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Related Concept Videos

Termination of Translation01:44

Termination of Translation

The large ribosomal subunit has several important structures essential to translation. These include the peptidyl transferase center (PTC) - which is the site where the peptide bond is formed - and a large, internal, water-filled tube through which the nascent polypeptide moves. This latter structure is called the Peptide Exit Tunnel, and it begins at the PTC and spans the body of the large ribosomal subunit. During translation, as the nascent polypeptide chain is synthesized, it passes through...
Termination of Translation01:44

Termination of Translation

The large ribosomal subunit has several important structures essential to translation. These include the peptidyl transferase center (PTC) - which is the site where the peptide bond is formed - and a large, internal, water-filled tube through which the nascent polypeptide moves. This latter structure is called the Peptide Exit Tunnel, and it begins at the PTC and spans the body of the large ribosomal subunit. During translation, as the nascent polypeptide chain is synthesized, it passes through...
Translation in Prokaryotes01:29

Translation in Prokaryotes

Prokaryote translation is a complex, highly coordinated process that converts genetic information from mRNA into functional proteins. It involves three stages: initiation, elongation, and termination, each facilitated by specific molecular components.Initiation of TranslationThe process begins with the assembly of the ribosomal subunits and initiation factors on the mRNA. In bacteria, the 30S ribosomal subunit recognizes the Shine-Dalgarno sequence in the mRNA, a conserved region upstream of...
Improving Translational Accuracy02:07

Improving Translational Accuracy

Base complementarity between the three base pairs of mRNA codon and the tRNA anticodon is not a failsafe mechanism. Inaccuracies can range from a single mismatch to no correct base pairing at all. The free energy difference between the correct and nearly correct base pairs can be as small as 3 kcal/ mol. With complementarity being the only proofreading step, the estimated error frequency would be one wrong amino acid in every 100 amino acids incorporated. However, error frequencies observed in...
Initiation of Translation02:33

Initiation of Translation

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.
First, the initiator tRNA must be selected from the pool of elongator tRNAs by eukaryotic initiation factor 2 (eIF2). The initiator tRNA (Met-tRNAi) has conserved sequence elements including modified bases at...
Initiation of Translation02:33

Initiation of Translation

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.
First, the initiator tRNA must be selected from the pool of elongator tRNAs by eukaryotic initiation factor 2 (eIF2). The initiator tRNA (Met-tRNAi) has conserved sequence elements including modified bases at...

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Related Experiment Video

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Isolation of Translating Ribosomes Containing Peptidyl-tRNAs for Functional and Structural Analyses
11:19

Isolation of Translating Ribosomes Containing Peptidyl-tRNAs for Functional and Structural Analyses

Published on: February 25, 2011

Molecular recognition and catalysis in translation termination complexes.

Bruno P Klaholz1

  • 1IGBMC (Institute of Genetics and of Molecular and Cellular Biology), Department of Structural Biology and Genomics, Illkirch, France. klaholz@igbmc.fr

Trends in Biochemical Sciences
|March 23, 2011
PubMed
Summary

Protein synthesis termination involves release factors (RFs). Structural studies reveal how RF1/RF2 recognize stop codons and release polypeptide chains, with class-II RFs aiding this process.

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Area of Science:

  • Molecular Biology
  • Structural Biology
  • Biochemistry

Background:

  • Protein synthesis terminates when ribosomes encounter stop codons.
  • Class-I release factors (RFs) catalyze polypeptide release, while class-II RFs facilitate class-I RF removal.
  • Ribosome-RF interactions are crucial for accurate translation termination.

Purpose of the Study:

  • To elucidate the molecular mechanisms of stop codon recognition and peptide release by class-I RFs.
  • To understand the structural basis of discrimination between different stop codons (UAA, UAG, UGA).
  • To provide insights into the role of class-II RFs in termination.

Main Methods:

  • Cryo-electron microscopy (Cryo-EM) of ribosome termination complexes.
  • X-ray crystallography of isolated release factors.
  • Structural analysis of functional ribosome complexes.

Main Results:

  • Crystal structures revealed how RF1/RF2 bind to stop codons on the ribosome.
  • Mechanisms for peptide release catalysis by RF1/RF2 were uncovered.
  • Specific molecular interactions explain the differential recognition of UAG and UGA codons by RF1/RF2.

Conclusions:

  • Structural data illuminate the precise molecular mechanisms of stop codon recognition and peptide release by class-I RFs.
  • Understanding these mechanisms is key to deciphering translation termination.
  • Further research on class-II RFs will complete the picture of termination factor function.