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Int. J. Mol. Sci. 2007, 8, 478-491
International Journal of
Molecular Sciences
ISSN 1422-0067
© 2007 by MDPI
/ijms/
Full Research Paper
High-level Expression of Cecropin X in Escherichia coli
Yi Shen 1,*, Xue Gang Lao 2, Yuan Chen 1, Hong Zu Zhang 1 and Xian Xiu Xu 1
1 State Key Laboratory of Pharmaceutical Biotechnology, Department of Biochemistry, Nangjing
University, Nanjing 210093, P.R. China
2 Zhejiang Medicine Company, Ltd., Xinchang Pharmaceutical Factory, Xinchang County, Zhejiang
Province 312500, P.R. China; E-mail: laoxg@
* Author to whom correspondence should be addressed; Tel.: +86 025
Fax: +86 025 E-mails: shenyi@, hzzhang@
Received: 6 February 2007 / in Revised Form: 23 April 2007 / Accepted: 25 May 2007 /
Published: 4 June 2007
Abstract: Cecropin X is a short cationic peptide with a broad antibacterial and antitumor
spectrum. Here, we report the production of a tumor necrosis factor (TNFα)-cecropin X
fusion protein under the control of a temperature-inducible PR promoter in the bacterial
expression vector pRC. During fermentation, we studied and optimized essential
parameters including the type of host cells, medium, timing of induction, post-induction
time and dissolved oxygen level. Using the suitable conditions in the fermentation, up to
20 % ~ 23 % of the total cellular proteins is produced as the fusion protein, most
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