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Bacillus Licheniformis CotA Laccase Mutant: ElectrocatalyticReduction of O 2 from 0.6 V (SHE) at pH 8 and in Seawater

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Enzymes operating in environmental media are of immense biotechnological interest, in particular, for sustainable energy production. Here, we show that the K316 N/D500G mutant of CotA laccase from Bacillus licheniformis operates in basic media and seawater, electrocatalyzing O 2 reduction from 0.59 V, pH 8. CotA mutant's T1Cu center exhibits a formal potential of 0.56 V, consistent with an onset of bioelectrocatalytic reduction of O 2 . A photoelectrochemical cell recycling H 2 O/O 2 by a semiconductor photoanode and CotA mutant biocathode produced 41 and 11 μW cm 2 , in buffer and seawater, respectively, at pH 8, (electricity production being limited solely by the photoanode performance, reaching 240 and 220 μW cm −2 in a Zn-biobattery design), suggesting a prospective enzyme application for clean and sustainable production of electricity from seawater and oxygen.

Original languageEnglish
Pages (from-to)2043-2049
Number of pages7
Publication statusPublished - 2019

    Research areas

  • bacterial CotA laccase, bioelectrocatalysis, oxygen reduction, photo-biovoltaics, seawater

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