ATPase
ATPase
ATPase (pronounced A-T-P-ase) is a type of enzyme that is involved in the process of hydrolyzing ATP (adenosine triphosphate) to ADP (adenosine diphosphate) and a free phosphate ion. This process releases energy, which is used to drive other chemical reactions in cells.
Etymology
The term "ATPase" is derived from the chemical compound it acts upon, ATP, and the suffix "-ase", which is used in biochemistry to form names of enzymes.
Types of ATPase
There are several types of ATPases, which differ in function and in the way they harness the energy released from ATP hydrolysis.
- F-type ATPase (also called ATP synthase): This type of ATPase is primarily involved in the synthesis of ATP, but it can also work in reverse to hydrolyze ATP.
- V-type ATPase: These ATPases are primarily found in the membranes of organelles like vacuoles and vesicles. They use the energy from ATP hydrolysis to pump protons across the membrane, creating a proton gradient.
- P-type ATPase: These ATPases pump ions across the membrane using the energy from ATP hydrolysis. They are called P-type because they form a phosphorylated intermediate during the reaction.
- E-type ATPase: These ATPases are involved in energy transfer in the cell.
Related Terms
- Hydrolysis: The chemical process in which a molecule is cleaved into two parts by the addition of a water molecule.
- Enzyme: A protein that acts as a catalyst to bring about a specific biochemical reaction.
- Adenosine Triphosphate (ATP): A complex organic chemical that provides energy to drive many processes in living cells.
- Adenosine Diphosphate (ADP): An important organic compound in metabolism and is essential to the flow of energy in living cells.
External links
- Medical encyclopedia article on ATPase
- Wikipedia's article - ATPase
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