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

Title
A new strategy to make an artificial enzyme: photosystem II around nanosized manganese oxide
Authors
채근화Jitendra Pal SinghMohammad Mahdi NajafpourSepideh MadadkhaniSomayyeh AkbarianMatgorzata HotynskaMohsen Kompany-ZarehTatsuya TomoSuleyman I. Allakhverdiev
Keywords
artificial enzyme; photosystem; manganese oxide; X-ray absorption near edge structure; extended X-ray absorption fine structure; water electro-oxidation
Issue Date
2017-10
Publisher
Catalysis Science & Technology
Citation
VOL 7-4461
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 MnIJII)/(III), MnIJIII)/(IV) and MnIJII)/(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 wateroxidizing complex in photosystem II.
URI
http://pubs.kist.re.kr/handle/201004/66250
ISSN
2044-4753
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KIST Publication > Article
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