Studying the O-GlcNAcome of human placentas using banked tissue samples
Sarai Luna1, Florian Malard2, Michaela Pereckas1
1Department of Biochemistry, Medical College of Wisconsin, 8701 Watertown Plank Rd., Milwaukee, WI 53226, United States.
Glycobiology
|January 22, 2024
Summary
Mapping the human O-GlcNAcome is crucial for disease biomarkers. This study presents a 3-step workflow using placental tissue to identify O-GlcNAcylated proteins, aiding in understanding O-GlcNAcylation
Area of Science:
- Biochemistry
- Proteomics
- Molecular Biology
Background:
- O-GlcNAcylation is a critical post-translational modification regulating signaling pathways, comparable in scope to phosphorylation.
- The O-GlcNAc modification is increasingly recognized as a significant diagnostic and therapeutic target in various human diseases.
- Comprehensive mapping of the human O-GlcNAcome across diverse tissues is essential for identifying robust disease biomarkers.
Purpose of the Study:
- To develop and validate a workflow for identifying O-GlcNAcylated protein targets in human tissues.
- To establish a method for cleaning banked tissue, enriching O-GlcNAc proteins, and analyzing results for disease relevance.
- To generate a manageable list of O-GlcNAc proteins from human placental tissue for further investigation.
Main Methods:
- Development of a protocol to remove blood proteins from frozen banked human placental tissue.
- Optimization of immunoaffinity purification for the enrichment of O-GlcNAcylated proteins from tissue extracts.
- Implementation of a bioinformatic workflow (CytOVS) for target identification and prioritization based on cellular localization.
Main Results:
- Successful depletion of blood proteins from placental samples, enabling focused analysis of intracellular O-GlcNAcylation.
- Enrichment yielded over 2000 unique N-acetylglucosamine (HexNAc) peptide-spectrum matches (PSMs) and identified approximately 900 unique O-GlcNAc sites.
- Identification of 82 highly expressed placental O-GlcNAc proteins, demonstrating the workflow's efficacy in capturing relevant targets.
Conclusions:
- A robust 3-step workflow enables efficient identification of O-GlcNAcylated proteins from human tissue samples.
- This methodology facilitates the generation of a curated list of potential O-GlcNAc biomarkers for human diseases.
- The study enhances the understanding of O-GlcNAcylation's role in physiological and pathological processes.
