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Proc Natl Acad Sci U S A. 1989 Aug;86(15):5795-9.

Translation of glucose-regulated protein 78/immunoglobulin heavy-chain binding protein mRNA is increased in poliovirus-infected cells at a time when cap-dependent translation of cellular mRNAs is inhibited.

Author information

1
Department of Biochemistry, University of Colorado Health Sciences Center, Denver 80262.

Abstract

All cellular cytoplasmic mRNAs carry a 7-methylguanylate cap attached to their 5' ends. This cap structure is recognized by cap-binding proteins that then direct the binding of ribosomal subunits to this 5'-end complex. Poliovirus, a plus-stranded RNA virus, interferes with this cellular translation process by proteolytically inactivating the cap-binding protein complex. Subsequently the viral mRNA can be translated by an initiation process in which ribosomes bind internally to the mRNA [Pelletier, J. & Sonenberg, N. (1988) Nature (London) 334, 320-325], obviating cap-dependent translation. At least one cellular mRNA, encoding a heat shock-like protein, glucose-regulated protein 78/immunoglobulin heavy-chain binding protein, has been discovered to be translated at an increased rate in poliovirus-infected cells at a time when the translation of other cellular mRNAs is inhibited. The glucose-regulated protein 78/immunoglobulin heavy-chain binding protein mRNA thus exemplifies a cellular mRNA that is translated at a specifically enhanced rate by an as-yet-unresolved cap-independent initiation process in cells when the cap-binding protein complex is not functional.

PMID:
2548189
PMCID:
PMC297717
[Indexed for MEDLINE]
Free PMC Article

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