A protein pump is an active transport system that transports ions and molecules.
It is a type of membrane protein that requires energy to move molecules across the cellular membrane against a concentration gradient the energy source needed for active mobility is ATP.
Active transport:
The transfer of molecules from an area of lower concentration to a region of higher concentration is known as active transport.
Active transport can be either primary or secondary.
Whereas secondary transport moves molecules or ions using electrochemical energy, primary transport uses the energy released when ATP is broken down.
Proteins are known as "protein pumps" in the case of primary active transport because they "pump" ions or molecules against their concentration gradient.