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Improvement of Soluble Recombinant Interferon-α Expression by Methyl α-D-glucopyranoside in araBAD Promoter System of Escherichia coli

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Author(s)
장병철
Alternative Author(s)
Jang, Byeong Churl
Publication Year
2009
Abstract
To improve the soluble expression of recombinant human interferon-α that was directed by the araBAD promoter system of Escherichia coli, we attempted to control the overall protein expression rate via the addition of a repressor, methyl α-D-glucospyranoside (α-MG). Recombinant interferon-α was usually expressed as an inclusion body at the end of DO (dissolved oxygen)-stat fed-batch culture. However, the addition of 0.0025 to 0.01% α-MG after 0.5% L-arabinose induction effectively inhibited a tendency towards the formation of inclusion bodies, in which 67.6 to 73.1% of the expressed interferon-α was found in the soluble fraction. It was likely that the addition of a repressor after L-arabinose induction partially modulated the transcription rate from the araBAD promoter system and changed the ratio of soluble and insoluble interferon-α expression. This modulation might be considered as a method that can improve the soluble expression level of recombinant protein at the optimal temperature for cell growth.


Keywords
araBAD promoter – methyl α-D-glucopyranoside – soluble expression of interferon-α – modulation of transcription – Escherichia coli
Department
Dept. of Molecular Medicine (분자의학)
Publisher
School of Medicine
Citation
Biotechnology and Bioprocess Engineering, Vol.14(3) : 274-280, 2009
Type
Article
ISSN
1226-8372
DOI
10.1007/s12257-008-0270-6
URI
http://kumel.medlib.dsmc.or.kr/handle/2015.oak/35220
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