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Doerwald L van Genesen ST Onnekink C Marín-Vinader L de Lange F de Jong WW Lubsen NH 《Cellular and molecular life sciences : CMLS》2006,63(6):735-743
The mechanism of the translational thermotolerance provided by the small heat shock proteins (sHsps) αB-crystallin or Hsp27
is unknown. We show here that Hsp27, but not αB-crystallin, increased the pool of mobile stress granule-associated enhanced
green fluorescent protein (EGFP)-eukaryotic translation initiation factor (eIF)4E in heat-shocked cells, as determined by
fluorescence recovery after photobleaching. Hsp27 also partially prevented the sharp decrease in the pool of mobile cytoplasmic
EGFP-eIF4G. sHsps did not prevent the phosphorylation of eIF2α by a heat shock, but promoted dephosphorylation during recovery.
Expression of the C-terminal fragment of GADD34, which causes constitutive dephosphorylation of eIF2α, fully compensated for
the stimulatory effect of αB-crystallin on protein synthesis in heat-shocked cells, but only partially for that of Hsp27.
Our data show that sHsps do not prevent the inhibition of protein synthesis upon heat shock, but restore translation more
rapidly by promoting the dephosphorylation of eIF2α and, in the case of Hsp27, the availability of eIF4E and eIF4G.
Received 9 December 2005; received after revision 16 January 2006; accepted 23 January 2006 相似文献