A tin-doped indium oxide electrode was shown to serve as a suitable support for a carbon nanotube – silicate composite matrix with encapsulated extracellular laccase from Cerrena unicolor. The mediator capable to shuttle electrons between electrode and protein was adsorbed 2,2’-azino-bis(3-ethylbenzothiazoline-6-sulfonate) from aqueous solution. In deareated solution this electrode exhibits peak shaped voltammetric signal corresponding to the one-electron electrooxidation -reduction process of the surface confined mediator. In dioxygen saturated solution bioelectrocatalytic dioxygen reduction is observed with this electrode.

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