MreB is a protein found in many bacteria that plays a crucial role in maintaining cell shape and structure. It forms a helical filament along the inner membrane of the cell, helping to direct the synthesis of the cell wall. This process is essential for the proper growth and division of bacterial cells. In addition to its structural role, MreB is involved in the organization of other proteins within the cell. It interacts with various enzymes and proteins that are responsible for cell wall biosynthesis, ensuring that the cell maintains its integrity and shape during growth and division.