Myosin light chains

Myosin light chains are the light-chain isoforms of myosin, the small protein subunits associated with the neck region of each myosin heavy chain. They form the main structural element of the myosin molecule’s lever arm, stabilizing the head domain that interacts with actin during contraction. Although they do not seem to contribute directly to the heat-induced gelation of myosin, they may help to stabilize the gel network once it is formed, supporting the texture of cooked meat products. Also known as light meromyosin, these subunits include essential and regulatory light chains whose phosphorylation modulates contractile activity in living muscle. In food science their practical interest lies mainly in how they maintain myosin’s structural integrity through extraction, salting, and thermal processing of meat systems.