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Related Concept Videos

Ribosomes01:27

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Ribosomes translate genetic information encoded by messenger RNA (mRNA) into proteins. Both prokaryotic and eukaryotic cells have ribosomes. Cells that synthesize large quantities of protein—such as secretory cells in the human pancreas—can contain millions of ribosomes.
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Initiating translation is complex because it involves multiple molecules. Initiator tRNA, ribosomal subunits, and eukaryotic initiation factors (eIFs) are all required to assemble on the initiation codon of mRNA. This process consists of several steps that are mediated by different eIFs.
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Toeprinting Analysis of Translation Initiation Complex Formation on Mammalian mRNAs
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Structure of a yeast 40S-eIF1-eIF1A-eIF3-eIF3j initiation complex.

Christopher H S Aylett1, Daniel Boehringer1, Jan P Erzberger1

  • 1Institute for Molecular Biology and Biophysics, Eidgenössische Technische Hochschule (ETH) Zürich, Zürich, Switzerland.

Nature Structural & Molecular Biology
|February 10, 2015
PubMed
Summary
This summary is machine-generated.

Researchers visualized the yeast translation initiation complex using cryo-electron microscopy (cryo-EM). This revealed distinct binding to the ribosome and interactions between key protein factors like eukaryotic initiation factor 3 (eIF3) subunits.

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Area of Science:

  • Molecular Biology
  • Structural Biology
  • Biochemistry

Background:

  • Eukaryotic translation initiation is a complex process involving the assembly of numerous protein factors at the 40S ribosomal subunit.
  • Understanding the precise architecture of these initiation complexes is crucial for deciphering gene expression regulation.

Purpose of the Study:

  • To determine the high-resolution structure of a budding yeast translation initiation complex.
  • To elucidate the interactions between eukaryotic initiation factors (eIFs) and the 40S ribosomal subunit.
  • To compare yeast and mammalian translation initiation complex structures.

Main Methods:

  • Cryo-electron microscopy (cryo-EM) was employed to resolve the structure of the budding yeast initiation complex.
  • Integration of prior structural data for individual factors, including eIF1, eIF1A, eIF3a, eIF3b, and eIF3c.

Main Results:

  • A detailed cryo-EM structure of the yeast 40S ribosomal subunit bound to the translation initiation complex was obtained.
  • Significant differences were observed in the binding of the yeast initiation complex to the ribosome compared to mammalian eIF3.
  • A direct interaction between eIF3j and eIF1A was identified, along with the intricate network of interactions among eIF3 subunits.

Conclusions:

  • The resolved structure provides unprecedented insight into the architecture of eukaryotic translation initiation.
  • The findings highlight species-specific differences in translation initiation complex assembly and ribosome binding.
  • The identified interactions offer a foundation for understanding the functional roles of eIF3 subunits and their regulation.