Cambio - Excellence in Molecular Biology

Enzymes for Molecular Biology

Enzymes for Molecular Biology: Heat labile & Salt Tolerant Enzymes

New range of enzymes for 2019. Our new range of enzymes include novel enzymes specifically designed or engineered to be amazingly tolerant to high salt concentrations, function at very low temperatures and heat inactivated.

Cryophile Proteinase (heat-labile)

Cryophile Proteinase is an non-specific endopeptidase that has been especially sourced from an Arctic marine microbial source. It has broad substrate specificity and is easy to inactivate after use.


Catalogue No.DescriptionPack SizePriceQty
CA-1726-1000Cryophile Proteinase (heat-inactivated)1000 units (200 U/ml) POA Quantity Add to Order
CA-1726-50Cryophile Proteinase (heat-inactivated)50 units (200 U/ml) POA Quantity Add to Order


Cryophile Proteinase (heat-labile)

Histones and other proteins are known to protect nucleic acids from interacting optimally with other DNA binding proteins and enzymes. Cryophile Proteinase (heat inactivated) is ideally suited for transforming chromatin and other dense protein-bound nucleic acids to their naked form. The enzyme is very easily heat-inactivated thus allowing thermal inactivation at temperatures enabling RNA integrity as well as avoiding dissociation of dsDNA.


Figure 1: Cryophile Proteinase is easy to inactivate after use. Figure shows remaining activity after incubation of Cryophile Proteinase at different temperatures. Incubation for 30 minutes at indicated temperature in presence of 50 (solid line) or 300 (dotted line) mM NaCl. Remaining activity in % of sample kept on ice in same buffer.

Unit definition

One unit is defined as the amount of enzyme that produces one μmol 4-nitroaniline (extinction coefficient 8.8 mM-1 at 410 nm) at 25°C, pH 8.0 per minute (buffer conditions 50 mM Tris-HCl pH 8.0, 1% DMSO, 1 mM Suc-Ala-Ala-Pro-Phe-pNA).

Optimal reaction conditions

Optimal enzyme activity is between pH 7–10. Recommended temperature range for activity is from 25–40°C. Cryophile Proteinase is not dependent of divalent cations such as calcium (Ca2 ) for activity, and is therefore active in buffers containing EDTA (<40°C reaction temperature). Cryophile Proteinase is compatible with digestion of proteins in the presence of SDS  (0.2–1%) and urea (1–5 M). The enzyme tolerates 500 mM guanidine thiocyanate and 1% Triton X-100 (>50% activity). No significant loss of activity at 400 mM NaCl is observed.


Recommended inactivation conditions are incubating the enzyme at 60°C for 15–30 min. Inactivation temperature and time can be adjusted to suit desired application or stringency on residual protease activity. Cryophile Proteinase is susceptible to EDTA and DTT at elevated temperatures (>40°C), so EDTA or DTT will give additive effect upon inactivation.


The enzyme is inhibited by general serine protease inhibitors, such as PMSF.

Storage and stability

Optimal stability and storage condition is between pH 6–9. The enzyme is stable upon storage at -20°C for >1 year. Cryophile Proteinase is also stable upon storage at 4°C (>6 months) and room temperature (>4 weeks). Cryophile Proteinase is stable at dilute concentrations (<0.1 mg/ml) in solutions.


If you cannot find the answer to your problem then please contact us or telephone +44 (0)1954 210 200

Related products

If you cannot find the answer to your problem then please contact us or telephone +44 (0)1954 210 200