Journal
ONCOGENE
Volume 27, Issue 8, Pages 1167-1174Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/sj.onc.1210723
Keywords
BAG-1; translation; IRES; internal ribosome entry; polypyrimidine tract binding protein
Funding
- Biotechnology and Biological Sciences Research Council [C14959, BBS/B/03556] Funding Source: Medline
- Wellcome Trust [075802] Funding Source: Medline
- Biotechnology and Biological Sciences Research Council [BBS/B/03556] Funding Source: researchfish
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There are three major isoforms of BAG-1 in mammalian cells, termed BAG-1L ( p50), BAG-1M ( p46) and BAG-1S ( p36) that function as pro-survival proteins and are associated with tumorigenesis and chemoresistance. Initiation of BAG-1 protein synthesis can occur by both cap-dependent and cap-independent mechanisms and it has been shown that synthesis of BAG-1S is dependent upon the presence of an internal ribosome entry segment ( IRES) in the 5'-UTR of BAG-1 mRNA. We have shown previously that BAG-1 IRES-meditated initiation of translation requires two trans-acting factors poly ( rC) binding protein 1 ( PCBP1) and polypyrimidine tract binding protein ( PTB) for function. The former protein allows BAG-1 IRES RNA to attain a structure that permits binding of the ribosome, while the latter protein appears to be involved in ribosome recruitment. Here, we show that the BAG-1 IRES maintains synthesis of BAG-1 protein following exposure of cells to the chemotoxic drug vincristine but not to cisplatin and that this is brought about, in part, by the relocalization of PTB and PCBP1 from the nucleus to the cytoplasm.
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