myosin

Myosin is an ATP-DEPENDENT MOTOR PROTEIN found in MUSCLE CELLS and many other EUKARYOTIC CELLS, where it converts chemical energy from ADENOSINE TRIPHOSPHATE (ATP) into mechanical force. In muscle tissue, myosin molecules assemble into thick MYOSIN FILAMENTS within MYOFIBRILS. During MUSCLE CONTRACTION, myosin heads bind to ACTIN FILAMENTS to form CROSS-BRIDGES and perform a power stroke as part of the SLIDING FILAMENT MECHANISM. This interaction shortens the SARCOMERE, producing contraction in SKELETAL MUSCLE, CARDIAC MUSCLE, and SMOOTH MUSCLE.

Myosin is a muscle protein that uses energy to pull on actin filaments, allowing muscles to contract and move.

• Myosin is a motor protein responsible for producing movement. • It forms the thick filaments inside muscle fibers. • It works together with actin during muscle contraction. • Myosin uses energy from ATP. • The myosin head attaches to actin and pulls it during contraction. • This process is called the sliding filament mechanism. • Myosin is arranged inside sarcomeres of muscle cells. • It is essential for movement, muscle strength, and contraction.