The proteins helping an organisms to change its shape are

These are filamentous proteins which enable cells and organisms to contract, to change shape, or to move about. For instance, actin and myosin are responsible for contraction and relaxation of muscle cells and occur in many other types of cells. Myosin also contains ATPase enzyme and is, therefore, both enzymatic and contractile. Tubulin protein is the major component of microtublules which form the locomotory organelles (flagella and cilia), basal bodies, centrioles and spindle apparatus in dividing cells.