This family of ATPase membrane proteins tend to be involved in [[Active Transport - Physiology#Secondary Active Transport|secondary active transport]]. They bind two molecules and transport them across the membrane either in the same direction ('''symporter''') or in opposite directions ('''antiporter'''). The [[Active Transport - Physiology#Development of Potential Energy|potential energy]] derived from forcing one molecule across this allows the other co-transported molecule to be transported against its gradient. | This family of ATPase membrane proteins tend to be involved in [[Active Transport - Physiology#Secondary Active Transport|secondary active transport]]. They bind two molecules and transport them across the membrane either in the same direction ('''symporter''') or in opposite directions ('''antiporter'''). The [[Active Transport - Physiology#Development of Potential Energy|potential energy]] derived from forcing one molecule across this allows the other co-transported molecule to be transported against its gradient. |