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Monomeric Hsp27 acts as a capping protein for actin, limiting filament growth. It is phosphorylated by several mechanisms, and the phosphorylated dimer is the active molecule in chaperone activity, being involved in the renaturation of damaged proteins, and in targeting denatured proteins to the proteasome. Dimers may also be generated by the phosphorylation of Hsp27 oligomers.
