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Structural characterization of mRNA-tRNA translocation intermediates.


ABSTRACT: Cryo-EM analysis of a wild-type Escherichia coli pretranslocational sample has revealed the presence of previously unseen intermediate substates of the bacterial ribosome during the first phase of translocation, characterized by intermediate intersubunit rotations, L1 stalk positions, and tRNA configurations. Furthermore, we describe the domain rearrangements in quantitative terms, which has allowed us to characterize the processivity and coordination of the conformational reorganization of the ribosome, along with the associated changes in tRNA ribosome-binding configuration. The results are consistent with the view of the ribosome as a molecular machine employing Brownian motion to reach a functionally productive state via a series of substates with incremental changes in conformation.

SUBMITTER: Agirrezabala X 

PROVIDER: S-EPMC3340995 | biostudies-literature | 2012 Apr

REPOSITORIES: biostudies-literature

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Structural characterization of mRNA-tRNA translocation intermediates.

Agirrezabala Xabier X   Liao Hstau Y HY   Schreiner Eduard E   Fu Jie J   Ortiz-Meoz Rodrigo F RF   Schulten Klaus K   Green Rachel R   Frank Joachim J  

Proceedings of the National Academy of Sciences of the United States of America 20120330 16


Cryo-EM analysis of a wild-type Escherichia coli pretranslocational sample has revealed the presence of previously unseen intermediate substates of the bacterial ribosome during the first phase of translocation, characterized by intermediate intersubunit rotations, L1 stalk positions, and tRNA configurations. Furthermore, we describe the domain rearrangements in quantitative terms, which has allowed us to characterize the processivity and coordination of the conformational reorganization of the  ...[more]

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