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Home > Inhibitor Cocktails > Protease Inhibitor Cocktail (EDTA-Free, mini-Tablet)

Protease Inhibitor Cocktail (EDTA-Free, mini-Tablet) 

Cat.No. Size Price Quantity  
B14011 10 pcs USD 84
B14012 100 pcs USD 594
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Description

Endogenous proteins are produced and removed in a balanced state, so their cellular levels are generally stable under stable environmental conditions. However, protein production is greatly halted and degradation is enhanced when cells are studied in vitro. To prevent the degradation of proteins under such conditions, one can utilize a cocktail of small molecule inhibitors to block the action of proteases. Generally, protease inhibitor cocktails are used in mammalian cell lysates or tissue extracts to increase protein stability. As the name indicates, the cocktail functions to inhibit proteases that would degrade either phosphorylated or non-phosphorylated protein substrates. Bimake Protease Inhibitor Cocktail (EDTA free, mini-Tablet) is a blend of 5 pan-protease inhibitors for protection of protein integrity.

Components

Contents Cat#:B14011 Cat#:B14012
Protease Inhibitor Cocktail (EDTA free, mini-Tablet) 10 Tablets (1 Tablet for 10mL) 100 Tablets (1 Tablet for 10mL)
Ingredient Target Inhibitor Type
AEBSF Serine proteases Irreversible
Aprotinin Serine proteases Reversible
Bestatin Aminopeptidases Reversible
E-64 Cysteine proteases Irreversible
Leupeptin Serine and cysteine proteases Reversible

Storage

Protease Inhibitor Cocktail (EDTA free, mini-Tablet) can be stored at 4°C for 2 years.

Notice

1. For faster dissolution, vortex briefly after adding the mini-Tablet into the extraction media or ddH2O.
2. Some DUB proteases (one example is ATAXIN-3) cannot be suppressed by traditional protease inhibitors, such as E-64, AEBSF, bestatin, leupeptin and Aprotinin. (Reference: Neil D. Rawlings, Guy Salvesen et al. Handbook of Proteolytic Enzymes, Vol.1, 2012).

Protocol

1. This product can be applied in Western Blot analysis, Co-IP, pull-down, IF, IHC, kinase assay and etc.
2. One mini-Tablet can be added to 10mL extraction medium directly. Alternatively, a stock solution (10X conc. one mini-Tablet in 1mL ddH2O) can be prepared. Vortex briefly to accelerate the dissolution. The stock solution is stable for one week when stored at 4°C, and for at least 4 weeks at -20°C.

Trouble Shooting

Problem Suggestion
Could protease inhibitor cocktail be diluted more than instructed? The inhibition effects relies on many factors, such as the protein degradation tendency, the concentrations and activities of proteases, inhibitor concentrations. Bimake protease inhibitor cocktail uses classic combination of inhibitors of sufficient concentration to ensure full protection against different proteases. To achievebest protection, the products should be diluted strictly according to instructed proportion.
Could Tablet components cause problems in my experiments? To minimize the influence of extra components, Bimake Protease Inhibitor mini-Tablet has an optimized formulation. The tablet is easy to dissolve, and produces to clear solution without bubble generation. It is widely compatible with life science experiments, including high demanding applications such as protein crystallization and Co-IP.
Tablet or solution, which kind of protease inhibitor cocktail should I choose? Some details are important when choosing which cocktail to use. Both formulas contain additives. The tablet has several pharmaceutical components which are usually proprietary and non-publicized, while the solution cocktail has DMSO as a solvent. Generally, these additives do not influence product performance. In industrial production, solutions are less processed than tablets, which results in a better quality and lower prices for solutions. On the other hand, tablets possess advantages over solutions in both storage and shipment, as tablets can be stored at 4 degrees instead of -20 degrees. We recommend solution products, as they have a lower price, more accurate inhibitor doses, and readiness to aliquot.
Why to use protease inhibitor cocktail? Protease inhibitor cocktail is low-toxic agent which comprehensively protect proteins from degradation by variousproteases. As the development of life science, more and more researches focus on proteins of low concentration, such as proteins in signal pathway. Precious as these low content protein, protease inhibitor cocktail offer more reliable protection than single inhibitorlike PMSF.
Even after using the protease inhibitor cocktail, experimental results were poor. How can this problem be improved? Bimake's protease inhibitor cocktail can provide adequate protection for most proteins. If protein degradation remains severe with cocktail addition, carefully check the experimental protocol and procedures for optimal use of the protease inhibitor cocktail. For example, the lysis buffer system must be carefully prepared, and with the addition of protease inhibitor cocktail, the cell samples should be treated immediately after being collected or thawed.
PMSF is often used to protect proteins. Does protease inhibitor cocktail possess advantage over PMSF? PMSF is a traditional serine protease inhibitor, widely used in protein purification by addition to cell lysis buffer. As PMSF have many shortages, it is gradually replaced by protease inhibitor cocktail which has better protective performance and is safer to use. To minimize the toxicity, AEBSF is choosed to replace PMSF in protease inhibitor cocktail. As LD50 of AEBSF and PMSF are 2834 mg/kg versus 200 mg/kg, AEBSF is 14 times safer than PMSF. At the same time, they have equal inhibitory efficiency. Another flaw of PMSF is that it is easy to degrade in water solution, with half-time period of 30 minutes. Protease inhibitor cocktail provides protection not only more comprehensive but also more durable.

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Protease Inhibitor Cocktail (EDTA-Free, mini-Tablet)      MSDS

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