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Cytotoxicity of Recombinant Tamapin and Related Toxin-Like Peptides on Model Cell Lines

Cytotoxicity of Recombinant Tamapin and Related Toxin-Like Peptides on Model Cell Lines

Belén Ramírez-Cordero, Yanis Toledano, Patricia Cano-Sánchez, Rogelio Hernández-López, David Flores-Solis, Alma L Saucedo-Yáñez, Isabel Chávez-Uribe, Luis G Brieba, Federico del Río-Portilla

Chem Res Toxicol. 2014 Jun 16;27(6):960-7.

PMID: 24821061

Abstract:

The scorpion toxin tamapin displays the most potent and selective blockage against KCa2.2 channels known to date. In this work, we report the biosynthesis, three-dimensional structure, and cytotoxicity on cancer cell lines (Jurkat E6-1 and human mammary breast cancer MDA-MB-231) of recombinant tamapin and five related peptides bearing mutations on residues (R6A,R7A, R13A, R6A-R7A, and GS-tamapin) that were previously suggested to be important for tamapin's activity. The indicated cell lines were used as they constitutively express KCa2.2 channels. The studied toxin-like peptides displayed lethal responses on Jurkat T cells and breast cancer cells; their effect is dose- and time-dependent with IC50 values in the nanomolar range. The order of potency is r-tamapin>GS-tamapin>R6A>R13A>R6A-R7A>R7A for Jurkat T cells and r-tamapin>R7A for MDA-MB-231 breast cancer cells. Our structural determination by NMR demonstrated that r-tamapin preserves the folding of the αKTx5 subfamily and that neither single nor double alanine mutations affect the three-dimensional structure of the wild-type peptide. In contrast, our activity assays show that changes in cytotoxicity are related to the chemical nature of certain residues. Our results suggest that the toxic activity of r-tamapin on Jurkat and breast cancer cells could be mediated by the interaction of charged residues in tamapin with KCa2.2 channels via the apoptotic cell death pathway.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
IAR4245389	Tamapin			Price

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