Profilin is a small protein that plays a crucial role in the regulation of the cytoskeleton, which is the structural framework of cells. It primarily binds to actin, a protein that forms microfilaments, helping to control the growth and organization of these filaments. By promoting the addition of actin monomers to the growing ends of filaments, profilin facilitates cell movement and shape changes. In addition to its role in actin dynamics, profilin is involved in various cellular processes, including cell signaling and cell division. It interacts with other proteins and molecules, influencing how cells respond to their environment. Understanding profilin's functions can provide insights into cellular behavior and potential implications in diseases.