Coupled 5' nucleotide recognition and processivity in Xrn1-mediated mRNA decay.
Coupled 5' nucleotide recognition and processivity in Xrn1-mediated mRNA decay.
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DOI:
10.1016/j.molcel.2011.02.004
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发表时间:
2011-03-04
期刊:
影响因子:
16
通讯作者:
Doudna JA
中科院分区:
文献类型:
--
作者:
Jinek M;Coyle SM;Doudna JA
Messenger RNA decay plays a central role in the regulation and surveillance of eukaryotic gene expression. The conserved multi-domain exoribonuclease Xrn1 targets cytoplasmic RNA substrates marked by a 5′ monophosphate for processive 5′-to-3′ degradation by an unknown mechanism. Here we report the crystal structure of an Xrn1-substrate complex. The single-stranded substrate is held in place by stacking of the 5′-terminal trinucleotide between aromatic side chains while a highly basic pocket specifically recognizes the 5′ phosphate. Mutations of residues involved in binding the 5′-terminal nucleotide impair Xrn1 processivity. The substrate recognition mechanism allows Xrn1 to couple processive hydrolysis to duplex melting in RNA substrates with sufficiently long single-stranded 5′ overhangs. The Xrn1-substrate complex structure thus rationalizes the exclusive specificity of Xrn1 for 5′-monophosphorylated substrates, ensuring fidelity of mRNA turnover, and posits a model for translocation-coupled unwinding of structured RNA substrates.
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作者:
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通讯作者:
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