Fluorescein mono-β-D-N-acetylgalactosamine

Product ID: M1040

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Useful fluorescent substrate for galactosaminidase or hexosaminidase activity measurements in Tay-Sachs and Sandhoff diseases.

Hexosaminidase (EC is an enzyme involved in the hydrolysis of terminal N-acetyl-D-hexosamine residues in N-acetyl-β-D-hexosaminides including N-acetylglucosaminides and N-acetylgalactosaminides. The enzyme is able to hydrolyze GM2 gangliosides into GM3 gangliosides by removing the N-acetylgalactosamine from gangliosides. Tay-Sachs disease occurs when hexosaminidase A loses its ability to function. People with Tay-Sachs disease are unable to remove the GalNAc residue from the GM2 ganglioside, and as a result, they end up storing 100 to 1000 times more GM2 gangliosides in the brain than a normal person. Fluorescein mono-β-D-N-acetylgalactosamine is a specific substrate for the HexA/B isozymes responsible for these activities. For additional uses, see the references belowThe fluorescent product (fluorescein) has Abs 488nm/Em 512 nm.

Technical Data
SKU M1040
Unit Size 5mg
Alternative Names Fluorescein mono-(N-acetyl-β-D-galactosaminide)
Detection Method Fluorescence
Molecular Formula C₂₈H₂₅NO₁₀
Molecular Weight 535.15
Soluble In DMSO, H2O
Storage Conditions -20C, Desiccated

References and Citations


  • "A microplate fluorimetric assay for transfection of the beta-galactosidase reporter gene." Rakmanova VA, MacDonald RC. Anal Biochem 257: 234 (1998).
  • "Preparation of N-acetyl-b-D-glucosamine glycosides of fluorescein derivatives as reagents for determination of N-acetyl-b-D-glucosaminase (NAGase)." Kasai K, Uchida R, Okada K, Yamatsugu N. Jpn. Kokai Tokkyo Koho 8 pp. (1993).
  • "Glycosides having chromophores as substrates for sensitive enzyme analysis. IV. Synthesis of N-acetyl-b-D-glucosaminides of fluorescein derivatives and their application to the rate-assay of N-acetyl-b-D-glucosaminidase." Kasai K, Uchida R, Yamaji N. Chemical & Pharmaceutical Bulletin 41(2): 314-18 (1993).
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