Term: proteinase (or
endopeptidase K)
Literally
meaning: “that enzyme which separates
proteins”
Origin: Anc Greek
+πρωτεΐνη/proteini(=protein) > πρώτος/protos(=first or of prime importance)
+(-άση)/(-asy)(=-ase) enzyme suffix added to the
name of the substrate that the enzyme
hydrolyzes eg proteinase for protein or lipase for lipids
>διά-/dia-(=prefix denoting “through”, “apart” )
> δυο/dio(two) + στάσις/stasis(=halt)
> ίστημι/histimi(=stand).
K from keratin > κέρας/keras(=horn)
> (genitive): κέρατος/keratos
Coined/History
Proteinase K was discovered in 1974 , in extracts of the
fungus Engyontium album. The name K is derived from first letter of “keratin” because proteinase K is able to digest native
protein keratin.
Source
Ebeling W, Hennrich N, Klockow M, Metz H, Orth HD, Lang H (1974) Proteinase
K from Tritirachium album Limber”. Eur. J. Biochem. 47
Definition
Proteinase K is a protease that catalyzes the breakdown
of proteins in sites of serine residues.
Proteinase K (PROK) is a serine protease with broad specificity towards aliphatic, aromatic and other hydrophobic amino acids. PROK has a molecular weight of 27,000 daltons and is Ca2+ dependent. It is not inactivated by metal ion chelating agents such as EDTA, sulfhydryl reagents, Proteinase K
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