Photoautotrophic hydrogen production by eukaryotic microalgae under aerobic conditions

Jae-Hoon Hwang, Hyun-Chul Kim, Jeong-A Choi, R.A.I. Abou-Shanab, Brian A. Dempsey, John M Regan, Jung Rae Kim, Hocheol Song, In-Hyun Nam, Su-Nam Kim, Woojung Lee, Donghee Park, Yongje Kim, Jaeyoung Choi, Min-Kyu Ji, Woosik Jung and Byong-Hun Jeon ()
Additional contact information
Jae-Hoon Hwang: Institute of Convergence Science, Yonsei University
Hyun-Chul Kim: Institute of Convergence Science, Yonsei University
Jeong-A Choi: Institute of Convergence Science, Yonsei University
R.A.I. Abou-Shanab: Institute of Convergence Science, Yonsei University
Brian A. Dempsey: Pennsylvania State University, 212 Sackett Building
John M Regan: Pennsylvania State University, 212 Sackett Building
Jung Rae Kim: School of Chemical and Biomolecular Engineering, Pusan National University
Hocheol Song: Sejong University
In-Hyun Nam: Korea Institute of Geoscience and Mineral Resources (KIGAM)
Su-Nam Kim: Korea Institute of Science and Technology (KIST), Gangneung Institute
Woojung Lee: Korea Institute of Science and Technology (KIST), Gangneung Institute
Donghee Park: Institute of Convergence Science, Yonsei University
Yongje Kim: Korea Institute of Geoscience and Mineral Resources (KIGAM)
Jaeyoung Choi: Korea Institute of Science and Technology (KIST), Gangneung Institute
Min-Kyu Ji: Institute of Convergence Science, Yonsei University
Woosik Jung: Institute of Convergence Science, Yonsei University
Byong-Hun Jeon: Institute of Convergence Science, Yonsei University

Nature Communications, 2014, vol. 5, issue 1, 1-6

Abstract: Abstract Eukaryotic algae and cyanobacteria produce hydrogen under anaerobic and limited aerobic conditions. Here we show that novel microalgal strains (Chlorella vulgaris YSL01 and YSL16) upregulate the expression of the hydrogenase gene (HYDA) and simultaneously produce hydrogen through photosynthesis, using CO2 as the sole source of carbon under aerobic conditions with continuous illumination. We employ dissolved oxygen regimes that represent natural aquatic conditions for microalgae. The experimental expression of HYDA and the specific activity of hydrogenase demonstrate that C. vulgaris YSL01 and YSL16 enzymatically produce hydrogen, even under atmospheric conditions, which was previously considered infeasible. Photoautotrophic H2 production has important implications for assessing ecological and algae-based photolysis.

Date: 2014
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DOI: 10.1038/ncomms4234

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