Preferential Cleavage of Degradative Intermediates of rpsT mRNA by the Escherichia coli RNA Degradosome

AUTOR(ES)

Spickler, Catherine

FONTE

American Society for Microbiology

RESUMO

RNase E, the principal RNase capable of initiating mRNA decay, preferentially attacks 5′-monophosphorylated over 5′-triphosphorylated substrates. Site-specific cleavage in vitro of the rpsT mRNA by RNase H directed by chimeric 2′-O-methyl oligonucleotides was employed to create truncated RNAs which are identical to authentic degradative intermediates. The rates of cleavage of two such intermediates by RNase E in the RNA degradosome are significantly faster (2.5- to 8-fold) than that of intact RNA. This verifies the preference of RNase E for degradative intermediates and can explain the frequent “all-or-none” behavior of mRNAs during the decay process.

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