APOA2

Apolipoprotein A-II (APOA2) is a protein that in humans is encoded by the APOA2 gene. It is a component of high-density lipoprotein (HDL), which is often referred to as "good cholesterol". APOA2 plays a crucial role in lipid metabolism and has been implicated in various diseases, including cardiovascular disease and obesity.

Structure

APOA2 is a relatively small protein, consisting of 77 amino acids. It is synthesized in the liver and then secreted into the bloodstream, where it associates with HDL particles. The structure of APOA2 is characterized by a high proportion of alpha-helix structures, which allow it to bind to lipids and contribute to the stability of HDL particles.

Function

The primary function of APOA2 is to participate in the reverse transport of cholesterol from tissues to the liver. It does this by binding to lipids and helping to form HDL particles, which can carry cholesterol and other fats through the bloodstream. In addition to its role in lipid metabolism, APOA2 has also been shown to have anti-inflammatory and antioxidant properties.

Clinical significance

Variations in the APOA2 gene have been associated with differences in HDL levels and the risk of cardiovascular disease. Some studies have also suggested that APOA2 may play a role in the development of obesity, as certain variants of the gene have been linked to increased body weight and fat mass. However, more research is needed to fully understand the implications of these findings.

See also

• Apolipoprotein
• High-density lipoprotein
• Cardiovascular disease
• Obesity