Cloning and Prokaryotic Expression of C-type Lysozyme Gene from Agrius convolvuli

  • Kim, Jong-Wan (Department of Biological Sciences, Dankook University) ;
  • Yoe, Sung-Moon (Department of Biological Sciences, Dankook University)
  • Published : 2008.09.30

Abstract

We have isolated and characterized Agrius convolvuli cDNA encoding a c-type lysozyme. The cDNA sequence encodes a processed protein of 139 amino acid residues with 19 amino acid residues amino-terminal signal sequence and 120 amino acid residues mature sequence. The amino acid residues responsible for the catalytic activity and the binding of the substrate are conserved. Agrius lysozyme has a high identity to Manduca sexta. Recombinant A. convolvuli lysozyme was expressed in Escherichia coli BL21(DE3) pLysS cells for pGEX 4T-1 expression vector. Their optimal conditions for the fusion protein expression and purification were screened. Lysozyme gene amplified with primers ACLyz BamHI and ACLyz XhoI was ligated into the pGEX 4T-1 vector, which contained the glutathione S-transferase(GST) gene for fusion partner. The fusion protein was induced by IPTG and identified by SDS-PAGE analysis. Molecular weight of the fusion protein was estimated to be about 45 kDa. Recombinant lysozyme, fused to GST, was purified by glutathion-Sepharose 4B affinity chromatography. Western blot analysis of this protein revealed an immunoreactivity with the anti-Agrius lysozyme.

Keywords

References

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