Cyanine3 maleimide

Cat. # Quantity Price Lead time
11080 1 mg $110.00 in stock
21080 5 mg $210.00 in stock
41080 25 mg $410.00 in stock
51080 50 mg $695.00 in stock
61080 100 mg $1190.00 in stock

Thiol mono-reactive Cyanine3 dye. This reagent can be used to attach Cyanine3 fluorophore (an analog of Cy3®) to proteins and peptides containing cysteine residues, as well as to other thiolated molecules (such as thiol-containing oligonucleotides).

Cystines should be reduced with TCEP (tris-carboxyethylphosphine) or other appropriate reductant prior to the labeling.

Labeling with Cyanine3 maleimide is selective, and efficient.

We recommend using water-soluble Sulfo-Cyanine3 maleimide for the labeling of antibodies and other sensitive proteins.

Cy3 absorbance and emission spectra

Cy3 absorbance and emission spectra

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General properties

Appearance: red powder
Molecular weight: 615.20
Molecular formula: C36H43ClN4O3
Solubility: soluble in organic solvents (DMF, DMSO, dichloromethane), insoluble in water
Quality control: NMR 1H, HPLC-MS (95%)
Storage conditions: Storage: 24 months after receival at -20°C in the dark. Transportation: at room temperature for up to 3 weeks. Avoid prolonged exposure to light. Desiccate.
MSDS: Download

Spectral properties

Excitation maximum, nm: 555
ε, L⋅mol−1⋅cm−1: 150000
Emission maximum, nm: 570
Fluorescence quantum yield: 0.31
CF260: 0.04
CF280: 0.09

Product citations

  1. Wu, B.; Zhang, H.; Sun, R.; Peng, S.; Cooperman, B.S.; Goldman, Y.E.; Chen, C. Translocation kinetics and structural dynamics of ribosomes are modulated by the conformational plasticity of downstream pseudoknots. Nucleic Acids Research, 2018, 46(18), 9736–9748. doi: 10.1093/nar/gky636
  2. Liu, G.W.; Prossnitz, A.N.; Eng, D.G.; Cheng, Y.; Subrahmanyam, N.; Pippin, J.W.; Lamm, R.J.; Ngambenjawong, C.; Ghandehari, H.; Shankland, S.J.; Pun, S.H. Glomerular disease augments kidney accumulation of synthetic anionic polymers. Biomaterials, 2018, 178, 317–325. doi: 10.1016/j.biomaterials.2018.06.001
  3. Wojcik, F.; Dann, G.P.; Beh, L.Y.; Debelouchina, G.T.; Hofmann, R.; Muir, T.W. Functional crosstalk between histone H2B ubiquitylation and H2A modifications and variants. Nature Communications, 2018, 9, 1394. doi: 10.1038/s41467-018-03895-5
  4. Gadkari, V.V.; Harvey, S.R.; Raper, A.T.; Chu, W.-T.; Wang, J.; Wysocki, V.H.; Suo, Z. Investigation of sliding DNA clamp dynamics by single-molecule fluorescence, mass spectrometry and structure-based modeling. Nucleic Acids Research, 2018, 46(6), 3103–3118. doi: 10.1093/nar/gky125
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