What is the main energy source used by all motor proteins?

The main energy source used by all motor proteins is adenosine triphosphate (ATP). Motor proteins, such as kinesin and dynein, hydrolyze ATP to provide the necessary energy for movement along cytoskeletal filaments, enabling processes like muscle contraction and intracellular transport. The conversion of ATP to ADP and inorganic phosphate releases energy that facilitates their mechanical work.