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  How [Fe]-Hydrogenase from Methanothermobacter is Protected Against Light and Oxidative Stress

Wagner, T., Huang, G., Ermler, U., & Shima, S. (2018). How [Fe]-Hydrogenase from Methanothermobacter is Protected Against Light and Oxidative Stress. Angewandte Chemie International Edition in English, 57(46), 15056-15059. doi:10.1002/anie.201807203.

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 Creators:
Wagner , Tristan1, Author
Huang, Gangfeng1, Author
Ermler, Ulrich2, Author                 
Shima, Seigo1, Author
Affiliations:
1Max Planck Institute for Terrestrial Microbiology, Marburg, Germany, Karl-von-Frisch Straße 10, 35043 Marburg, Germany, ou_persistent22              
2Department of Molecular Membrane Biology, Max Planck Institute of Biophysics, Max Planck Society, ou_2068290              

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Free keywords: FeGP cofactor; [Fe]-hydrogenase; environmental stresses; enzymes; protein structures
 Abstract: [Fe]‐hydrogenase (Hmd) catalyzes the reversible hydrogenation of methenyltetrahydromethanopterin (methenyl‐H4MPT+) with H2. Hmd contains the iron–guanylylpyridinol (FeGP) cofactor, which is sensitive to light and oxidative stress. A natural protection mechanism is reported for Hmd based on structural and biophysical data. Hmd from Methanothermobacter marburgensis (mHmd) was found in a hexameric state, where an expanded oligomerization loop is detached from the dimer core and intrudes into the active site of a neighboring dimer. An aspartic acid residue from the loop ligates to FeII of the FeGP cofactor and thus blocks the postulated H2‐binding site. In solution, this enzyme is in a hexamer‐to‐dimer equilibrium. Lower enzyme concentrations, and the presence of methenyl‐H4MPT+, shift the equilibrium toward the active dimer side. At higher enzyme concentrations—as present in the cell—the enzyme is predominantly in the inactive hexameric state and is thereby protected against light and oxidative stress.

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Language(s): eng - English
 Dates: 2018-08-242018-06-222018-09-122018-10-192018-11-12
 Publication Status: Issued
 Pages: 4
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1002/anie.201807203
 Degree: -

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Title: Angewandte Chemie International Edition in English
  Abbreviation : Angew. Chem. Int. Ed. Engl.
Source Genre: Journal
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Publ. Info: Weinheim : Wiley-VCH
Pages: - Volume / Issue: 57 (46) Sequence Number: - Start / End Page: 15056 - 15059 Identifier: ISSN: 0570-0833
CoNE: https://pure.mpg.de/cone/journals/resource/0570-0833