Journal
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 2, Issue 19, Pages 2448-2452Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jz201172y
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Funding
- Ministry of Education, Culture, Sports, Science and Technology [21370063, 23108706, 23657099, 21570038, 22370017, 23370014]
- JST
- Grants-in-Aid for Scientific Research [22370017, 21570038, 21370063, 23657099, 23370014] Funding Source: KAKEN
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Photosystem II (PSII) is an enzyme that performs efficient light-driven water oxidation to provide electrons necessary for CO2 fixation in photosynthesis. In this study, we have for the first time generated PSII-gold nanoparticle (GNP) conjugates dispersed in a solution aiming at applications in artificial photosynthesis. PSII core complexes from the thermophilic cyanobacteriurn Thermosynechococcus elongatus, in which a His-tag was introduced into the C-terminus of CP47, were immobilized on GNPs with a 20 nrn diameter via nickel-nitrilotriacetic acid, orienting the electron acceptor side to the gold surface. Optical analysis showed that four to five PSII dimers are bound to a single GNP, which was confirmed by transmission electron microscopy. The PSII immobilized on GNP retained O-2 evolution activity comparable to that of free PSII. The PSII-GNP conjugate will be a useful nanodevice for the development of artificial systems for light-driven water splitting into O-2 and H-2. SECTION: Biophysical Chemistry
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