A novel fluorescent assay for T-synthase activity.

Area of Science:

• Biochemistry
• Glycobiology
• Molecular Biology

Background:

• T-synthase (uridine diphosphate galactose:N-acetylgalactosaminyl-α1-Ser/Thr β3galactosyltransferase) is essential for mucin-type core 1 O-glycan synthesis.
• Loss of T-synthase activity is implicated in human diseases such as cancer, Tn syndrome, and IgA nephropathy.
• Existing enzyme assays are cumbersome, utilizing radioactive substrates and complex product isolation.

Purpose of the Study:

• To develop a novel, non-radioactive fluorescent assay for measuring T-synthase activity.
• To establish a high-throughput method for assessing T-synthase function in biological samples.
• To investigate the correlation between T-synthase deficiency and mutations in the Cosmc chaperone gene.

Main Methods:

• Development of a novel fluorescent assay to quantify T-synthase enzymatic activity.
• Application of the assay to various human tumor cell lines.
• Analysis of gene mutations in the molecular chaperone Cosmc.

Main Results:

• A new fluorescent assay for T-synthase activity was successfully developed and validated.
• T-synthase deficiencies were observed to correlate with mutations in the Cosmc gene.
• The assay demonstrated efficacy in measuring T-synthase activity in tumor cell lines.

Conclusions:

• The novel fluorescent assay provides a facile and high-throughput method for measuring T-synthase activity.
• This assay can be used for screening tumor specimens and other biological materials.
• The findings suggest potential diagnostic applications for detecting T-synthase deficiencies in diseases.