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Heat Shock Proteome of Agrobacterium tumefaciens: Evidence for New Control Systems

Department of Molecular Microbiology and Biotechnology, George S. Wise Faculty of Life Sciences, Tel Aviv University, Ramat Aviv, Israel,¹ Institut für Mikrobiologie und Molekularbiologie, Ernst-Moritz-Arndt-Universitat-Greifswald, D-17487 Greifswald, Germany,² HSP Research Institute, Kyoto Research Park, Shimogyo-ku, Kyoto 600-8813, Japan³

Received 28 September 2001/ Accepted 20 December 2001

The regulation of Agrobacterium tumefaciens heat shock genes involves a transcriptional activator (RpoH) and repressor elements (HrcA-CIRCE). Using proteome analysis and mutants in these control elements, we show that the heat shock induction of 32 (out of 56) heat shock proteins is independent of RpoH and HrcA. These results indicate the existence of additional regulatory factors in the A. tumefaciens heat shock response.

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