Electron transfer to a gold electrode from cytochrome oxidase in a biomembrane via a polyelectrolyte film

被引:21
作者
Lindholm-Sethson, B [1 ]
Gonzalez, JC
Puu, G
机构
[1] Umea Univ, Dept Analyt Chem, S-90187 Umea, Sweden
[2] Def Res Estab, S-90182 Umea, Sweden
关键词
D O I
10.1021/la9710278
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
We have developed an electrode modification, which permits the communication between cytochrome c in solution, cytochrome oxidase residing in its natural environment of a lipid membrane, and a gold electrode. The connection is made via an electroactive polyelectrolyte containing an osmium complex covalently attached to poly(4-vinylpyridine), sandwiched between thin layers of a negatively charged polyelectrolyte, polystyrene sulfonate. The outermost layer is the support for the oxidase-containing lipid film. Electron transfer from a pulse of reduced cytochrome c in the surrounding medium via the enzyme and the polyelectrolyte to the electrode is evident as a transient current during anaerobic conditions. Inhibiting the enzyme with sodium azide results in a temporarily decreased cytochrome c signal. The enzyme-mediated electron transport increased with increasing substrate concentration, resulting in a Michaelis-Menten constant of the same magnitude as for free or liposomal enzyme.
引用
收藏
页码:6705 / 6708
页数:4
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