Abstract
Carboxydothermus hydrogenoformans is a model microorganism for the study of [NiFe]–CODH, a key enzyme of carbon cycle in anaerobic microorganisms. The enzyme possesses a unique active site (C-cluster), constituted of a distorted [NiFe3S4] cubane linked to a mononuclear Fe(II) center. Both the biogenesis of the C-cluster and the activation of CODH by nickel insertion remain unclear. Among the three accessory proteins thought to play a role in this latter step (CooC, CooJ, and CooT), CooT is identified as a nickel chaperone involved in CODH maturation in Rhodospirillum rubrum. Here, we structurally and biophysically characterized a putative CooT protein present in C. hydrogenoformans (pChCooT). Despite the low sequence homologies between CooT from R. rubrum (RrCooT) and pChCooT (19% sequence identity), the two proteins share several similarities, such as their overall structure and a solvent-exposed Ni(II)-binding site at the dimer interface. Moreover, the X-ray structure of pChCooT reveals the proximity between the histidine 55, a potential nickel-coordinating residue, and the cysteine 2, a highly conserved key residue in Ni(II)-binding.
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Acknowledgements
This work was supported by “the ITERLIS PhD program, CEA Life sciences” for MA’s PhD funding, the “FUNBIOCO” project (IDEX-UGA, Initiatives de Recherche stratégiques) and the “COSYNBIO” project (Projets exploratoires, Cellule energie-CNRS). This work has been partially supported by the Labex ARCANE (ANR-11-LABX-0003-01). The research leading to these results has also received funding from the European Community (iNEXT support, Project ID no. 2310). We thank the High Throughput Crystallization Laboratory (HTX Lab) at the EMBL Grenoble for pChCooT crystallization. We thank the staffs from the BM-30A beamline of the European Synchrotron Facility in Grenoble. We thank Dr. Luca Signor (IBS, Grenoble) for mass spectrometry experiments in denaturing conditions (Integrated Structural Biology Grenoble platform).
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Alfano, M., Pérard, J., Miras, R. et al. Biophysical and structural characterization of the putative nickel chaperone CooT from Carboxydothermus hydrogenoformans. J Biol Inorg Chem 23, 809–817 (2018). https://doi.org/10.1007/s00775-018-1576-2
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DOI: https://doi.org/10.1007/s00775-018-1576-2