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Batch and Fed-Batch Cultivation for Excretive Production of Human Epidermal Growth Factor (hEGF) with Recombinant E. Coli K12 System 

Authors: J. Wang a;  J. Chen b;  R. Xu b; Z. Xu b
Affiliations:   a School of Bioscience and Bioengineering, Southern China University of Technology, Guangzhou, P. R. China
b Institute of Bioengineering, Department of Chemical and Biochemical Engineering, Zhejiang University, Hangzhou, P. R. China
DOI: 10.1080/10826060802165089
Publication Frequency: 4 issues per year
Published in: journal Preparative Biochemistry and Biotechnology, Volume 38, Issue 3 July 2008 , pages 271 - 281
Formats available: HTML (English) : PDF (English)
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Abstract

Batch and fed-batch production of recombinant human epidermal growth factor (hEGF) was studied in an E. coli secretary expression system. By using MMBL medium containing 5 g/L glucose, controlling the temperature at 32°C and maintaining the dissolved oxgen level over 20% saturation, a high yield of hEGF (32 mg/L) was obtained after an 18 hr batch cultivation with 0.2 mM IPTG induction at mid-log phase. Three different glucose feeding strategies were employed to further improve hEGF productivity in a bench top fermentor. Compared with the batch results, hEGF yield was improved up to 25.5% or 28.1%, respectively by intermittent or pH-stat glucose feeding, and up to 150% improvement of hEGF production was achieved by constant feeding of 200 g/L glucose solution at a rate of 0.11 mL/min. The effects of further combined feeding with other medium components and inducer on hEGF yield were also examined in the benchtop fermentor. This work is very helpful to further improve the productivity of extracellular hEGF in the recombinant E. coli system.
Keywords: Culture conditions; E.coli; Excretive production; Fed-batch; hEGF
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