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The ribosome triggers the stringent response by RelA via a highly distorted tRNA.


ABSTRACT: The bacterial stringent response links nutrient starvation with the transcriptional control of genes. This process is initiated by the stringent factor RelA, which senses the presence of deacylated tRNA in the ribosome as a symptom of amino-acid starvation to synthesize the alarmone (p)ppGpp. Here we report a cryo-EM study of RelA bound to ribosomes bearing cognate, deacylated tRNA in the A-site. The data show that RelA on the ribosome stabilizes an unusual distorted form of the tRNA, with the acceptor arm making contact with RelA and far from its normal location in the peptidyl transferase centre.

SUBMITTER: Agirrezabala X 

PROVIDER: S-EPMC3790049 | biostudies-literature | 2013 Sep

REPOSITORIES: biostudies-literature

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The ribosome triggers the stringent response by RelA via a highly distorted tRNA.

Agirrezabala Xabier X   Fernández Israel S IS   Kelley Ann C AC   Cartón David Gil DG   Ramakrishnan Venki V   Valle Mikel M  

EMBO reports 20130723 9


The bacterial stringent response links nutrient starvation with the transcriptional control of genes. This process is initiated by the stringent factor RelA, which senses the presence of deacylated tRNA in the ribosome as a symptom of amino-acid starvation to synthesize the alarmone (p)ppGpp. Here we report a cryo-EM study of RelA bound to ribosomes bearing cognate, deacylated tRNA in the A-site. The data show that RelA on the ribosome stabilizes an unusual distorted form of the tRNA, with the a  ...[more]

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