HKUST Library Institutional Repository Banner

HKUST Institutional Repository >
Biochemistry >
BICH Journal/Magazine Articles >

Please use this identifier to cite or link to this item: http://hdl.handle.net/1783.1/2148
Title: Production of excreted human epidermal growth factor (hEGF) by an efficient recombinant Escherichia coli system
Authors: Sivakesava, S.
Xu, Z. N.
Chen, Y. H.
Hackett, James A.
Huang, R. C.
Lam, E.
Lam, T. L.
Siu, K. L.
Wong, R. S. C.
Wong, Wan-Keung R.
Keywords: hEGF
Excretion
Fermentation
Escherichia coli
Human epidermal growth factor
Issue Date: Oct-1999
Citation: Process biochemistry, v. 34, no. 9, October 1999, p. 893-900
Abstract: Recombinant Escherichia coli JM101 strains harboring plasmids pWKW2 or lacUV5par8EGF, both encoding human epidermal growth factor (hEGF), were used in fermentations to optimize levels of excreted hEGF. Medium composition, inducer level, growth stage at induction, and culture conditions, were optimized with respect to volumetric production of the recombinant protein. MMBL medium, with glucose at 5g/l, and tryptone as nitrogen source, was chosen. Isopropyl-β-D-thiogalactopyranoside(IPTG) concentrations of 0.1mM for E. coli JM101 [pWKW2] and 0.2mM for E. coli K-12 JM101 [lacUV5par8EGF], were found to give the best hEGF production levels. The volumetric yields of hEGF were maximal when the cultures were induced in the mid-logarithmic phase. Growth temperature had a significant effect on hEGF yield. A simple continuous fed-batch process for cultivation of E. coli JM101[pWKW2] was developed. The maximum attained concentration of excreted hEGF in continuous fed-batch cultivation was 325mg/l, as compared to 175mg/l in batch cultivation. The hEGF produced from the continuous fed-batch cultivation was substantiated by SDS-PAGE and immunoblotting.
Rights: Process Biochemistry © copyright (1999) Elsevier. The Journal's web site is located at http://www.sciencedirect.com/
URI: http://hdl.handle.net/1783.1/2148
Appears in Collections:BICH Journal/Magazine Articles

Files in This Item:

File Description SizeFormat
1_2prod.pdfpre-published version1850KbAdobe PDFView/Open

All items in this Repository are protected by copyright, with all rights reserved.