Thiol mono-reactive zwitterionic and pI balancing Cy3 dye (Z-Cy3 dye). This reagent can be used to attach Cy3 fluorophore to proteins and peptides containing cysteine residues, as well as to other thiolated molecules (such as thiol-containing oligonucleotides).
Highlights:
From the laboratories of Edward A. Dratz, PhD, and Paul A. Grieco, PhD, Montana State University.
See more by visiting the Grieco Group Labpage.
Part of The Investigator's Annexe program.
Product Type: | Small Molecule |
Name: | Z-Cy3 Maleimide |
Chemical Formula: | C48H64N6O9S |
Molecular Weight: | 901.1 |
Format: | Dark red powder |
Purity: | 95+% (NMR, HPLC) |
Solubility: | Good in water and polar organic solvents |
Spectral Information: | Excitation maximum: 548nmExtinction at max excitation: 128,000Emission maximum: 564nmFluorescence quantum yield: 0.12 |
Storage: | -20C. Protect from light. Dessicate. |
Shipped: | Cold packs |
Suggested amount: 4nmol/50ug protein. NOTE: Cystines should be reduced with TCEP (tris-carboxyethylphosphine) prior to the labeling.
Labeling is performed according to the standard protocol from GE Healthcare. For a protein extract containing 5 µg protein in 9 uL cell lysis buffer (30 mM Tris, 7 M Urea, 2 M Thiourea, 4% (w/v) CHAPS, 5 mM magnesium acetate, pH 8.0), add 1 uL 2 mM TCEP and mix vigorously. Spin down the sample in a microcentrifuge and incubate at 37 °C for 1 hour in the dark. Add 2 uL 2 mM Z-CyDye maleimide and mix vigorously. Spin down the sample in a microcentrifuge and incubate at 37 °C for 30 minutes in the dark. Stop the reaction by adding 12 uL sample buffer (Pharmalytes (2% final), DTT (130 mM final), 7 M Urea, 2 M Thiourea, 4% CHAPS). Mix vigorously by pipetting and spin down the sample in a microcentrifuge.
2D DIGE Examples
2D gel of total soluble protein from Sulfolobus solfataricus labeled with Z-CyDyes. Each dye was used to label the protein sample separately. Dye labeled protein samples were combined and run on the same gel. After separation, the gel was scanned with 100 ?m steps using the following laser excitation/band-pass filter combinations: 488/520 nm for Z-Cy2 (left), 532/580 nm for Z-Cy3 (middle), and 633/670 nm for Z-Cy5 (right). Images show the relatively crowded central region of the gel (pI 4?9 and 15?150 kDa), revealing well-defined spots with all three dyes.
Adapted from: Epstein MG, et al. Bioconjug Chem. 2013 Sep 18;24(9):1552-61.
Comparison of Total Spot Number
Total number of spots detected from a gel using Z-Cy2, ZCy3, and Z-Cy5 and from a matched gel using CyDye DIGE Fluor minimal Cy2, Cy3, and Cy5 purchased from GE Healthcare. The protein samples labeled and experimental protocols were the same for both gels and all dyes. Progenesis SameSpots software detects more spots when Z-CyDyes are used in comparison to CyDyes.
Adapted from: Epstein MG, et al. Bioconjug Chem. 2013 Sep 18;24(9):1552-61.
Looking for a different Z-Cy Dye? Check out our other Z-Cy Dyes!
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