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Related Concept Videos

Translational Regulation01:29

Translational Regulation

Translational regulation in prokaryotes ensures efficient protein synthesis by controlling ribosome access to mRNA. This regulation is mediated by secondary RNA structures, including translational riboswitches, RNA thermometers, and small RNAs (sRNAs), which respond to intracellular and environmental signals to modulate gene expression.Translational RiboswitchesRiboswitches in the leader region of mRNAs can regulate translation by altering the accessibility of the Shine-Dalgarno (SD) sequence,...
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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...
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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...
Regulation of Expression Occurs at Multiple Steps02:24

Regulation of Expression Occurs at Multiple Steps

Gene expression can be regulated at almost every step from gene to protein. Transcription is the step that is most commonly regulated. This involves the binding of proteins to short regulatory sequences on the DNA. This association can either promote or inhibit the transcription of a gene associated with the respective sequence.
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Regulation of Expression at Multiple Steps01:23

Regulation of Expression at Multiple Steps

The gene expression in cells is regulated at different stages: (i) transcription, (ii) RNA processing, (iii) RNA localization, and (iv) translation. Transcriptional regulation is mediated by regulatory proteins such as transcription factors, activators, or repressors—these control gene expression by initiating or inhibiting the transcription of genes. Once a precursor or pre-mRNA is produced, it undergoes post-transcriptional modification, including 5' capping, splicing, and the addition of a...
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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...

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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

Ribosomal tunnel and translation regulation.

A A Bogdanov1, N V Sumbatyan, A V Shishkina

  • 1Belozersky Institute of Physico-Chemical Biology and Chemical Faculty, Lomonosov Moscow State University, Russia. bogdanov@belozersky.msu.ru

Biochemistry. Biokhimiia
|March 23, 2011
PubMed
Summary
This summary is machine-generated.

This review explores the ribosomal tunnel's structure and function, detailing how nascent polypeptide chains navigate it. It highlights interactions within the tunnel that regulate gene expression through ribosome stalling.

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Area of Science:

  • Molecular Biology
  • Structural Biology
  • Biochemistry

Background:

  • The ribosomal tunnel (RT) facilitates the passage of newly synthesized proteins from the ribosome.
  • Understanding RT structure is crucial for protein folding and regulation.
  • Nascent polypeptide interactions within the RT influence protein conformation and gene expression.

Purpose of the Study:

  • To review recent findings on the ribosomal tunnel's structural organization and function.
  • To discuss the role of the RT in modulating nascent polypeptide conformation.
  • To explore macrolide antibiotic interactions and regulatory polypeptide effects within the RT.

Main Methods:

  • Review of recent structural and biochemical studies.
  • Analysis of high-resolution structural data of nascent chains in the RT.
  • Investigation of ligand-tunnel wall interactions.

Main Results:

  • The RT's structure stabilizes nascent chain conformation.
  • Macrolide antibiotics bind to specific sites within the RT.
  • Regulatory polypeptides interact with the RT, causing ribosome stalling and translational arrest.
  • These interactions play a role in gene expression regulation.

Conclusions:

  • The ribosomal tunnel is a dynamic structure critical for protein synthesis and regulation.
  • Specific interactions within the RT, including those with antibiotics and regulatory peptides, offer insights into molecular mechanisms.
  • Further research into RT dynamics can illuminate novel therapeutic strategies and gene regulation pathways.