Robin 2011 J Bacteriol

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Robin S, Arese M, Forte E, Sarti P, Giuffrè A, Soulimane T (2011) A sulfite respiration pathway from Thermus thermophilus and the key role of newly identified cytochrome c550. J Bacteriol 193:3988-97.

Β» PMID: 21665981 Open Access

Robin S, Arese M, Forte E, Sarti P, Giuffre A, Soulimane T (2011) J Bacteriol

Abstract: Sulfite, produced for instance during amino acid metabolism, is a very reactive and toxic compound. Various detoxification mechanisms exist, but sulfite oxidoreductases (SORs) are one of the major actors in sulfite remediation in bacteria and animals. Here we describe the existence of an operon in the extreme thermophilic bacterium Thermus thermophilus HB8 encoding both a SOR and a diheme c-type cytochrome. The in vitro analysis clearly showed that the newly identified cytochrome cβ‚…β‚…β‚€ acts as an acceptor of the electrons generated by the SOR enzyme during the oxidation of sulfite. The electrons are then rapidly shuttled via cytochrome cβ‚…β‚…β‚‚ to the terminal ba₃- and caa₃-type oxidases, thereby unveiling a novel electron transfer pathway, linking sulfite oxidation to oxygen reduction in T. thermophilus: sulfite β†’ SOR(HB8) β†’ cytochrome cβ‚…β‚…β‚€ β†’ cytochrome cβ‚…β‚…β‚‚ β†’ ba₃ oxidase/caa₃ oxidase β†’ Oβ‚‚. The description of the complete pathway reveals that electrons generated during sulfite oxidation by the SOR are funneled into the respiratory chain, participating in the energy production of T. thermophilus. β€’ Keywords: Sulfite oxidoreductase, Thermus thermophilus

β€’ O2k-Network Lab: IT Rome Sarti P


Organism: Eubacteria 

Enzyme: Complex IV;cytochrome c oxidase 

HRR: Oxygraph-2k 

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