title: Monofunctional carbocyanine dyes for bio- and bioorthogonal conjugation.
abstract: A facile synthetic route to prepare monofunctional carbocyanine dyes for biological application is developed. Three pentamethine carbocyanine dyes have been successfully modified with a variety of functional groups such as: carboxylic acids, azides, or alkynes. The new dyes are characterized by strong NIR fluorescence emission, high extinction coefficients and good quantum yields. The azide and alkyne dyes have potential utility as components in bioorthogonal labeling schemes via [2 + 3] dipolar cycloaddition "click" reactions. The application of one derivative, CyAM-5 alkyne, for bioorthogonal labeling is demonstrated. Fluorescence microscopy shows coupling of CyAM-5 alkyne to Chinese hamster ovary (CHO) cells preincubated with azide modified glycans.
authors.affiliation: Center for Molecular Imaging Research and Center for Systems Biology, Massachusetts General Hospital/Havard Medical School, Room 5404, Building 149, 13th Street, Charlestown, Massachusetts 02129, USA.
authors.forename: Fangwei
authors.initials: F
authors.lastname: Shao
authors.forename: Ralph
authors.initials: R
authors.lastname: Weissleder
authors.forename: Scott A
authors.initials: SA
authors.lastname: Hilderbrand
mesh_terms: D000042:Absorption; D000818:Animals; D016466:CHO Cells; D002232:Carbocyanines / Q000138:chemical synthesis* / Q000737:chemistry* / Q000378:metabolism; D002417:Cattle; D006224:Cricetinae; D003412:Cricetulus; D005453:Fluorescence; D005456:Fluorescent Dyes / Q000138:chemical synthesis* / Q000737:chemistry*; D013194:Staining and Labeling
chemical_list: D002232:Carbocyanines; D005456:Fluorescent Dyes