期刊
JOURNAL OF MOLECULAR BIOLOGY
卷 396, 期 4, 页码 893-907出版社
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jmb.2009.12.013
关键词
hydrogenase; O-2 tolerance; biohydrogen production; structure
资金
- Diamond Light Source
- European Community [FP7/2007-2013]
- Fundacao para a Ciencia e Tecnologia (Ministerio da Ciencia, Tecnologia e Ensino Superior, Lisboa, Portugal) [226716]
- Ministerio de Ciencia e Innovacion (Madrid, Spain) [PTDCBIA-PRO/70429/2006, CTQ2006-12097]
- Conselho de Reitores das Universidades Portuguesas
- Ministerio de Educacio y Ciencia through a Luso-Spanish Joint Action
Hydrogen is a good energy vector, and its production from renewable sources is a requirement for its widespread use. [NiFeSe] hydrogenases, (Hases) are attractive candidates for the biological production of hydrogen because they are capable of high production rates even in the presence of moderate amounts of O-2, lessening the requirements for anaerobic conditions. The three-dimensional structure of the [NiFeSe] Hase from Desulfovibrio vulgaris Hildenborough has been determined in its oxidised as-isolated form at 2.04-angstrom resolution. Remarkably, this is the first structure of an oxidised Hase of the [NiFe] fan-Lily that does not contain an oxide bridging ligand at the active site. Instead, an extra sulfur atom is observed binding Ni and Se, leading to a SeCys conformation that shields the NiFe site from contact with oxygen. This structure provides several insights that may explain the fast activation and O-2 tolerance of these enzymes. (C) 2009 Elsevier Ltd. All rights reserved.
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