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Quenching of Triplet State Fluorophores for Studying Diffusion-Mediated Reactions in Lipid Membranes
Vise andre og tillknytning
2010 (engelsk)Inngår i: Biophysical Journal, ISSN 0006-3495, E-ISSN 1542-0086, Vol. 99, nr 11, s. 3821-3830Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

An approach to study bimolecular interactions in model lipid bilayers and biological membranes is introduced, exploiting the influence of membrane associated electron spin resonance labels on the triplet state kinetics of membrane bound fluorophores Singlet triplet state transitions within the dye Lissamine Rhodamine B (LRB) were studied when free in aqueous solutions, with LRB bound to a lipid in a liposome and in the presence of different local concentrations of the electron spin resonance label TEMPO By monitoring the triplet state kinetics via variations in the fluorescence signal, in this study using fluorescence correlation spectroscopy a strong fluorescence signal can be combined with the ability to monitor low frequency molecular interactions at timescales much longer than the fluorescence lifetimes Both in solution and in membranes the measured relative changes in the singlet triplet transitions rates were found to well reflect the expected collisional frequencies between the LRB and TEMPO molecules These collisional rates could also be monitored at local TEMPO concentrations where practically no quenching of the excited state of the fluorophores can be detected The proposed strategy is broadly applicable in terms of possible read out means types of molecular interactions that can be followed, and in what environments these interactions can be measured

sted, utgiver, år, opplag, sider
2010. Vol. 99, nr 11, s. 3821-3830
Emneord [en]
FLUORESCENCE CORRELATION SPECTROSCOPY; NITROXIDE RADICALS; LATERAL DIFFUSION; RHODAMINE DYES; CELL-SURFACE; KINETICS; PROBES; CHOLESTEROL; ENVIRONMENT; BILAYERS
HSV kategori
Forskningsprogram
biofysik
Identifikatorer
URN: urn:nbn:se:su:diva-51253DOI: 10.1016/j.bpj.2010.09.059ISI: 000285033800035OAI: oai:DiVA.org:su-51253DiVA, id: diva2:385220
Merknad
authorCount :6Tilgjengelig fra: 2011-01-11 Laget: 2011-01-10 Sist oppdatert: 2022-02-24bibliografisk kontrollert

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