Collagen VI

Collagen VI is a type of collagen that is primarily associated with the extracellular matrix, a complex network of macromolecules that provide structural and biochemical support to surrounding cells. It is a crucial component of the microfibril structure and plays a significant role in cell adhesion and migration, as well as tissue integrity and resilience.

Structure

Collagen VI is composed of three alpha chains: alpha-1(VI), alpha-2(VI), and alpha-3(VI). These chains form a heterotrimeric molecule with a unique "beads-on-a-string" structure. The central part of the molecule, known as the triple helical domain, is flanked by globular domains at both ends. The N-terminal globular domain (N10) is involved in the formation of microfibrils, while the C-terminal globular domain (C5) is implicated in the interaction with other extracellular matrix components.

Function

Collagen VI is involved in a variety of biological functions. It plays a crucial role in maintaining the structural integrity of tissues, particularly in the skin, muscle, and cartilage. It also contributes to cell adhesion, migration, and survival, and is involved in the regulation of angiogenesis and inflammation.

Clinical significance

Mutations in the genes encoding the alpha chains of collagen VI can lead to a group of rare genetic disorders known as collagen VI-related myopathies, which include Ullrich congenital muscular dystrophy, Bethlem myopathy, and intermediate phenotypes. These disorders are characterized by muscle weakness, joint contractures, and skin abnormalities.

See also

• Collagen
• Extracellular matrix
• Microfibril
• Ullrich congenital muscular dystrophy
• Bethlem myopathy