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Proceedings Paper

Structural and functional investigations of biological catalysts for optimization of solar-driven H2 production systems
Author(s): Paul W. King; Drazenka Svedruzic; Jordi Cohen; Klaus Schulten; Michael Seibert; Maria L. Ghirardi
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Paper Abstract

Research efforts to develop efficient systems for H2 production encompass a variety of biological and chemical approaches. For solar-driven H2 production we are investigating an approach that integrates biological catalysts, the [FeFe] hydrogenases, with a photoelectrochemical cell as a novel bio-hybrid system. Structurally the [FeFe] hydrogenases consist of an iron-sulfur catalytic site that in some instances is electronically wired to accessory iron-sulfur clusters proposed to function in electron transfer. The inherent structural complexity of most examples of these enzymes is compensated by characteristics desired for bio-hybrid systems (i.e., low activation energy, high catalytic activity and solubility) with the benefit of utilizing abundant, less costly non-precious metals. Redesign and modification of [FeFe] hydrogenases is being undertaken to reduce complexity and to optimize structural properties for various integration strategies. The least complex examples of [FeFe] hydrogenase are found in the species of photosynthetic green algae and are being studied as design models for investigating the effects of structural minimization on substrate transfer, catalytic activity and oxygen sensitivity. Redesigning hydrogenases for effective use in bio-hybrid systems requires a detailed understanding of the relationship between structure and catalysis. To achieve better mechanistic understanding of [FeFe] hydrogenases both structural and dynamic models are being used to identify potential substrate transfer mechanisms which are tested in an experimental system. Here we report on recent progress of our investigations in the areas of [FeFe] hydrogenase overexpression, minimization and biochemical characterization.

Paper Details

Date Published: 8 September 2006
PDF: 9 pages
Proc. SPIE 6340, Solar Hydrogen and Nanotechnology, 63400Y (8 September 2006); doi: 10.1117/12.693636
Show Author Affiliations
Paul W. King, National Renewable Energy Lab. (United States)
Drazenka Svedruzic, National Renewable Energy Lab. (United States)
Jordi Cohen, Univ. of Illinois at Urbana-Champaign (United States)
Klaus Schulten, Univ. of Illinois at Urbana-Champaign (United States)
Michael Seibert, National Renewable Energy Lab. (United States)
Maria L. Ghirardi, National Renewable Energy Lab. (United States)

Published in SPIE Proceedings Vol. 6340:
Solar Hydrogen and Nanotechnology
Lionel Vayssieres, Editor(s)

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