A fluorescence-based assay for Core 1 β3galactosyltransferase (T-synthase) activity

Area of Science:

• Biochemistry
• Glycobiology
• Enzymology

Background:

• Mucin-type O-glycans are vital for numerous cellular functions.
• Core 1 β3galactosyltransferase (T-synthase) is essential for O-glycan synthesis.
• Existing radioactive assays for T-synthase activity are cumbersome.

Purpose of the Study:

• To develop a novel, sensitive fluorescence-based assay for T-synthase activity.
• To provide a non-radioactive alternative for assessing O-glycan biosynthesis.
• To enable high-throughput screening of T-synthase activity.

Main Methods:

• Utilized 4-methylumbelliferone-α-GalNAc as an acceptor substrate and UDP-Gal as a donor.
• Quantified T-synthase activity by measuring fluorescent 4-methylumbelliferone released after O-glycosidase hydrolysis.
• Employed a fluorescent detector with excitation at 355 nm and emission at 460 nm.

Main Results:

• Successfully established a fluorescence-based assay for T-synthase.
• The assay demonstrated high sensitivity and reproducibility.
• The method is adaptable for high-throughput applications and not dependent on enzyme source.

Conclusions:

• The developed fluorescence assay is a simple, sensitive, and reproducible method for measuring T-synthase activity.
• This assay provides a valuable tool for O-glycan research and drug discovery.
• The assay's adaptability supports its use in high-throughput screening platforms.