Specific fluorescent detection of fibrillar α-synuclein using mono- and trimethine cyanine dyes

Volkova, K.D. and Kovalska, V.B. and Balanda, A.O. and Losytskyy, M.Yu and Golub, A.G. and Vermeij, R.J. and Subramaniam, V. and Tolmachev, O.I. and Yarmoluk, S.M. (2008) Specific fluorescent detection of fibrillar α-synuclein using mono- and trimethine cyanine dyes. Bioorganic & Medicinal Chemistry, 16 (3). pp. 1452-1459. ISSN 0968-0896

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Abstract:	With the aim of searching of novel amyloid-specific fluorescent probes the ability of series of mono- and trimethine cyanines based on benzothiazole, pyridine and quinoline heterocycle end groups to recognize fibrillar formations of α-synuclein (ASN) was studied. For the first time it was revealed that monomethine cyanines can specifically increase their fluorescence in aggregated ASN presence. Dialkylamino-substituted monomethine cyanine T-284 and meso-ethyl-substituted trimethine cyanine SH-516 demonstrated the higher emission intensity and selectivity to aggregated ASN than classic amyloid stain Thioflavin T, and could be proposed as novel efficient fluorescent probes for fibrillar ASN detection. Studies of structure–function dependences have shown that incorporation of amino- or diethylamino- substituents into the 6-position of the benzothiazole heterocycle yields in a appearance of a selective fluorescent response to fibrillar α-synuclein presence. Performed calculations of molecular dimensions of studied cyanine dyes gave us the possibility to presume, that dyes bind with their long axes parallel to the fibril axis via insertion into the neat rows (so called ‘channels’) running along fibril.
Item Type:	Article
Copyright:	© 2008 Elsevier
Faculty:	Science and Technology (TNW)
Research Group:	Nano-Biophysics (NBP)
Link to this item:	http://purl.utwente.nl/publications/78906
Official URL:	http://dx.doi.org/10.1016/j.bmc.2007.10.051
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