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Initiation of Translation

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 Translation

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...

Improving Translational Accuracy

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 Accuracy

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...

Conserved Binding Sites

Conserved Binding Sites

Many proteins’ biological role depends on their interactions with their ligands, small molecules that bind to specific locations on the protein known as ligand-binding sites. Ligand-binding sites are often conserved among homologous proteins as these sites are critical for protein function.
Binding sites are often located in large pockets, and if their location on a protein’s surface is unknown, it can be predicted using various approaches. The energetic method computationally analyses the...

Leaky Scanning

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...

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Related Experiment Video

Updated: Jul 10, 2026

Toeprinting Analysis of Translation Initiation Complex Formation on Mammalian mRNAs

Toeprinting Analysis of Translation Initiation Complex Formation on Mammalian mRNAs

Published on: May 10, 2018

MANTIS: a data mining methodology for effective translation initiation site prediction.

George Tzanis¹, Christos Berberidis, Ioannis Vlahavas

¹Department of Informatics, Aristotle University of Thessaloniki, Thessaloniki, Greece. gtzanis@csd.auth.gr

Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference

|November 16, 2007

Summary

Accurately predicting translation initiation sites in genomic sequences is crucial. Our new methodology improves accuracy by combining multiple components and a meta-classification system, achieving the highest reported results.

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Last Updated: Jul 10, 2026

Toeprinting Analysis of Translation Initiation Complex Formation on Mammalian mRNAs

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Area of Science:

Genomics
Bioinformatics
Computational Biology

Background:

Accurate prediction of translation initiation sites (TIS) is essential for understanding gene function and regulation.
Existing TIS prediction methods show good performance but lack a universally applicable, highly accurate framework.

Purpose of the Study:

To develop a novel, highly accurate, and reliable methodology for predicting translation initiation sites in genomic sequences.
To create a generalizable framework for researchers in the field.

Main Methods:

Developed a modular prediction methodology integrating ad hoc and discovered knowledge.
Employed a meta-classification system using stacked generalization.
Incorporated three key decision components: consensus, coding region classification, and a novel ATG location-based component.

Main Results:

The proposed methodology significantly increased prediction accuracy and adjusted accuracy.
Experimental results on four diverse datasets demonstrated statistically significant improvements.
Achieved the highest reported accuracy compared to existing methods.

Conclusions:

The developed prediction framework offers a reliable and effective approach for TIS identification.
The novel ATG location-based component effectively utilizes and improves upon the Ribosome Scanning Model.
This methodology represents a significant advancement in the field of genomic sequence analysis.