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Journal of Bacteriology, January 2002, p. 313-317, Vol. 184, No. 1
0021-9193/01/$04.00+0     DOI: 10.1128/JB.184.1.313-317.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.

The High-Molecular-Weight Cytochrome c Cyc2 of Acidithiobacillus ferrooxidans Is an Outer Membrane Protein

Andrés Yarzábal,1 Gaël Brasseur,2 Jeanine Ratouchniak,1 Karen Lund,1 Danielle Lemesle-Meunier,2 John A. DeMoss,1 and Violaine Bonnefoy1*

Laboratoire de Chimie Bactérienne,1 Laboratoire de Bioénergétique et Ingénierie des Protéines, CNRS, IBSM, Marseille, France2

Received 26 June 2001/ Accepted 3 October 2001

A high-molecular-weight c-type cytochrome, Cyc2, and a putative 22-kDa c-type cytochrome were detected in the membrane fraction released during spheroplast formation from Acidithiobacillus ferrooxidans. This fraction was enriched in outer membrane components and devoid of cytoplasmic membrane markers. The genetics, as well as the subcellular localization of Cyc2 at the outer membrane level, therefore make it a prime candidate for the initial electron acceptor in the respiratory pathway between ferrous iron and oxygen.

* Corresponding author. Mailing address: Laboratoire de Chimie Bactérienne, CNRS, IBSM, 31 Chemin J. Aiguier, 13402 Marseille Cedex 20, France. Phone: 33 (0)4-91-16-41-46. Fax: 33 (0)4-91-71-89-14. E-mail: bonnefoy{at}ibsm.cnrs-mrs.fr.

Journal of Bacteriology, January 2002, p. 313-317, Vol. 184, No. 1
0021-9193/01/$04.00+0     DOI: 10.1128/JB.184.1.313-317.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.



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