3 Transport laktozy

Figurę 20-29

E. coli. H⁺ binds first to E-2 outside the celi, followed by lactose. They are released in random order from E-l inside the celi. E-2 must bind both lactose and H' in order to change conformation to E-l, thereby cotransporting these substances into the celi. E-l changes conformation to E-2 when neither lactose nor H⁺ is bound, thus completing the transport cycle.