Biosensing for the environment and defence: aqueous uranyl detection using bacterial surface layer proteins.
Biosensing for the environment and defence: aqueous uranyl detection using bacterial surface layer proteins.
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DOI:
10.3390/s100504739
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发表时间:
2010
期刊:
影响因子:
--
通讯作者:
Pollmann K
中科院分区:
文献类型:
--
作者:
Conroy DJ;Millner PA;Stewart DI;Pollmann K
The fabrication of novel uranyl (UO22+) 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 UO22+ ions and showed minor interference from Ni2+, Cs+, Cd2+ and Co2+. Chemical modification of JG-A12 protein phosphate and carboxyl groups prevented UO22+ binding, showing that both moieties are involved in the recognition to UO22+.
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