For IRES trans-acting factors, it is all about location.

Oncogene

Apoptosis Research Centre, Children's Hospital of Eastern Ontario Research Institute, Ottawa, Ontario, Canada.

Published: February 2008

The translation of many proteins involved in transcription, cell cycle progression, apoptosis and cell survival is mediated by internal ribosome entry sites (IRESs) present within the 5'-untranslated regions (5'-UTRs) of their messenger RNA molecules (mRNAs). Several recent reports now demonstrate that the proteins controlling IRES-dependent translation initiation are regulated by their subcellular localization.

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Source
http://dx.doi.org/10.1038/sj.onc.1210777DOI Listing

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