of lipid mixtures. The FCS diffusion law, a novel membrane heterogeneity ruler implemented in ITIR-FCS, is applied to show that the domains in the S o-Ld phase are static and large while they are small and dynamic in the Lo-Ld phase. Diffusion measurements and the subsequent FCS diffusion law analyses at different temperatures show that the modulation in membrane dynamics at high temperature (313 K) is a cumulative effect of domain melting and rigidity relaxation. Finally, we extend these studies to the plasma membranes of commonly used neuroblastoma, HeLa and fibroblast cells. The temperature dependence of membrane dynamics for neuroblastoma cells is significantly different from that of HeLa or fibroblast cells as the different cell types exhibit a high level of compositional heterogeneity. © 2013 Elsevier B.V.
dc.description.urihttp://libproxy1.nus.edu.sg/login?url=http://dx.doi.org/10.1016/j.bbamem.2013.10.009
dc.sourceScopus
dc.subjectActivation energy
dc.subjectCamera-based FCS
dc.subjectFCS diffusion law
dc.subjectLipid phase
dc.subjectMembrane organization
dc.typeArticle
dc.contributor.departmentBIOLOGICAL SCIENCES
dc.description.doi10.1016/j.bbamem.2013.10.009
dc.description.sourcetitleBiochimica et Biophysica Acta - Biomembranes
dc.description.volume1838
dc.description.issue3
dc.description.page802-813
dc.description.codenBBBMB
dc.identifier.isiut000331661800009
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