Complex sentence: ATP binding sites, which may be representative of an ATP binding motif, are present in many proteins which require an input of energy (from ATP), such sites as active membrane transporters, microtubule subunits, flagellum proteins, and various hydrolytic and proteolytic enzymes.
Split into simpler sentences: ATP binding sites, which may be representative of an ATP binding motif, are utilized on many proteins which perform function requiring an input of energy (from ATP). Such sites are located on active membrane transporters, microtubule subunits, flagellum proteins, and various hydrolytic and proteolytic enzymes.