Mucin Glycosylation
Mucin Glycosylation - Related Videos
11:39
Using Unfixed, Frozen Tissues to Study Natural Mucin Distribution
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Cited by 39 •
2012
Unfixed frozen tissue samples embedded in Optimal Cutting Temperature medium (OCT) can be used to study natural distribution and glycosylation of secreted mucus. In this approach tissue processing is minimal and the natural presentation of glycolipids, mucins and glycan-epitopes is preserved. Tissue sections can be analyzed by immunohistochemistry using fluorescence or chromogenic detection.
08:51
Profiling of Permethylated Mucin O-glycans Using Matrix-assisted Laser Desorption/Ionization Time-of-flight Mass Spectrometry
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2025
Here, we present a detailed protocol for the release of O-glycans from mucins, and the subsequent desalting, permethylation, and analysis using MALDI-TOF mass spectrometry.
01:25
Protein Glycosylation
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2023
Glycosylation, the most common post-translational modification for proteins, serves diverse functions. Adding sugars to proteins makes the proteins more resistant to proteolytic digestion. Glycosylated proteins can act as markers and receptors to promote cell-cell adhesion. Additionally, they have many essential quality control functions in the cell, such as correct protein folding and facilitating transport of misfolded proteins to the cytosol, which can be degraded. Glycosylation occurs in...
11:27
Analysis of SCAP N-glycosylation and Trafficking in Human Cells
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Cited by 17 •
2016
We describe a modified method for membrane fraction isolation from human cells and sample preparation for the detection of SCAP N-glycosylation and total protein by using western blot. We further introduce a GFP-labeling method to monitor SCAP trafficking using confocal microscopy. This protocol can be used in regular biology laboratories.
09:54
Identification and Characterization of Protein Glycosylation using Specific Endo- and Exoglycosidases
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Cited by 31 •
2011
Using specific glycosidases to remove sugars from glycoproteins followed by SDS-PAGE is a valuable method to detect glycan modifications on protein samples and is a good choice for initial glycobiology studies. Changes following deglycosylation can be detected as shifts in gel mobility or by staining with glycan sensitive reagents.
FAQs
The process is initiated when glycosyltransferases attach N-acetylgalactosamine to serine or threonine residues on mucin proteins. Subsequent reactions in the Golgi apparatus extend and modify the O-linked glycans, creating a structurally remodeled carbohydrate layer rather than a fixed, single sugar attachment. This sequence establishes the framework for later changes in mucin behavior.
These sugars contribute to the final architecture of O-linked glycans, and their arrangement affects how mucins interact with water, neighboring molecules, microbes, and immune cells. Consequently, changes in glycan composition can modify mucus hydration and viscosity while also changing the molecular recognition properties of the epithelial barrier.
Golgi processing converts initially attached carbohydrate units into extended and modified O-linked structures. That remodeling is important because mucin performance depends on more than the protein backbone: glycan architecture helps determine physical properties such as viscosity and hydration, as well as interactions with biological partners. Altered processing can therefore change barrier behavior.
Changes in the carbohydrate structures displayed by mucins can modify recognition by microbes and immune cells. The same structural differences may also influence hydration and viscosity, linking molecular recognition with the physical behavior of mucus. This helps explain why glycosylation changes are relevant to infection and inflammation rather than being merely biochemical variations.
A useful analysis follows both the carbohydrate structures and their functional consequences. Researchers can examine the initial N-acetylgalactosamine attachment, subsequent Golgi extension and modification, and resulting effects on hydration, viscosity, molecular interactions, and recognition by microbes or immune cells. Considering these linked levels connects enzymatic remodeling with epithelial barrier performance.
Investigating these glycan changes can clarify how mucus barriers are altered in infection, inflammation, and cancer. The topic connects enzymatic activity in mucin-producing pathways with changes in barrier properties and cellular recognition. Because the resulting patterns may distinguish biological states, mucin glycosylation also supports biomarker development and the study of disease-associated epithelial changes.
Strategies can focus on altering the glycan structures that shape mucus hydration, viscosity, molecular interactions, and recognition. Understanding which enzymatic additions or remodeling steps produce particular barrier properties provides a basis for considering how mucus-based defenses might be modified. This application remains tied to the relationship between glycan architecture and epithelial protection.