Back to Search
Start Over
Masked Rhodamine Dyes of Five Principal Colors Revealed by Photolysis of a 2-Diazo-1-Indanone Caging Group: Synthesis, Photophysics, and Light Microscopy Applications
- Source :
- Chemistry-A European Journal
- Publication Year :
- 2014
- Publisher :
- Wiley, 2014.
-
Abstract
- Caged rhodamine dyes (Rhodamines NN) of five basic colors were synthesized and used as “hidden” markers in subdiffractional and conventional light microscopy. These masked fluorophores with a 2-diazo-1-indanone group can be irreversibly photoactivated, either by irradiation with UV- or violet light (one-photon process), or by exposure to intense red light (λ∼750 nm; two-photon mode). All dyes possess a very small 2-diazoketone caging group incorporated into the 2-diazo-1-indanone residue with a quaternary carbon atom (C-3) and a spiro-9H-xanthene fragment. Initially they are non-colored (pale yellow), non-fluorescent, and absorb at λ=330–350 nm (molar extinction coefficient (ε)≈104 M−1 cm−1) with a band edge that extends to about λ=440 nm. The absorption and emission bands of the uncaged derivatives are tunable over a wide range (λ=511–633 and 525–653 nm, respectively). The unmasked dyes are highly colored and fluorescent (ε= 3–8×104 M−1 cm−1 and fluorescence quantum yields (ϕ)=40–85 % in the unbound state and in methanol). By stepwise and orthogonal protection of carboxylic and sulfonic acid groups a highly water-soluble caged red-emitting dye with two sulfonic acid residues was prepared. Rhodamines NN were decorated with amino-reactive N-hydroxysuccinimidyl ester groups, applied in aqueous buffers, easily conjugated with proteins, and readily photoactivated (uncaged) with λ=375–420 nm light or intense red light (λ=775 nm). Protein conjugates with optimal degrees of labeling (3–6) were prepared and uncaged with λ=405 nm light in aqueous buffer solutions (ϕ=20–38 %). The photochemical cleavage of the masking group generates only molecular nitrogen. Some 10–40 % of the non-fluorescent (dark) byproducts are also formed. However, they have low absorbance and do not quench the fluorescence of the uncaged dyes. Photoactivation of the individual molecules of Rhodamines NN (e.g., due to reversible or irreversible transition to a “dark” non-emitting state or photobleaching) provides multicolor images with subdiffractional optical resolution. The applicability of these novel caged fluorophores in super-resolution optical microscopy is exemplified. Fil: Belov, Vladimir N.. Max Planck Institute for Biophysical Chemistry ; Alemania Fil: Mitronova, Gyuzel Yu.. Max Planck Institute for Biophysical Chemistry ; Alemania Fil: Bossi, Mariano Luis. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Química, Física de los Materiales, Medioambiente y Energía. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Química, Física de los Materiales, Medioambiente y Energía; Argentina Fil: Boyarskiy, Vadim P.. St. Petersburg State University; Rusia Fil: Hebisch, Elke. Max Planck Institute for Biophysical Chemistry ; Alemania Fil: Geisler, Claudia. Max Planck Institute for Biophysical Chemistry ; Alemania Fil: Kolmakov, Kirill. Max Planck Institute for Biophysical Chemistry ; Alemania Fil: Wurm, Christian A.. Max Planck Institute for Biophysical Chemistry ; Alemania Fil: Willig, Katrin I.. Max Planck Institute for Biophysical Chemistry ; Alemania Fil: Hell, Stefan W.. Max Planck Institute for Biophysical Chemistry ; Alemania
- Subjects :
- Ultraviolet Rays
Sulfonic acid
Conjugated system
Photochemistry
Fluorescence
Catalysis
Rhodamine
Absorbance
Rhodamines
chemistry.chemical_compound
Chlorocebus aethiops
Animals
Vero Cells
Cytoskeleton
Fluorescent Dyes
chemistry.chemical_classification
Aza Compounds
Photolysis
Otras Ciencias Químicas
Organic Chemistry
Photodissociation
Bioconjugation
Ciencias Químicas
Proteins
General Chemistry
Photobleaching
Spectrometry, Fluorescence
Microscopy, Fluorescence
chemistry
Indans
Sulfonic Acids
CIENCIAS NATURALES Y EXACTAS
Subjects
Details
- ISSN :
- 09476539
- Volume :
- 20
- Database :
- OpenAIRE
- Journal :
- Chemistry - A European Journal
- Accession number :
- edsair.doi.dedup.....80247de1ae1494f37bf6998f3f1fceef