Structural insight into nascent polypeptide chain-mediated translational stalling.

Structural insight into nascent polypeptide chain-mediated translational stalling.
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DOI:
10.1126/science.1177662
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发表时间:
2009-12-04
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Beckmann R
Beckmann R
中科院分区:
其他
文献类型:
--
作者:
Seidelt B;Innis CA;Wilson DN;Gartmann M;Armache JP;Villa E;Trabuco LG;Becker T;Mielke T;Schulten K;Steitz TA;Beckmann R

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Expression of the Escherichia coli tryptophanase operon depends upon ribosome stalling during translation of the upstream TnaC leader peptide, a process for which interactions between the TnaC nascent chain and the ribosomal exit tunnel are critical. We determined a 5.8 Å resolution cryo-electron microscopy and single particle reconstruction of a ribosome stalled during translation of the tnaC leader gene. The nascent chain was extended within the exit tunnel, making contacts with ribosomal components at distinct sites. Upon stalling, two conserved residues within the peptidyltransferase center adopted conformations that preclude binding of release factors. We propose a model whereby interactions within the tunnel are relayed to the peptidyltransferase center to inhibit translation. Moreover, we show that nascent chains adopt distinct conformations within the ribosomal exit tunnel.
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