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Enhanced metalloadsorption of bacterial cells displaying poly-His peptides

Abstract

The properties of Escherichia coli cells, acquired by cell surface presentation of one or two hexa-histidine (His) clusters carried by the outer membrane LamB protein, have been examined. Strains producing LamB hybrids with the His chains accumulated greater than 11-fold more Cd2+ than E. coli cells expressing the protein without the His insert. Furthermore, the hexa-His chains on the cell surface caused cells to adhere reversibly to a Ni2+-containing solid matrix in a metal-dependent fashion. Thus, expression of poly-His peptides enables bacteria to act as a metalloaffinity adsorbent. These results open up the possibility for biosorption of heavy ions using engineered microorganisms.

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Sousa, C., Cebolla, A. & de Lorenzo, V. Enhanced metalloadsorption of bacterial cells displaying poly-His peptides. Nat Biotechnol 14, 1017–1020 (1996). https://doi.org/10.1038/nbt0896-1017

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