Actin in muscle tissue

Muscle tissue is primarily composed of only a few types of proteins, with myosin and action being the two most important types in cooking.

About two-thirds of the proteins in mammals are myofibrillar proteins. The amount of actin and myosin differs by animal types and region.

Actin is the second most abundant myofibrillar protein in the myofibrils of cardiac and skeletal muscles, composing approximately 20% of the total.

A monomeric actin molecule is a globular protein and is often referred to as G-actin. These globular monomer are then assembled into an actin filament, called F-actin.

The molecular weight of G-actin is approximately 42,000, the diameter of each G-actin misnomer is approximately 5.0 nm, and each thin filament in skeletal muscle contains approximately 400 molecules of actin.
Actin in muscle tissue