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Related Concept Videos

Epistasis Analysis01:09

Epistasis Analysis

Although Mendel chose seven unrelated traits in peas to study gene segregation, most traits involve multiple gene interactions that create a spectrum of phenotypes. When the interaction of various genes or alleles at different locations influences a phenotype, this is called epistasis. Epistasis often involves one gene masking or interfering with the expression of another (antagonistic epistasis). Epistasis often occurs when different genes are part of the same biochemical pathway. The...
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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...
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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Leaky Scanning

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...
Coordination of Gene Expression Processes in Bacteria01:29

Coordination of Gene Expression Processes in Bacteria

The DNA replication, transcription, and translation processes are intricately coupled in bacteria, allowing efficient gene expression and rapid protein synthesis. While this physical and functional coordination is advantageous, it introduces challenges that bacteria overcome through specific regulatory mechanisms.Coupling of Replication, Transcription, and TranslationThe coupling of replication, transcription, and translation is a hallmark of bacterial gene expression. As the replisome unwinds...
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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In vivo Interrogation of Central Nervous System Translatome by Polyribosome Fractionation
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Quantifying epistatic interactions among the components constituting the protein translation system.

Tomoaki Matsuura1, Yasuaki Kazuta, Takuyo Aita

  • 1Department of Bioinformatics Engineering, Graduate School of Information Science and Technology, Osaka University, Suita, Osaka, Japan.

Molecular Systems Biology
|August 20, 2009
PubMed
Summary

Developing kinetic models for biological systems is challenging due to parameter requirements. This study simplifies protein synthesis modeling by quantifying epistatic interactions, enabling accurate predictions with fewer data points.

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Area of Science:

  • Systems Biology
  • Molecular Biology
  • Biophysics

Background:

  • Developing large-scale kinetic models of biological systems is hindered by the extensive parameters required.
  • Obtaining these numerous parameters in practice presents a significant challenge for researchers.

Purpose of the Study:

  • To develop a coarse-grained model of protein synthesis activity using an in vitro translation system.
  • To quantify epistatic interactions among component concentrations and simplify kinetic modeling.

Main Methods:

  • Utilized an in vitro translation system with 69 defined components.
  • Employed Bahadur expansion to quantify epistatic interactions between component concentrations.
  • Analyzed data from various component concentration combinations.

Main Results:

  • The contributions of epistatic interactions beyond two-body terms were found to be negligible.
  • Protein synthesis activity could be predicted from limited samples across different component concentrations.
  • The ratio of 2-body to 1-body terms was estimated to be low (0.1).

Conclusions:

  • The study presents a simplified approach to modeling biological systems, applicable beyond protein synthesis.
  • The findings suggest high adaptability and evolvability within the protein translation system.
  • This coarse-grained modeling principle can aid in the analysis and optimization of other biological processes.