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BioMed Research International
Volume 2013 (2013), Article ID 343195, 6 pages
http://dx.doi.org/10.1155/2013/343195
Research Article

High-Level Expression of Functionally Active Dengue-2 Non-Structural Antigen 1 Production in Escherichia coli

1Department of Biotechnology, Anna University, BIT Campus, Tiruchirappalli 620 024, India
2Centre for Research in Medical Entomology (CRME) (WHO Collaborating Centre for Lymphatic Filariasis and Dengue), Indian Council of Medical Research, Chinna Chokkikulam, Madurai 625 002, India

Received 30 April 2013; Revised 2 August 2013; Accepted 6 August 2013

Academic Editor: Decheng Yang

Copyright © 2013 S. Gowri Sankar 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

Detection of nonstructural protein (NS1) is an important diagnostic marker during acute phase of dengue infection. Not only for diagnostic purpose, the protein had important role in vaccine design as well, as a candidate for studying virus assembly and maturation. Various researchers employed different expression systems and strategies for recombinant NS1 protein production. Attempts to express NS1 protein in prokaryotic and yeast expression system result in formation of insoluble protein which needs to undergo refolding to attain native structural and functional forms. Here, we report the production of soluble NS1 protein in E. coli by using appropriate vector and employing suitable culture conditions to maximize protein production. Proteins were purified using metal affinity chromatography. SDS-PAGE and western blot analysis reveal the native structure of NS1 protein. Solid phase ELISA using the recombinantly expressed antigen with positive and negative dengue samples showed that the expressed protein retains its antigenic and immunological properties. To our knowledge, this is the first report on the successful production of functionally active recombinant dengue-2 NS1 protein production without undergoing any in vitro posttranslational modification process.