Mechanisms of ribosome stalling by SecM at multiple elongation steps
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چکیده
منابع مشابه
Mechanisms of ribosome stalling by SecM at multiple elongation steps
Regulation of translating ribosomes is a major component of gene expression control network. In Escherichia coli, ribosome stalling by the C-terminal arrest sequence of SecM regulates the SecA-dependent secretion pathway. Previous studies reported many residues of SecM peptide and ribosome exit tunnel are critical for stalling. However, the underlying molecular mechanism is still not clear at t...
متن کاملFigures and figure supplements Mechanisms of ribosome stalling by SecM at multiple elongation steps
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Mechanisms of SecM-mediated stalling in the ribosome.
Nascent-peptide modulation of translation is a common regulatory mechanism of gene expression. In this mechanism, while the nascent peptide is still in the exit tunnel of the ribosome, it induces translational pausing, thereby controlling the expression of downstream genes. One example is SecM, which inhibits peptide-bond formation in the ribosome's peptidyl transferase center (PTC) during its ...
متن کاملThe dynamics of SecM-induced translational stalling.
SecM is an E. coli secretion monitor capable of stalling translation on the prokaryotic ribosome without cofactors. Biochemical and structural studies have demonstrated that the SecM nascent chain interacts with the 50S subunit exit tunnel to inhibit peptide bond formation. However, the timescales and pathways of stalling on an mRNA remain undefined. To provide a dynamic mechanism for stalling,...
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Ribosome stalling during translation has recently been shown to cause neurodegeneration, yet the signaling pathways triggered by stalled elongation complexes are unknown. To investigate these pathways we analyzed the brain of C57BL/6J-Gtpbp2(nmf205)(-/-) mice in which neuronal elongation complexes are stalled at AGA codons due to deficiencies in a tRNA(Arg)UCU tRNA and GTPBP2, a mammalian ribos...
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ژورنال
عنوان ژورنال: eLife
سال: 2015
ISSN: 2050-084X
DOI: 10.7554/elife.09684