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Cryoelectron microscopy structures of the ribosome complex in intermediate states during tRNA translocation

Jie Fu1, James B Munro, Scott C Blanchard

  • 1Howard Hughes Medical Institute, Department of Biochemistry and Molecular Biophysics, Columbia University, New York, NY 10032, USA. jf2192@columbia.edu

Proceedings of the National Academy of Sciences of the United States of America
|March 9, 2011
PubMed

Insights

Ribosome translocation, the movement of mRNA and tRNA during protein synthesis, involves novel intermediate structures. These findings reveal a new mechanism for regulating the speed of this essential cellular process.

Area of Science:

  • Molecular Biology
  • Structural Biology
  • Biochemistry

Background:

  • mRNA-tRNA translocation is a critical and tightly controlled step in translational elongation.
  • This process involves the stepwise movement of messenger RNA (mRNA) and transfer RNA (tRNA) through the ribosome.

Purpose of the Study:

  • To investigate the structural basis of mRNA-tRNA translocation.
  • To identify transient intermediates during ribosome translocation using a P-loop mutated ribosome.

Main Methods:

  • Utilized cryoelectron microscopy (cryo-EM) to visualize ribosome structures.
  • Focused on ribosomes engineered with a specific P-loop mutation to trap intermediate states.

Main Results:

  • Identified novel structural intermediates during the translocation process.
  • These intermediates provide insights into the dynamic movement of mRNA and tRNA within the ribosome.

Conclusions:

  • The observed intermediates suggest a detailed mechanism for ribosome translocation.
  • These findings offer a potential pathway for regulating the rate of translational elongation.

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