Structural and functional investigations of biological catalysts for optimization of solar-driven, H2 production systems

Paul W. King, Drazenka Svedruzic, Jordi Cohen, Klaus Schulten, Michael Seibert, Maria L. Ghirardi

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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 iror - 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.

Original languageEnglish (US)
Title of host publicationSolar Hydrogen and Nanotechnology
DOIs
StatePublished - Dec 1 2006
EventSolar Hydrogen and Nanotechnology - San Diego, CA, United States
Duration: Aug 14 2006Aug 17 2006

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume6340
ISSN (Print)0277-786X

Other

OtherSolar Hydrogen and Nanotechnology
CountryUnited States
CitySan Diego, CA
Period8/14/068/17/06

Keywords

  • [FeFe] hydrogenase
  • Protein engineering
  • Recombinant expression

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Condensed Matter Physics

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