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- W348521906 abstract "We have investigated the hypothesis that preferential translation of the heat stress mRNAs requires the binding of a trans-acting protein factor. 32P-Labeled RNA probes covering the 5'-untranslated region (5'-UTR) of HSP70 mRNA were synthesized, and gel retardation and UV cross-linking assays performed to identify trans-acting sequence-specific RNA-binding factors. The results indicate that no HSP70 5'-UTR RNA-specific binding proteins exist. Reducing the stringency in the gel retardation binding analyses revealed several non-sequence-specific RNA-binding complexes. The proteins bind RNA more strongly than DNA, show minor preferences for specific sequences, but none binds more strongly to the HSP70 5'-UTR than to other non-heat stress RNAs. Ultraviolet cross-linking analysis identifies two principal HSP70 5'-UTR binding proteins, of approximately 50 and 70 kDa. The p50 binding activity is increased severalfold for all mRNAs in heat-stressed lysates, and its binding produces the primary gel-retarded complex. Further detailed analyses were performed to probe for any possible heat-influenced changes. RNA/protein interactions are not affected by capping. Neither the kinetics nor the salt sensitivity of protein binding is affected by heat. Binding analyses using partial or complete HSP70 5'-UTR give qualitatively similar conclusions. Binding analyses were also carried out with several 5'-UTRs to investigate whether a heat-induced repressor might be activated by heating. No normal mRNA-specific heat-induced binding changes are detected. We conclude that heat-induced alterations in RNA-binding proteins do not mediate preferential translation of heat stress mRNAs or repression of normal mRNAs." @default.
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- W348521906 date "1994-04-01" @default.
- W348521906 modified "2023-09-28" @default.
- W348521906 title "RNA/protein interactions in the 5'-untranslated leader of HSP70 mRNA in Drosophila lysates. Lack of evidence for specific protein binding." @default.
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- W348521906 doi "https://doi.org/10.1016/s0021-9258(17)34145-5" @default.
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