Proteinase K (PK) from fungi, Tritirachium album encodes a 40 kDa protein. The N-terminal propeptide region shows homology with bacterial subtilisin. PK crystallizes even under microgravity conditions on the space shuttle mission. PK is an effective protein system for studying protein engineering…

Proteinase K is an extracellular endopeptidase. It is synthesized by the mold Tritirachium album Limber. Proteinase K belongs to a new subfamily of the subtilisins. It is a 277 amino acid protein with a molecular weight of 28,930 Da. Active proteinase K is characterized with an unhydrolysed…