Refolding of the fusion protein of recombinant enterokinase light chain rEKL / 生物工程学报
Chinese Journal of Biotechnology
;
(12): 811-815, 2006.
Article
in Chinese
| WPRIM
| ID: wpr-325467
ABSTRACT
The fusion protein of enterokinase light chain, DsbA-rEKL, was expressed mainly in inclusion body in E. coli. The recombinant bacteria was fermented to high density, with high expression of the fusion protein. After being washed with 0.5% Triton X-100 and 4mol/L urea, the inclusion body was dissolved in 6mol/L guanidine and 100mmol/L DTP, derivatized by cystine and refolded by pulse refolding. The strategy of pulse refolding involved the addition of 0.03mg/mL of fusion protein until its final concentration reached 0.3mg/mL. The refolded protein was autocleaved and the active EKL molecule was released after adding 2mmol/L CaCl2. Using the two-step purification processes of IDA-Sepharose chromatography and Q-Sepharose chromatography, the purity of rEKL was found to be above 95%, with a high activity to cleave the recombinant reteplase fusion protein Trx-rPA. The yield of purified rEKL was more than 60mg/L of cultures. As a result, the therapeutic proteins like rPA could be produced on a large-scale in a way such as expressed in the form of fusion proteins.
Full text:
Available
Index:
WPRIM (Western Pacific)
Main subject:
Recombinant Fusion Proteins
/
Enteropeptidase
/
Chemistry
/
Protein Folding
/
Escherichia coli
/
Genetics
Language:
Chinese
Journal:
Chinese Journal of Biotechnology
Year:
2006
Type:
Article
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