Involvement of the GroE Chaperonins in the Nickel-Dependent Anaerobic Biosynthesis of NiFe-Hydrogenases of Escherichia coli - CNRS - Centre national de la recherche scientifique Accéder directement au contenu
Article Dans Une Revue Journal of Bacteriology Année : 1996

Involvement of the GroE Chaperonins in the Nickel-Dependent Anaerobic Biosynthesis of NiFe-Hydrogenases of Escherichia coli

Résumé

We analyzed the involvement of chaperonins GroES and GroEL in the biosynthesis of the three hydrogenase isoenzymes, HYD1, HYD2, and HYD3, of Escherichia coli. These hydrogenases are NiFe-containing, membranebound enzymes composed of small and large subunits, each of which is proteolytically processed during biosynthesis. Total hydrogenase activity was found to be reduced by up to 60% in groES and groEL thermosensitive mutant strains. This effect was specific because it was not seen for another oligomeric, membranebound metalloenzyme, i.e., nitrate reductase. Analyses of the single hydrogenase isoenzymes revealed that a temperature shift during the growth of groE mutants led to an absence of HYD1 activity and to an accumulation of the precursor of the large subunit of HYD3, whereas only marginal effects on the processing of HYD2 and its activity were observed under these conditions. A decrease in total hydrogenase activity, together with accumulation of the precursors of the large subunits of HYD2 and HYD3, was also found to occur in a nickel uptake mutant (nik). The phenotype of this nik mutant was suppressed by supplementation of the growth medium with nickel ions. On the contrary, Ni21 no longer restored hydrogenase activity and processing of the large subunit of HYD3 when the nik and groE mutations were combined in one strain. This finding suggests the involvement of these chaperonins in the biosynthesis of a functional HYD3 isoenzyme via the incorporation of nickel. In agreement with these in vivo results, we demonstrated a specific binding of GroEL to the precursor of the large subunit of HYD3 in vitro. Collectively, our results are consistent with chaperonin-dependent incorporation of nickel into the precursor of the large subunit of HYD3 as a prerequisite of its proteolytic processing and the acquisition of enzymatic activity.
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Dates et versions

hal-01667592 , version 1 (19-12-2017)

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  • HAL Id : hal-01667592 , version 1

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Agnès Rodrigue, Nathalie Batia, Matthias Müller, Olivier Fayet, Robert Böhm, et al.. Involvement of the GroE Chaperonins in the Nickel-Dependent Anaerobic Biosynthesis of NiFe-Hydrogenases of Escherichia coli. Journal of Bacteriology, 1996, 178, pp.4453 - 4460. ⟨hal-01667592⟩
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