cOmplete™ Protease Inhibitor Cocktail

Synonym: protease inhibitor tablet

Application
cOmplete™ is used for the inhibition of serine, cysteine, and metalloproteases in bacterial, mammalian, yeast, and plant cell extracts. cOmplete contains both reversible and irreversible protease inhibitors. Therefore, we recommend the addition of cOmplete to all stock buffers and solutions normally protected with protease inhibitors, and not just during the initial purification steps.

cOmplete contains EDTA (1 tablet yields a 1 mM EDTA solution in 50 ml). Therefore, the extraction buffer should not contain divalent cations like Ca²⁺ , Mg²⁺, or Mn²⁺, otherwise the inhibition of the metalloproteases might be incomplete. If the protein of interest will be purified by IMAC (Immobilized Metal Affinity Chromatography), for example, Poly-His-tagged recombinant proteins, EDTA has to be eliminated (e.g., by dialysis) prior to the chromatography. Alternatively, the product cOmplete EDTA-free can be used. These tablets are identical to cOmplete, with the exception that no EDTA or other chelating agent is present.

cOmplete Tablets inhibit proteolytic activity in large extraction volumes (up to 50 ml). If you are working with smaller volumes (up to 10 ml), we recommend to use cOmplete, Mini. The composition of the cOmplete, Mini Tablet is identical to the normal cOmplete Tablet.

Features and Benefits
Use cOmplete Protease Inhibitor Tablets to protect your proteins from a wide range of proteases. In just minutes, uninhibited proteolytic activity can degrade the protein you have spent days isolating. Each of these convenient water-soluble tablets contains a blend of protease inhibitors that inhibits proteolytic activity from most cell types, including animals, plants, yeast, and bacteria. No weighing or measuring is necessary, ensuring consistent results.

• Easy-to-use: Simply drop a quick-dissolving tablet into your buffer.
• Complete protection: Instantly protect your proteins against a broad range of proteases.
• Flexible: Protect proteins in extracts from almost any tissue or cell, including animals, plants, yeast, bacteria, or fungi.
• Safe: Choose non-toxic inhibitors that pose no risk to you or those around you.
• Suitable for IMAC purification: Purify poly-histidine tagged proteins with cOmplete His-Tag Purification Resin.

General Description
cOmplete Protease Inhibitor Tablets inhibit a broad spectrum of serine, cysteine, and metalloproteases, as well as calpains. Due to the optimized composition of the tablets, they show excellent inhibition effects, and are well suited for the protection of proteins isolated from animal tissues, plants, yeast, and bacteria. cOmplete tablets contain EDTA and both irreversible and reversible protease inhibitors.

Other Notes
Inhibition efficiency is quickly and sensitively tested with the Universal Protease Substrate. For life science research only. Not for use in diagnostic procedures.

Preparation Note
Working concentration: 1 tablet per 50 ml extraction solution
Working solution: Preparation of Working Solution:
One cOmplete Protease Inhibitor Tablet is sufficient for the inhibition of the proteolytic activity in 50 ml extraction solution. If very high proteolytic activity is present, one tablet should be used for 25 ml extraction buffer. Tablets can be added directly to the extraction medium. Alternatively, a stock solution (25 X conc.) can be prepared.

Preparation of Stock solution (25 X conc.):
Dissolve one cOmplete Protease Inhibitor tablet in 2 ml dist. water or in 2 ml 100 mM phosphate buffer, pH 7.0. The stock solution can also be prepared in 10 mM Tris buffer, pH 7.2 to 7.5.
Storage conditions (working solution): The stock solution can be stored at 2 to 8 °C for 1 to 2 weeks, or at least 12 weeks at -15 to -25 °C.

Quality
Performance-tested with pancreas extract.

Reconstitution
Soluble in aqueous buffers, or add directly to extraction media. Alternatively, prepare 25x stock solutions in 2 ml water or 100 mM phosphate buffer, pH 7.0. Stock solution is stable for 1 to 2 weeks at 2 to 8 °C or at least 12 weeks at -15 to -25 °C; can also be used in thiol-containing solutions at 15 to 25 °C.

Specificity
Mixture of several protease inhibitors with broad inhibitory specificity. For the inhibition of serine, cysteine, and metalloproteases in bacterial, mammalian, yeast, and plant cell extracts.

Physical form
Tablets in glass vials

Legal Information
cOmplete is a trademark of Roche