Dual role of HupF in the biosynthesis of [NiFe] hydrogenase in Rhizobium leguminosarum

Albareda Contreras, Marta and Manyani, Hamid and Imperial Ródenas, Juan and Brito Lopez, Maria Belen and Ruiz Argüeso, Tomas-Andres and Böck, August and Palacios Alberti, Jose Manuel (2012). Dual role of HupF in the biosynthesis of [NiFe] hydrogenase in Rhizobium leguminosarum. "Bmc Microbiology", v. 12 ; pp. 256-268. ISSN 1471-2180. https://doi.org/10.1186/1471-2180-12-256.

Description

Title: Dual role of HupF in the biosynthesis of [NiFe] hydrogenase in Rhizobium leguminosarum
Author/s:
  • Albareda Contreras, Marta
  • Manyani, Hamid
  • Imperial Ródenas, Juan
  • Brito Lopez, Maria Belen
  • Ruiz Argüeso, Tomas-Andres
  • Böck, August
  • Palacios Alberti, Jose Manuel
Item Type: Article
Título de Revista/Publicación: Bmc Microbiology
Date: November 2012
ISSN: 1471-2180
Volume: 12
Subjects:
Faculty: E.T.S.I. Agrónomos (UPM) [antigua denominación]
Department: Biotecnologia [hasta 2014]
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

Background: [NiFe] hydrogenases are enzymes that catalyze the oxidation of hydrogen into protons and electrons, to use H2 as energy source, or the production of hydrogen through proton reduction, as an escape valve for the excess of reduction equivalents in anaerobic metabolism. Biosynthesis of [NiFe] hydrogenases is a complex process that occurs in the cytoplasm, where a number of auxiliary proteins are required to synthesize and insert the metal cofactors into the enzyme structural units. The endosymbiotic bacterium Rhizobium leguminosarum requires the products of eighteen genes (hupSLCDEFGHIJKhypABFCDEX) to synthesize an active hydrogenase. hupF and hupK genes are found only in hydrogenase clusters from bacteria expressing hydrogenase in the presence of oxygen. Results: HupF is a HypC paralogue with a similar predicted structure, except for the C-terminal domain present only in HupF. Deletion of hupF results in the inability to process the hydrogenase large subunit HupL, and also in reduced stability of this subunit when cells are exposed to high oxygen tensions. A ?hupF mutant was fully complemented for hydrogenase activity by a C-terminal deletion derivative under symbiotic, ultra low-oxygen tensions, but only partial complementation was observed in free living cells under higher oxygen tensions (1% or 3%). Co-purification experiments using StrepTag-labelled HupF derivatives and mass spectrometry analysis indicate the existence of a major complex involving HupL and HupF, and a less abundant HupF-HupK complex. Conclusions: The results indicate that HupF has a dual role during hydrogenase biosynthesis: it is required for hydrogenase large subunit processing and it also acts as a chaperone to stabilize HupL when hydrogenase is synthesized in the presence of oxygen.

More information

Item ID: 16486
DC Identifier: http://oa.upm.es/16486/
OAI Identifier: oai:oa.upm.es:16486
DOI: 10.1186/1471-2180-12-256
Official URL: http://www.biomedcentral.com/1471-2180/12/256/abstract
Deposited by: Memoria Investigacion
Deposited on: 16 Jul 2013 08:06
Last Modified: 21 Apr 2016 16:48
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