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Refining the minimal sequence required for ERK1/2-dependent poly-ubiquitination and proteasome-dependent turnover of BIM.

Abstract：

:The pro-apoptotic protein BIM(EL) is phosphorylated by ERK1/2 and this targets the protein for poly-ubiquitination and degradation by the proteasome as a survival mechanism. To define in greater detail the sequence determinants required for BIM(EL) turnover we have compared various BIM splice variants and truncation mutants. Of the naturally occurring splice variants BIMbeta1, which lacks the C-terminal hydrophobic domain, the BH3 domain and is cytosolic, exhibited the fastest turnover rate. Indeed, neither the C-terminus, the BH3 domain nor the DLC1 binding region was required for poly-ubiquitination and turnover of BIM. However, we demonstrate that a region consisting of the ERK1/2 docking domain, ERK1/2 phosphorylation sites and either of the two potential ubiquitin-acceptor lysine residues is sufficient to allow poly-ubiquitination and turnover of BIM. In the process we demonstrate that the C-terminal hydrophobic domain, previously suggested to be important in membrane localisation, is as important as the BH3 domain for BIM to induce cell death; similarly, the pro-death BH3-domain can also confer correct mitochondrial localisation in the absence of the C-terminus. These results refine the minimal sequence for ERK1/2-driven degradation and further define the functional importance of key regions within BIM(EL), highlighting the complexity of this pro-apoptotic protein.

journal_name

Cell Signal

journal_title

Cellular signalling

authors

Wiggins CM,Johnson M,Cook SJ

doi

10.1016/j.cellsig.2010.01.004

subject

Has Abstract

pub_date

2010-05-01 00:00:00

pages

801-8

issue

5

eissn

0898-6568

issn

1873-3913

pii

S0898-6568(10)00010-0

journal_volume

22

pub_type

杂志文章

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