Ranked 1st in our list of recommended enzymes and sells for $132.58 (as of 15/01/2019 04:12 PST details ) , more than 100% of the IBI Scientific IB05402 reviews are positive. With features such as proteinase k is a stable greater than 50mg ml powder highly active proteolytic enzyme that is purified from the mold tritirachium album and the enzyme has two binding sites for ca , which lie some distance from the active site, and is not directly involved in the catalytic mechanism, it is indeed our top pick among enzymes.