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Journal of Bacteriology, May 2000, p. 2985-2988, Vol. 182, No. 10
0021-9193/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

Sulfolobicins, Specific Proteinaceous Toxins Produced by Strains of the Extremely Thermophilic Archaeal Genus Sulfolobus

David Prangishvili,1,* Ingelore Holz,1 Evelyn Stieger,1 Stephan Nickell,1 Jakob K. Kristjansson,2 and Wolfram Zillig1

Max-Plank Institute für Biochemie, 82152 Martinsried, Germany,1 and Technological Institute of Iceland, Keldnaholt IS 112, Reykjavik, Iceland2

Received 16 September 1999/Accepted 21 February 2000

Several novel strains of "Sulfolobus islandicus" produced proteinaceous toxins, termed sulfolobicins, which killed cells of other strains of the same species, as well as of Sulfolobus solfataricus P1 and Sulfolobus shibatae B12, but not of the producer strains and of Sulfolobus acidocaldarius DSM639. The sulfolobicin purified from the strain HEN2/2 had a molecular mass of about 20 kDa. It was found to be associated with the producer cells as well as with cell-derived S-layer-coated spherical membrane vesicles 90 to 180 nm in diameter and was not released from the cells in soluble form.

* Corresponding author. Present address: Department of Microbiology, University of Regensburg, Universitätsstr. 31, 93053 Regensburg, Germany. Phone: 49-941-94 33 178. Fax: 49-941-94 32 403. E-mail: david.prangishvili{at}biologie.uni-r.de.

Journal of Bacteriology, May 2000, p. 2985-2988, Vol. 182, No. 10
0021-9193/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.


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