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Ribosomes01:27

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Isolation of Translating Ribosomes Containing Peptidyl-tRNAs for Functional and Structural Analyses
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Structure of the 30S ribosomal decoding complex at ambient temperature.

E Han Dao1, Frédéric Poitevin1,2, Raymond G Sierra1,3

  • 1Stanford PULSE Institute, SLAC National Laboratory, Menlo Park, California 94025, USA.

RNA (New York, N.Y.)
|August 25, 2018
PubMed
Summary

Researchers captured a high-resolution X-ray crystal structure of the Thermus thermophilus 30S ribosomal subunit decoding complex at ambient temperature. This breakthrough enables near-physiological temperature studies of RNA and protein complexes, overcoming previous limitations.

Keywords:
ambient temperatureantibioticsdecodingribosomeserial femtosecond X-ray crystallography

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Area of Science:

  • Molecular Biology
  • Structural Biology
  • Biophysics

Background:

  • Ribosomes translate messenger RNA (mRNA) into proteins via transfer RNA (tRNA) selection, guided by the genetic code.
  • High-resolution structural studies of ribosomal decoding complexes traditionally require cryogenic temperatures, limiting physiological relevance.
  • Advancements in X-ray free electron laser (XFEL) technology allow data collection from macromolecular crystals at ambient temperatures.

Purpose of the Study:

  • To determine the X-ray crystal structure of the Thermus thermophilus 30S ribosomal subunit decoding complex at ambient temperature.
  • To compare the ambient-temperature structure with existing cryogenic-temperature structures.
  • To demonstrate the feasibility of using XFELs for structural studies of ribosomal complexes at near-physiological temperatures.

Main Methods:

  • Serial crystallography using X-ray free electron laser (XFEL) at the Linac Coherent Light Source (LCLS).
  • Data collection from Thermus thermophilus 30S ribosomal subunit microcrystals at ambient temperature.
  • X-ray diffraction analysis to determine the 3.45 Å resolution structure.

Main Results:

  • A 3.45 Å resolution X-ray crystal structure of the Thermus thermophilus 30S ribosomal subunit decoding complex was obtained at ambient temperature.
  • The ambient-temperature structure is largely consistent with previously determined cryogenic structures, showing similar conformations for key residues like adenosine 1492 and 1493.
  • Minor structural variations were observed, including an alternative conformation of cytosine 1397 near the mRNA channel and A-site.

Conclusions:

  • Ambient temperature X-ray crystallography using XFELs is a viable method for studying ribosomal decoding complexes.
  • This approach overcomes the limitations of cryogenic temperatures, enabling structural insights into RNA and protein complexes at near-physiological conditions.
  • The findings pave the way for routine structural studies of dynamic biological processes involving ribosomes at biologically relevant temperatures.