Structure of Recombinant Enterokinase EC CAS 9017-74-8

Recombinant Enterokinase EC CAS 9017-74-8


CAS Number


EC Number


Recombinant Enterokinase


enterokinase from porcine intestine;
Peptidase, entero-;





Clear,colorless to yellowish liquid

Safety Data

WGK Germany


Specifications and Other Information of Our Recombinant Enterokinase EC CAS 9017-74-8


Single major band



Molecular Weight(SDS-PAGE)

25.8 ±2.6 kDa

Unit definition

One unit is defined as the amount of enzyme needed to cleave 0.5mg of fusion protein in 12 to16 hours to get 95% completion at 25°C in 25mMTris-HCl, pH 8.0. Substrate: a special fusion protein. 


YaxinBio Enterokinase is a kind of highly purified recombinant bovine enterokinase light chain. The enzyme has been extensively purified by HPLC and there are no traces of other contaminating proteases. Enterokinase specifically hydrolyzes peptide bond at the carboxyl side of lysine residue preceded by four aspartic acids: Asp-Asp-Asp-Asp-Lys (DDDDK). So, enterokinase can remove N-terminal fusion protein or tags to get aim protein with native amino acids sequence.


Recombinant enterokinase is a genetically engineered protein expressed in E.coli

Protein Sequence

The amino acid sequence of recombinant enterokinase is identical to bovine enterokinase light chain.

Recommended usage

1.Cutting condition: 25mM Tris-HCl 8.0
Fusion protein concentration: 0.1-1mg/ml (total protein content: 50-100ug);EK content: 0.1-0.2U;Temperature:25℃;Time: overnight or 16h-24h for digestion.
If digestion under 2-8°C,prolong the digestion time two folds,or more enzyme added to short the digestion time.
2.4°C low temperature digestion conditions:
4°C can effectively digest the substrate, but need to extend the digestion time to 48-64h, or increase the amount of 2-3 times the amount of enzyme.
3.Enzyme cleavage optimization and amplification
Optimization: Enzyme cleavage conditions can be optimized, such as buffer pH, fusion protein concentration, EK amount, and digestion time, so that the fusion protein can be digested under stable conditions, SDS-PAGE detection of digestion effect.
Amplification: Select the optimized reaction conditions, according to the conditions such as the proportion of amplification, SDS-PAGE detection of digestion effect.
4.Method for removing recombinant enterokinase: The recombinant enterokinase was removed using trypsin inhibitor affinity chromatography.
Note: do not recommend cutting at 37°C conditions, there may be non-specific enzyme digestion.

Stability of storage

Recombinant enterokinase should be stored under -20°C in sealed container. It is stable within 24 months.If stored at 25°C ,it is stable within one week. It is no activity loss after 5 times repeated freezing and thawing.

Stability of transport

The product is stable by blue ice insulation transport.


  1. Animal origin free: recombinant trypsin is no exogenous virus contamination,and any animal origin material is not used in the production process.
  2. Stable quality: Mass production can ensure stable and continuous batch production.It is no difference between the batch and the product quality is stable.
  3. High purity: Higher specific activity.Host protein residues is less than the limits of biological products.
  4. Lyophilized powder: The product is lyophilized powder and is easy to store and transport.

Watson International Ltd

This product is sold exclusively through our sales company Watson International Ltd, and please click the link below for details.