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Journal of Bacteriology, October 2004, p. 6667-6670, Vol. 186, No. 19
0021-9193/04/$08.00+0     DOI: 10.1128/JB.186.19.6667-6670.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.

Channel-Forming (Porin) Activity in Herpetosiphon aurantiacus Hp a2

Rainer Harwardt,1 Elke Maier,2 Hans Reichenbach,3 Jürgen Weckesser,1 and Roland Benz2*

Institut für Biologie II, Mikrobiologie, Albert-Ludwigs-Universität, Freiburg,1 Lehrstuhl für Biotechnologie, Biozentrum der Universität Würzburg, Würzburg,2 Gesellschaft für Biotechnologische Forschung mbH, Braunschweig, Germany3

Received 20 April 2004/ Accepted 9 July 2004

Detergent extracts of cell envelopes of the gliding bacterium Herpetosiphon aurantiacus formed channels in lipid bilayers. Fast protein liquid chromatography across a HiTrap-Q cation-exchange column demonstrated that a 45-kDa protein forms the channel. The observation of a channel-forming protein suggests that Herpetosiphon aurantiacus Hp a2 has a permeability barrier on its surface.

* Corresponding author. Mailing address: Lehrstuhl für Biotechnologie, Biozentrum der Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany. Phone: 49-931-888-4501. Fax: 49-931-888-4509. E-mail: roland.benz{at}mail.uni-wuerzburg.de.

Journal of Bacteriology, October 2004, p. 6667-6670, Vol. 186, No. 19
0021-9193/04/$08.00+0     DOI: 10.1128/JB.186.19.6667-6670.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.





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