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Measuring O-GlcNAc cleavage by OGA and cell lysates on a peptide microarray
Suhela Sharif1, Jie Shi1, Mostafa Bourakba2
1Department of Chemical Biology and Drug Discovery, Utrecht Institute for Pharmaceutical Sciences, Utrecht University, P. O. Box 80082, 3508 TB Utrecht, The Netherlands.
Analytical Biochemistry
|June 3, 2017
Summary
A new O-GlcNAcylated peptide array effectively measures O-GlcNAcase (OGA) activity in cancer cells. This tool shows promise for cancer research and biomarker development by revealing varying OGA levels in different cancer types.
Area of Science:
- Biochemistry
- Molecular Biology
- Cancer Research
Background:
- O-GlcNAcylation is a crucial post-translational modification impacting cell signaling and gene expression.
- Dysregulation of O-GlcNAcylation is linked to cancer development, including tumorigenesis and metastasis.
- There is a need for advanced analytical methods to study O-GlcNAcylation in cancer.
Purpose of the Study:
- To evaluate an O-GlcNAcylated peptide array for analyzing O-GlcNAcase (OGA) activity.
- To investigate OGA substrate specificity using the peptide array.
- To assess OGA activity in various cancer cell line lysates.
Main Methods:
- Development and application of an O-GlcNAcylated peptide microarray.
- Assay of O-GlcNAcase (OGA) activity using the peptide array.
- Analysis of OGA activity in purified proteins and cancer cell lysates.
- Testing the inhibitory effect of thiamet G on OGA activity.
Main Results:
- The peptide array successfully detected OGA activity.
- OGA activity was inhibited by thiamet G, confirming assay specificity.
- Significant variations in OGA activity were observed across different cancer cell line lysates.
- The array demonstrated substrate specificity for OGA.
Conclusions:
- The O-GlcNAcylated peptide array is a valuable tool for studying OGA activity and its role in cancer.
- This technology can aid in understanding cancer biology and identifying potential biomarkers.
- The observed differences in OGA activity suggest its involvement in cancer progression.
