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Cap analogs m7GMP and m7GDP inhibit binding of eukaryotic initiation factors to reovirus capped mRNA but also inhibit complex formation involving uncapped mRNA or 18 S rRNA. Furthermore, Escherichia coli DNA-dependent RNA polymerase binds 18 S rRNA and this interaction is also blocked by m7GMP. These results indicate that inhibition by cap analogs is not a stringent test for putative cap-specific binding between proteins and mRNA.
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Sonenberg et al. (1978) studied this question.
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