noun. any enzyme that catalyzes the splitting of proteins into smaller peptide fractions and amino acids by a process known as proteolysis.
- angiotensin converting enzyme
- angiotensin-converting enzyme
- plasminogen activator
Example sentences of the word proteinase
1. Noun, singular or mass
If high purity is not required, scientists may add an enzyme called proteinase K to break down most of the proteins in the sample then use it as-is.