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Journal of Biomedicine and Biotechnology
Volume 2009, Article ID 591923, 8 pages
http://dx.doi.org/10.1155/2009/591923
Research Article

A Novel Method for High-Level Production of TEV Protease by Superfolder GFP Tag

Department of Physiology and Biophysics, School of Life Sciences, Fudan University, Shanghai 200433, China

Received 25 August 2009; Revised 25 October 2009; Accepted 2 December 2009

Academic Editor: Claudio M. Soares

Copyright © 2009 Xudong Wu et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Because of its stringent sequence specificity, tobacco etch virus (TEV) protease is widely used to remove fusion tags from recombinant proteins. Due to the poor solubility of TEV protease, many strategies have been employed to increase the expression level of this enzyme. In our work, we introduced a novel method to produce TEV protease by using visible superfolder green fluorescent protein (sfGFP) as the fusion tag. The soluble production and catalytic activity of six variants of sfGFP-TEV was examined, and then the best variant was selected for large-scale production. After purified by Ni-NTA affinity chromatography and Q anion exchange chromatography, the best variant of sfGFP-TEV fusion protease was obtained with purity of over 98% and yield of over 320 mg per liter culture. The sfGFP-TEV had a similar catalytic activity to that of the original TEV protease. Our research showed a novel method of large-scale production of visible and functional TEV protease for structural genomics research and other applications.