Codon optimality-mediated mRNA degradation: Linking translational elongation to mRNA stability.
Codon optimality-mediated mRNA degradation: Linking translational elongation to mRNA stability.
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DOI:
10.1016/j.molcel.2022.03.032
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发表时间:
2022-04-21
期刊:
影响因子:
16
通讯作者:
Coller, Jeff
中科院分区:
文献类型:
--
作者:
Bae, Haneui;Coller, Jeff
Messenger RNA (mRNA) translation by the ribosome represents the final step on a complicated molecular dance from DNA to protein. Though classically considered a decipherer that translates our 64-word genetic code into a proteome of astonishing complexity, recent work has unexpectedly shown that the ribosome can also shape the expressed mRNA transcriptome by controlling mRNA stability. Recent work has discovered that the ribosome is a master arbiter of the general mRNA degradation pathway, wherein ribosome transit rate serves as a major determinant of transcript half-lives. Specifically, members of the degradation complex sense ribosome translocation rate as a function of ribosome elongation rate. Central to this notion is the concept of Codon Optimality: though all codons impact translation rate, some are deciphered quickly while others cause ribosome hesitation (a consequence of relative cognate tRNA concentration). These transient pauses induce a unique ribosome conformational state that is probed by the deadenylase complex, thereby inducing an orchestrated set of events that enhance both poly(A) shortening and cap removal. Together, these data implicate that the coding region of an mRNA not only encodes for protein content, but also impacts protein levels through determining the transcript’s fate.
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