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Journal of Bacteriology, December 2001, p. 7392-7396, Vol. 183, No. 24
0021-9193/01/$04.00+0   DOI: 10.1128/JB.183.24.7392-7396.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.

Novel Form of ClpB/HSP100 Protein in the Cyanobacterium Synechococcus

Mats-Jerry Eriksson, Jenny Schelin, Ewa Miskiewicz,dagger and Adrian K. Clarke*

Umeå Plant Science Centre, Department of Plant Physiology, Umeå University, S-901 87 Umeå, Sweden

Received 19 June 2001/Accepted 12 September 2001

Synechococcus sp. strain PCC 7942 has a second clpB gene that encodes a 97-kDa protein with novel features. ClpBII is the first ClpB not induced by heat shock or other stresses; it is instead an essential, constitutive protein. ClpBII is unable to complement ClpBI function for acquired thermotolerance. No truncated ClpBII version is normally produced, unlike other bacterial forms, while ectopic synthesis of a putative truncated ClpBII dramatically decreased cell viability.

* Corresponding author. Present address: Botanical Institute, Göteborg University, Box 461, SE-405 30 Göteborg, Sweden. Phone: 46 31 7732502. Fax: 46 31 7732626. E-mail: Adrian.Clarke{at}botinst.gu.se.

dagger Present address: Department of Plant Sciences, University of Western Ontario, London, Ontario, Canada.

Journal of Bacteriology, December 2001, p. 7392-7396, Vol. 183, No. 24
0021-9193/01/$04.00+0   DOI: 10.1128/JB.183.24.7392-7396.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.


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