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GDP-Cy5-Fucose Summary


Key Benefits

Learn more about Fluorescent Glycan Labeling and Detection

GDP-Cy5-Fucose for fucose detection



Molecular Weight


>1416.3 Da


Lyophilized with Tris, pH 8.0

Stability & Storage

Store the unopened product at < -20 °C. Good for 12 months from date of receipt.




  • Fluorescent labeling with Cy5 of free glycans as well as glycoproteins and glycolipids.
  • Fluorescent detection of specific glycan epitopes on glycoproteins as well as cell surface.
  • Quantitation of the fucosylation level of specific glycans.
  • Together with CMP-Cy3-Sialic Acid, allows for dual labeling and detection of sialoglycans.

Key Features and Benefits:

  • Excitation at 649 nm and emission at 671 nm, exhibits red fluorescent light under microscope.
  • The fluorescent dye is conjugated to the C6 position of the fucose.
  • Can be directly introduced into glycoproteins and glycolipids via various fucosyltransferases.
  • Can be introduced to live cells for glycan imaging.
  • Has minimum side-effects on target molecules.
  • Very convenient and user-friendly.

For Details:
Wu, ZL. et al., (2020) Glycobiology 30: 970.

Related Reagents

Click Chemistry

Enzymes and detection reagents

Data Examples

Strategies for Probing and labeling substrate glycans of various fucosyltransferases using GDP-Cy5-Fucose.
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Strategies for Probing and labeling substrate glycans of various fucosyltransferases using GDP-Cy5-Fucose. Depicted here are for FUT2, FUT6, FUT7, FUT8 and FUT9. FUT2 introduces Cy5-Fucose to terminal Gal residues. FUT6, FUT7 and FUT9 introduce Cy5-Fucose to the GlcNAc residue in lactosamine structures that can be found on both N- and O-glycans. FUT8 introduces Cy5-Fucose to the innermost GlcNAc residue on N-glycans where there is an unmodified terminal GlcNAc residue in the α3 branch.

Labeling bovine fetuin (Fet) using GDP-Cy5-Fucose.
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Labeling bovine fetuin (Fet) using GDP-Cy5-Fucose. Bovine fetuin was purified from crude fetuin by gel filtration. Samples of fetuin were labeled with Recombinant Human Fucosyltransferase 9/FUT9 Protein (Catalog # 9347-GT). In control lanes, no fetuin was present, revealing the self-labeling of FUT9 itself. Samples were not labeled in the absence of neuraminidase but labeled strongly in the presence of  Recombinant C. perfringens Neuraminidase Protein  (Catalog # 5080-NM), suggesting that all lactosamine structures on the samples were sialylated prior to labeling. Samples were separated on 4-20% gradient SDS-PAGE and imaged with silver staining (left panel) and a fluorescent imager (middle and right panels at different contrasts). M, a prestained Western blot molecular marker that is visible under fluorescent imager.

Cellular glycan imaging with GDP-Cy5-Fucose and CMP-Cy3-Sialic Acid.
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Cellular glycan imaging with GDP-Cy5-Fucose and CMP-Cy3-Sialic Acid. HeLa cells were stained by incorporation GDP-Cy5-Fucose (Catalog # ES301) by Recombinant Human Fucosyltransferase 9/FUT9 Protein (Catalog # 9347-GT) (red) and CMP-Cy3-Sialic Acid (Catalog ES402) by Recombinant Human ST6GAL1 (aa 44-406) Protein (Catalog # 7620-GT) (green). Hela cells on a 96 well plate were briefly treated with Recombinant C. perfringens Neuraminidase Protein (Catalog # 5080-NM) to remove preexisting sialic acids. The treated cells were then labeled by FUT9 and ST6Gal1 simultaneously in the presence of GDP-Cy5-Fucose and  CMP-Cy3-Sialic acid for 30 minutes. After the labeling, the solution was quickly removed by aspiration and washing two times with PBS. Afterwards, the cells were fixed and stained with DAIP (purple) in the presence of 0.5% Triton X 100 to reveal the cell nuclei. All three panels were from a same viewing area and imaged under different channels. These images show that FUT9 and ST6Gal1 stained the same regions on HeLa cells. For details on cell imaging with fluorophore-conjugated sugars, please refer to  Wu. L. et al., (2020) Glycobiology 30:454-462

Table 1. Guideline for using CMP-Cy5-Sialic Acid for sialoglycan labeling and detection

Fucosyltransferase Catalog # Substrate GDP-Cy5-Fucose Tolerance
FUT1   Terminal Gal in H antigen Not determined
FUT2 7770-GT Terminal Gal in H antigen yes
FUT3 4950-GT GlcNAc in type 1 glycan chain yes
FUT4   GlcNAc in terminal lactosamine yes
FUT5 4949-GT GlcNAc in terminal lactosamine yes
FUT6   GlcNAc in terminal lactosamine yes
FUT7 6409-GT GlcNAc in sialylated lactosamine yes
FUT8 5768-GT Core GlcNAc in N-glycans yes
FUT9 9347-GT GlcNAc in non-sialylated lactosamine yes
FUT10    Unknown unknown
FUT11 5964-GT  Unknown unknown
POFUT1  7409-GT Notch receptor Not determined


Store the unopened product at -20 to -70 °C. Use a manual defrost freezer and avoid repeated freeze-thaw cycles. Do not use past expiration date.

Product Datasheets

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Assay Procedure

Sample Protocol for Direct Fluorescent Glycan Labeling with GDP-Cy5-Fucose

Protocols are guidelines. Parameters need to be optimized by end users.


  • Assay Buffer: 25 mM Tris, 10 mM MnCl2, pH 7.5
  • Sample protein
  • Fucosyltransferases such as rhFUT9 (Catalog # 9347-GT) or rhFUT8 (Catalog # 5768-GT)
  • GDP-Cy5-Fucose (Catalog # ES301)
  • Protein sample loading dye
  • SDS-PAGE and Western Blot reagents or equivalent
  • Fluorescent Imager in a far-red fluorescent channel

General Assay Protocol

  1. Prepare a reaction mixture by combining 0.1 to 5 µg of a sample protein, 0.2 nmol GDP-Cy5-Fucose, 0.5 µg of a fucosyltransferases such as FUT9 or FUT8, add Assay Buffer to the final volume to 30 µL.
  2. Prepare a negative control by repeating above but omitting the fucosyltransferases. 
  3. Incubate all the reactions and controls at 37 °C for 60 minutes.
  4. Stop the reactions and controls by adding appropriate volume of protein sample loading dye to each reaction.
  5. Separate the reactions and controls by SDS-PAGE.
  6. Image the gel with a fluorescent imager in a far-red fluorescent channel.
  7. Image the gel with trichloroethanol (TCE) imaging (if TCE is incorporated into the gel) or any other regular protein gel imaging method such as Coomassie® blue staining or silver staining.

Final Assay Conditions Per Reaction

  • Sample protein: 0.1 to 5 µg
  • CMP-Cy3-Sialic Acid:  0.2 nmol
  • Sialyltransferase:  0.5 µg


  1. FUT9 does not recognize sialylated lactosamine. To increase FUT9 labeling on samples that are highly sialylated, small amount of Recombinant C. perfringens Neuraminidase Protein (Catalog # 5080-NM) may be added into the labeling reaction mixture to increase labeling. 
  2. Recombinant Human Tissue alpha-L-Fucosidase/FUCA1 (Catalog #7039-GH) may be used to remove existing fucose residue on samples prior to the reaction to increase labeling. Since the fucosidase is active around pH 4.5 and requires Mg2+, buffer should be conditioned to that of fucosyltransferases after the treatment of fucosidase.


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