TY - JOUR
T1 - A new strategy to make an artificial enzyme
T2 - Photosystem II around nanosized manganese oxide
AU - Najafpour, Mohammad Mahdi
AU - Madadkhani, Sepideh
AU - Akbarian, Somayyeh
AU - Hołyńska, Małgorzata
AU - Kompany-Zareh, Mohsen
AU - Tomo, Tatsuya
AU - Singh, Jitendra Pal
AU - Chae, Keun Hwa
AU - Allakhverdiev, Suleyman I.
N1 - Funding Information:
The authors are grateful to the Institute for Advanced Studies in Basic Sciences and the grant from Iran National Science Foundation (INSF). SIA was supported by a grant from the Russian Science Foundation (No: 14-14-00039). This study was also supported by the Grants-in-Aids for Scientific Research from JSPS (No. 24370025, 26220801, 17 K07453 to T. T.). We thank Jon Nield from Queen Mary University of London, UK for Fig. 1. We also thank the ImageJ group (W. S. Rasband, ImageJ, U. S. National Institutes of Health, Bethesda, Maryland, USA, http://imagej.nih.gov/ij/, 1997–2016) for the software to provide colored SEM or TEM images.
PY - 2017
Y1 - 2017
N2 - 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.
AB - 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.
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U2 - 10.1039/c7cy01654a
DO - 10.1039/c7cy01654a
M3 - Article
AN - SCOPUS:85030661117
VL - 7
SP - 4451
EP - 4461
JO - Catalysis Science and Technology
JF - Catalysis Science and Technology
SN - 2044-4753
IS - 19
ER -