Calmodulin

Calmodulin is a small protein found in all eukaryotic cells that plays a crucial role in regulating various cellular processes. It acts as a calcium sensor, binding to calcium ions when their levels rise. Once bound to calcium, calmodulin changes shape and interacts with other proteins to influence various functions, such as muscle contraction, cell growth, and signal transduction. Essentially, calmodulin helps cells respond to changes in calcium levels, making it vital for numerous physiological activities in the body. Its importance highlights how proteins can serve as key regulators in many biological systems.