Conroy DJ, Millner PA, Stewart DI, Pollmann K. Biosensing for the environment and defence: aqueous uranyl detection using bacterial surface layer proteins.
Sensors (Basel) 2010;
10:4739-55. [PMID:
22399904 PMCID:
PMC3292144 DOI:
10.3390/s100504739]
[Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/05/2010] [Revised: 04/22/2010] [Accepted: 04/27/2010] [Indexed: 11/24/2022]
Abstract
The fabrication of novel uranyl (UO(2)(2+)) binding protein based sensors is reported. The new biosensor responds to picomolar levels of aqueous uranyl ions within minutes using Lysinibacillus sphaericus JG-A12 S-layer protein tethered to gold electrodes. In comparison to traditional self assembled monolayer based biosensors the porous bioconjugated layer gave greater stability, longer electrode life span and a denser protein layer. Biosensors responded specifically to UO(2)(2+) ions and showed minor interference from Ni(2+), Cs(+), Cd(2+) and Co(2+). Chemical modification of JG-A12 protein phosphate and carboxyl groups prevented UO(2)(2+) binding, showing that both moieties are involved in the recognition to UO(2)(2+).
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