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Related Concept Videos

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...
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...
Methods of Medium Optimization01:28

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Optimizing growth media enhances microbial proliferation and maximizes product yield. Statistical experimental design methodologies provide structured and reproducible approaches, offering progressively higher levels of robustness and efficiency.The One-Factor-at-a-Time (OFAT) MethodThe One-Factor-at-a-Time (OFAT) method involves adjusting a single variable while keeping all others constant. However, it cannot detect interactions between variables, often leading to suboptimal outcomes when...
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During most eukaryotic translation processes, the small 40S ribosome subunit scans an mRNA from its 5' end until it encounters the first start AUG codon. The large 60S ribosomal subunit then joins the smaller one to initiate protein synthesis. The location of the translation initiation is largely determined by the nucleotides near the start codon as there may be multiple translation initiation sites present on the mRNA.  Marilyn Kozak discovered that the sequence RCCAUGG (where R stands for...
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Ribosome Profiling

Ribosome profiling or ribo-sequencing is a deep sequencing technique that produces a snapshot of active translation in a cell. It selectively sequences the mRNAs protected by ribosomes to get an insight into a cell’s translation landscape at any given point in time.
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Strain improvement is a foundational strategy in industrial microbiology aimed at maximizing microbial productivity, particularly because natural isolates typically yield commercially valuable products in very low concentrations. Although optimizing the culture medium and environmental conditions can improve yields, these adjustments are inherently limited by the organism’s genetic potential. As a result, the focus shifts toward genetic modifications to enhance biosynthetic capacity. The...

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Measurement of Specific Mycobacterial Mistranslation Rates with Gain-of-function Reporter Systems
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A genetic optimization approach for isolating translational efficiency bias.

Douglas W Raiford1, Dan E Krane, Travis E W Doom

  • 1Department of Computer Science, University of Montana, 32 Campus Dr., Missoula, MT 59812, USA.

IEEE/ACM Transactions on Computational Biology and Bioinformatics
|January 15, 2011
PubMed
Summary
This summary is machine-generated.

We developed a new method to accurately measure translational efficiency bias in microbial genomes. This approach overcomes limitations of previous methods, providing reliable results from genomic data alone.

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Area of Science:

  • Genomics
  • Molecular Evolution
  • Bioinformatics

Background:

  • Codon usage bias is crucial for understanding molecular evolution and organism characteristics.
  • Translational efficiency bias, a key aspect of codon usage bias, predicts protein expression levels.
  • Existing methods for isolating translational efficiency bias are often confounded by other biases and require prior gene expression data.

Purpose of the Study:

  • To present a novel computational approach for isolating translational efficiency bias in microbial genomes.
  • To develop a method that is accurate and robust against confounding biases.
  • To provide a tool that relies solely on genomic sequence information.

Main Methods:

  • Developed a novel algorithm to specifically isolate translational efficiency bias.
  • The method is designed to resist confounding influences from other codon usage biases.
  • Validated the approach on 10 microbial genomes, including five challenging cases.

Main Results:

  • The novel approach accurately isolates translational efficiency bias.
  • Demonstrated increased accuracy compared to existing methods, especially in genomes with strong confounding biases.
  • Successfully applied the method to diverse microbial genomes.

Conclusions:

  • The new method offers a more accurate and reliable way to study translational efficiency bias.
  • This advancement facilitates deeper insights into microbial genome evolution and gene expression.
  • The approach simplifies the analysis by not requiring prior knowledge of highly expressed genes.