A new strategy to make an artificial enzyme: Photosystem II around nanosized manganese oxide

Mohammad Mahdi Najafpour, Sepideh Madadkhani, Somayyeh Akbarian, Małgorzata Hołyńska, Mohsen Kompany-Zareh, Tatsuya Tomo, Jitendra Pal Singh, Keun Hwa Chae, Suleyman Allakhverdiev

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Abstract

Herein we report a new strategy to disperse Mn oxide into the apoenzyme of photosystem II. The compound was characterized by scanning electron microscopy, transmission electron microscopy, UV-visible spectroscopy, Fourier transform infrared spectroscopy, X-ray absorption near edge structure, extended X-ray absorption fine structure, X-ray diffraction and some electrochemical methods. Under electrochemical conditions, the peaks attributed to Mn(ii)/(iii), Mn(iii)/(iv) and Mn(ii)/(iv) were assigned and compared with other manganese oxides. Linear sweep voltammetry shows that water electro-oxidation occurs at 80 mV less than that for the apoenzyme of photosystem II. Thus, Mn oxide maintains its water-oxidizing activity under these conditions. The compound is a new type of structural and functional model for the water-oxidizing complex in photosystem II.

Original languageEnglish
Pages (from-to)4451-4461
Number of pages11
JournalCatalysis Science and Technology
Volume7
Issue number19
DOIs
Publication statusPublished - Jan 1 2017
Externally publishedYes

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ASJC Scopus subject areas

  • Catalysis

Cite this

Najafpour, M. M., Madadkhani, S., Akbarian, S., Hołyńska, M., Kompany-Zareh, M., Tomo, T., Singh, J. P., Chae, K. H., & Allakhverdiev, S. (2017). A new strategy to make an artificial enzyme: Photosystem II around nanosized manganese oxide. Catalysis Science and Technology, 7(19), 4451-4461. https://doi.org/10.1039/c7cy01654a