Proteinase K Remains Active:

• Over a wide pH range (optimal activity between 6.5 and 9.5)
• Under denaturing conditions (e.g. the presence of SDS or urea)
• In the presence of metal chelating agents (e.g. EDTA)
• At comparatively high temperatures (optimum digestion temperature is 65°C)

Applications: Removal of endogenous nucleases during the preparation of DNA and RNA; preparation of tissue sections for in situ hybridization.