What does peptidase mean?
A peptidase is an enzyme that breaks peptide bonds, the chemical links joining amino acids in peptides and proteins. Its action is called hydrolysis: water is used to split a bond, producing shorter peptides or free amino acids. Peptidases differ in their specificity. Some remove amino acids one at a time from the end of a peptide, while others cut internal bonds and fragment a protein into several pieces. They occur throughout cells and body fluids, including the digestive tract, where they help process dietary proteins. In medicine, altered peptidase activity can be associated with disease, and inhibitors of particular peptidases may be used as drugs. The term is therefore precise and technical, appearing in discussions of protein digestion, cell signaling, laboratory research, and therapeutic targets.
nounA peptidase is an enzyme that hydrolyzes peptide bonds, thereby breaking peptides or proteins into smaller peptide fragments or individual amino acids. Peptidases may be specific for particular bonds, sequences, or peptide-chain ends.
- Any enzyme that catalyzes the hydrolysis of peptide bonds in peptides or proteins.
"The researchers measured the peptidase activity in the patient's plasma to identify the cause of the abnormal protein breakdown."
"This membrane-bound peptidase removes the signal peptide from a newly synthesized protein."
"The loss of peptidase activity caused partially digested proteins to accumulate in the cells."
The plural is used when referring to different peptidase enzymes or a class of peptidases.
"Several membrane-bound peptidases were detected in the cell membrane."
Peptidases are molecular scissors, but they are selective: some target a particular bond or chain end, making their exact specificity essential in biology and medicine.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does peptidase come from?
The word combines "peptide," from Greek peptikos, meaning "digestive" or "capable of digestion," with the suffix "-ase," which denotes an enzyme. Peptidase developed in the scientific vocabulary of the early 20th century as a name for enzymes acting on peptide bonds. It shares its Greek root with peptide, peptidic, and peptone, all words connected with digestion or digested substances.
How peptidase is actually used
A specialized biochemical term used mainly in biology, biochemistry, pharmacology, and medicine. It is more technical than the general term "protein-degrading enzyme" and is often qualified by the substrate, cellular location, or class of peptide bond involved.