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J Biol Chem, Vol. 274, Issue 27, 18947-18956, July 2, 1999

Regulation of Hsp27 Oligomerization, Chaperone Function, and Protective Activity against Oxidative Stress/Tumor Necrosis Factor alpha  by Phosphorylation

Thorsten RogallaDagger , Monika Ehrnsperger§, Xavier Preville, Alexey Kotlyarovparallel , Gudrun LutschDagger , Cécile Ducasse, Catherine Paul, Martin WieskeDagger , André-Patrick Arrigo, Johannes Buchner§, and Matthias GaestelDagger parallel

From the Dagger  Max-Delbrück-Centrum für Molecule Medizin, Robert-Rössle-Str. 10, D-13122 Berlin, Germany, the § Institut für Biophysik und Physikalische Biochemie, Universität Regensburg, D-93040 Regensburg, Germany, the  Laboratoire du Stress Cellulaire, Centre de Génétique Moléculaire et Cellulaire, CNRS-UMR-5534, Université Claude Bernard Lyon-I, F-69622 Villeurbanne, France, and the parallel  Martin-Luther-Universität Halle-Wittenberg, Innovationskolleg Zellspezialisierung, Hoher Weg 8, D-06120 Halle, Germany

The small heat shock proteins (sHsps) from human (Hsp27) and mouse (Hsp25) form large oligomers which can act as molecular chaperones in vitro and protect cells from heat shock and oxidative stress when overexpressed. In addition, mammalian sHsps are rapidly phosphorylated by MAPKAP kinase 2/3 at two or three serine residues in response to various extracellular stresses. Here we analyze the effect of sHsp phosphorylation on its quaternary structure, chaperone function, and protection against oxidative stress. We show that in vitro phosphorylation of recombinant sHsp as well as molecular mimicry of Hsp27 phosphorylation lead to a significant decrease of the oligomeric size. We demonstrate that both phosphorylated sHsps and the triple mutant Hsp27-S15D,S78D,S82D show significantly decreased abilities to act as molecular chaperones suppressing thermal denaturation and facilitating refolding of citrate synthase in vitro. In parallel, Hsp27 and its mutants were analyzed for their ability to confer resistance against oxidative stress when overexpressed in L929 and 13.S.1.24 cells. While wild type Hsp27 confers resistance, the triple mutant S15D,S78D,S82D cannot protect against oxidative stress effectively. These data indicate that large oligomers of sHsps are necessary for chaperone action and resistance against oxidative stress whereas phosphorylation down-regulates these activities by dissociation of sHsp complexes to tetramers.


Copyright © 1999 by The American Society for Biochemistry and Molecular Biology, Inc.



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