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THE PLANT CELL, Vol 9, Issue 12 2171-2181, Copyright © 1997 by American Society of Plant Biologists

RESEARCH ARTICLE

Stable Transformation of an Arabidopsis Cell Suspension Culture with Firefly Luciferase Providing a Cellular System for Analysis of Chaperone Activity in Vivo

C. Forreiter, M. Kirschner and L. Nover
Department of Molecular Cell Biology, Goethe University, Marie-Curie-Strasse 9, D-60439 Frankfurt am Main, Germany

Using Agrobacterium, we developed a method to transform an Arabidopsis cell suspension culture. A stably transformed cell line expressing high levels of firefly luciferase (Luc) was used for in vivo studies of thermal denaturation and renaturation of the enzyme and the protective role of different chaperones. Luc activity was monitored under heat stress and recovery conditions in control, thermotolerant cells and cells expressing plant chaperones after transient cotransformation with plasmids encoding proteins of the heat shock protein Hsp90, Hsp70, or Hsp20 family. The effects of the expressed proteins were specific. The Hsp17.6 class I protein maintained Luc activity on a level comparable with that observed in thermotolerant cells and improved Luc renaturation. Although transient expression of Hsp90 did not protect Luc from thermal denaturation, it accelerated Luc renaturation during recovery. In contrast to the other chaperones tested, overexpression of Hsp70 alone had no effect on denaturation and renaturation of Luc but enhanced Luc renaturation if coexpressed with Hsp17.6.


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