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Matrix Proteoglycans and Glycoproteins

Matrix Proteoglycans and Glycoproteins

Proteoglycans are extensively glycosylated proteins, commonly found in the extracellular matrix, interwoven with collagen fibers. Hyaline cartilage, the most common type of cartilage in the body, consists of short and dispersed collagen fibers associated with large amounts of proteoglycans. These proteoglycans have long negative charges that attract cations, which in turn attract water molecules. This influx of ions and water molecules swells up the proteoglycan like a water-soaked gel that can...

Proteoglycans

Proteoglycans

Glycans, a class of complex heterogeneous molecules, can be covalently attached to proteins to form glycosylated proteins that regulate various physiological and pathological processes. Glycosylated proteins or glycoproteins comprise N-linked and O-linked oligosaccharides. O-glycosylation is the most common type of protein glycosylation. Here, glycans attach to the oxygen atom of the hydroxyl groups of Serine or Threonine residues. O-linked glycosylation occurs later in protein processing,...

Glycosaminoglycans

Glycosaminoglycans

Glycosaminoglycans (GAGs), also known as mucopolysaccharides, are long and linear polymers comprising of specific repeating disaccharides - the amino sugar that can be N-acetylglucosamine or N-acetylgalactosamine, and a uronic acid that is usually glucuronic acid or iduronic acid.
GAGS are found in the extracellular matrix of vertebrates, invertebrates, and bacteria. Due to their polar nature they attract water, and serve as excellent lubricants or shock absorbers in an animal body.
Hyaluronic...

The Extracellular Matrix

The Extracellular Matrix

In order to maintain tissue organization, many animal cells are surrounded by structural molecules that make up the extracellular matrix (ECM). Together, the molecules in the ECM maintain the structural integrity of tissue as well as the remarkable specific properties of certain tissues.Composition of the Extracellular MatrixThe extracellular matrix (ECM) is commonly composed of ground substance, a gel-like fluid, fibrous components, and many structurally and functionally diverse molecules.

The Extracellular Matrix

The Extracellular Matrix

Overview
In order to maintain tissue organization, many animal cells are surrounded by structural molecules that make up the extracellular matrix (ECM). Together, the molecules in the ECM maintain the structural integrity of tissue as well as the remarkable specific properties of certain tissues.
Composition of the Extracellular Matrix
The extracellular matrix (ECM) is commonly composed of ground substance, a gel-like fluid, fibrous components, and many structurally and functionally diverse...

Collagens are the Major Structural Proteins of ECM

Collagens are the Major Structural Proteins of ECM

Three main types of fibers are secreted by fibroblasts: collagen fibers, elastic fibers, and reticular fibers. Collagen fiber is made from fibrous protein subunits linked together to form a long, straight fiber. Collagen fibers, while flexible, have great tensile strength, resist stretching, and give ligaments and tendons their characteristic resilience and strength. These fibers hold connective tissues together, even during the body's movement.
Connective tissue proper includes loose...

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Related Experiment Video

Updated: Jul 18, 2026

3D Hydrogel Scaffolds for Articular Chondrocyte Culture and Cartilage Generation

3D Hydrogel Scaffolds for Articular Chondrocyte Culture and Cartilage Generation

Published on: October 7, 2015

The structure and function of cartilage proteoglycans.

¹Genetics Unit, Shriners Hospital for Children and Department of Surgery, McGill University, Montreal, Quebec, Canada. proughley@shriners.mcgill.ca

European Cells & Materials

|December 1, 2006

Summary

Cartilage proteoglycans like aggrecan are vital for tissue function. Disruptions in their structure or amount can negatively impact cartilage health and performance.

Area of Science:

Biochemistry
Biomaterials Science
Orthopedics

Background:

Cartilage relies on proteoglycans for structural integrity and biomechanical properties.
Key cartilage proteoglycans include aggrecan, decorin, biglycan, fibromodulin, and lumican.
Proteoglycan function is dictated by both core protein structure and glycosaminoglycan chain composition.

Purpose of the Study:

To review the structure/function relationships of cartilage proteoglycans.
To elucidate how alterations in proteoglycan structure or abundance affect cartilage tissue function.

Main Methods:

Literature review of existing research on cartilage proteoglycans.
Analysis of structure-function correlations based on biochemical and biological data.

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Detection of Glycosaminoglycans by Polyacrylamide Gel Electrophoresis and Silver Staining

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Last Updated: Jul 18, 2026

3D Hydrogel Scaffolds for Articular Chondrocyte Culture and Cartilage Generation

3D Hydrogel Scaffolds for Articular Chondrocyte Culture and Cartilage Generation

Published on: October 7, 2015

Characterization of Intra-Cartilage Transport Properties of Cationic Peptide Carriers

Characterization of Intra-Cartilage Transport Properties of Cationic Peptide Carriers

Published on: August 10, 2020

Detection of Glycosaminoglycans by Polyacrylamide Gel Electrophoresis and Silver Staining

Detection of Glycosaminoglycans by Polyacrylamide Gel Electrophoresis and Silver Staining

Published on: February 25, 2021

Main Results:

Detailed examination of individual proteoglycan roles within the cartilage matrix.
Identification of specific structural features and glycosaminoglycan modifications influencing proteoglycan activity.
Correlation of proteoglycan abnormalities with impaired cartilage biomechanics and potential disease states.

Conclusions:

Understanding proteoglycan structure-function is crucial for cartilage health.
Perturbations in proteoglycan homeostasis can lead to cartilage dysfunction and disease.
Further research into proteoglycan biology may offer therapeutic targets for cartilage repair.