International Journal Of Bilogical Sciences

Photoactivation Studies of Zinc Porphyrin-Myoglobin System and Its Application for Light-Chemical Energy Conversion

Chin-Hao Chang1, Yi-Ting Hu1, Chen-Fu Lo2, Liyang Luo3, Hung-Ming Lin1, Cheng-Hsiang Chang1, Ching-Yao Lin2✉, Eric Wei-Guang Diau3✉, Tung-Kung Wu1✉

Abstarc :

An artificial zinc porphyrin-myoglobin-based photo-chemical energy conversion system, consisting of ZnPP-Mb or ZnPE1-Mb as a photosensitizer, NADP+ as an electron acceptor, and triethanolamine as an electron donor, has been constructed to mimic photosystem I. The photoirradiated product is able to reduce a single-electron acceptor protein cytochrome c, but cannot catalyze the two-electron reduction of acetaldehyde by alcohol dehydrogenase, thus demonstrating a single electron transfer mechanism. Furthermore, the artificial system can bifunctionally promote oxidoredox reactions, depending on the presence or absence of a sacrificial electron donor, thus suggesting its potential application in electrochemical regeneration steps involved in chemical transformation and/or energy conversion.

Key Word :
photoelectrochemical energy conversion, zinc protoporphyrin, myoglobin, oxidoredox reaction, biosensitizer

Volume 7, Number 8, - 2011 , ISSN 1545-1003