N-Terminus Leader Sequence of Shiga Toxin (Stx) 1 Is Essential for Production of Active Recombinant Protein in E. coli

Author(s): Mana Oloomi, Saeid Bouzari, Mania Arshadi.

Journal Name: Protein & Peptide Letters

Volume 13 , Issue 5 , 2006

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Escherichia coli clones expressing recombinant shiga toxin (Stx1) and its derivatives Stx1-A and Stx1-B subunits were established to release the proteins into periplasmic space. The expression was examined by SDS-PAGE to visualize the subunits. The secreted assembled subunits were extracted with polymyxin B and assessed for biological activity. The results showed that the presence of N-terminus leader sequence of the gene is essential for assembly of the subunits to yield biologically active holotoxin (AB5). The absence of the leader sequence did not affect the expression of the subunits but did disrupt the holotoxin assembly.

Keywords: Recombinant shiga toxin, Holotoxin assembly, N-terminus leader sequence

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Article Details

Year: 2006
Page: [509 - 512]
Pages: 4
DOI: 10.2174/092986606776819538
Price: $58

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