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Anderluh, G; Pungercar, J; Krizaj, I; Strukelj, B; Gubensek, F; Macek, P
Protein engineering, 07/1997, Letnik: 10, Številka: 7Journal Article
The role of the N-terminal segment 1-33 of equinatoxin II, a 20 kDa pore-forming protein from the sea anemone Actinia equina, was studied by N-truncation mutagenesis. A part of this segment was classified as being amphiphilic and membrane seeking. Wild-type equinatoxin II and its mutants lacking 5, 10 and 33 amino acid residues, respectively, were produced in Escherichia coli using T7 RNA polymerase-based expression vector. Soluble recombinant proteins were isolated from bacterial lysates and assayed for their inhibition by sphingomyelin, binding to red blood cells and hemolytic activity. The N-terminal deletion of 33 amino acids resulted in an insoluble protein, while mutants lacking 5 and 10 residues expressed increased relative avidity for sphingomyelin and red blood cell membranes. Their specific hemolytic activity was decreased, however, with increasing truncation. The results suggest that the N-terminus, which has been found to be conserved in sea anemone pore-forming toxins, contributes to the solubility of the equinatoxin II, but it is not essential for binding to lipid membranes. It is very likely that the N-terminus play a role in the formation of functional pores.
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