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- W2007687005 abstract "Bim, a BH3-only protein, is expressed de novo following withdrawal of serum survival factors and promotes cell death. We have shown previously that activation of the ERK1/2 pathway promotes phosphorylation of Bim(EL), targeting it for degradation via the proteasome. However, the nature of the kinase responsible for Bim(EL) phosphorylation remained unclear. We now show that Bim(EL) is phosphorylated on at least three sites in response to activation of the ERK1/2 pathway. By using the peptidylprolyl isomerase, Pin1, as a probe for proline-directed phosphorylation, we show that ERK1/2-dependent phosphorylation of Bim(EL) occurs at (S/T)P motifs. ERK1/2 phosphorylates Bim(EL), but not Bim(S) or Bim(L), in vitro, and mutation of Ser(65) to alanine blocks the phosphorylation of Bim(EL) by ERK1/2 in vitro and in vivo and prevents the degradation of the protein following activation of the ERK1/2 pathway. We also find that ERK1/2, but not JNK, can physically associate with GST-Bim(EL), but not GST-Bim(L) or GST-Bim(S), in vitro. ERK1/2 also binds to full-length Bim(EL) in vivo, and we have localized a potential ERK1/2 docking domain lying within a 27-amino acid stretch of the Bim(EL) protein. Our findings provide new insights into the post-translational regulation of Bim(EL) and the role of the ERK1/2 pathway in cell survival signaling." @default.
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- W2007687005 date "2004-03-01" @default.
- W2007687005 modified "2023-09-26" @default.
- W2007687005 title "Extracellular Signal-regulated Kinases 1/2 Are Serum-stimulated “BimEL Kinases” That Bind to the BH3-only Protein BimEL Causing Its Phosphorylation and Turnover" @default.
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- W2007687005 doi "https://doi.org/10.1074/jbc.m311578200" @default.
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