Abstract
The orange protein (ORP) isolated from the sulfate-reducing bacterium Desulfovibrio gigas (11.8 kDa) contains a mixed-metal sulfide cluster of the type [S2MoS2CuS2MoS2]3- noncovalently bound to the polypeptide chain. The D. gigas ORP was heterologously produced in Escherichia coli in the apo form. Different strategies were used to reconstitute the metal cluster into apo-ORP and obtain insights into the metal cluster synthesis: (1) incorporation of a synthesized inorganic analogue of the native metal cluster and (2) the in situ synthesis of the metal cluster on the addition to apo-ORP of copper chloride and tetrathiomolybdate or tetrathiotungstate. This latter procedure was successful, and the visible spectrum of the Mo–Cu reconstituted ORP is identical to the one reported for the native protein with absorption maxima at 340 and 480 nm. The 1H–15N heteronuclear single quantum coherence spectra of the reconstituted ORP obtained by strategy 2, in contrast to strategy 1, exhibited large changes, which required sequential assignment in order to identify, by chemical shift differences, the residues affected by the incorporation of the cluster, which is stabilized inside the protein by both electrostatic and hydrophobic interactions.
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Acknowledgments
We thank Fundação para a Ciência e a Tecnologia (FCT) for financial support (projects PTDC/QUI-BIQ/098071/2008 and FCT-ANR/BBB-MET/0023/2012). We acknowledge LabRMN at FCT-UNL and Rede Nacional de RMN for access to the facilities. The NMR spectrometers are part of the National NMR Facility, supported by FCT, Projecto de Re-Equipamento Científico, Portugal, and RECI/BBB-BQB/0230/2012. This work was financed by national funds from FCT under project PEst-C/EQB/LA0006/2013.
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This article is dedicated to the memory of Professor Ivano Bertini.
Responsible Editors: Lucia Banci and Claudio Luchinat.
M. S. P. Carepo and S. R. Pauleta contributed equally to this article.
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Carepo, M.S.P., Pauleta, S.R., Wedd, A.G. et al. Mo–Cu metal cluster formation and binding in an orange protein isolated from Desulfovibrio gigas . J Biol Inorg Chem 19, 605–614 (2014). https://doi.org/10.1007/s00775-014-1107-8
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DOI: https://doi.org/10.1007/s00775-014-1107-8