Tropomodulin is a protein that plays a crucial role in muscle cells and other types of cells by stabilizing the ends of actin filaments. Actin is a key component of the cytoskeleton, which helps maintain cell shape and enables movement. Tropomodulin binds to the pointed ends of actin filaments, preventing their disassembly and ensuring proper cellular function. This protein is particularly important in cardiac muscle and skeletal muscle, where it contributes to the structural integrity of muscle fibers. Mutations in the tropomodulin gene can lead to various muscle disorders, highlighting its significance in maintaining healthy muscle function.