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Key for protein coding sequences identification: computer analysis of codon strategy

F Rodier, J Gabarro-Arpa, R Ehrlich

    Nucleic Acids Research
    |January 11, 1982
    PubMed
    Summary
    This summary is machine-generated.

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    Initiator codons in E. coli are not defined by sequence homology but by low-stability RNA domains rich in A/U. This codon bias aids in translation initiation and protein-coding sequence detection.

    Area of Science:

    • Molecular Biology
    • Bioinformatics
    • Genomics

    Background:

    • The initiation of protein synthesis in Escherichia coli (E. coli) relies on specific start codons (AUG or GUG).
    • The precise signals governing the selection of these initiator codons have been a subject of investigation.
    • Previous hypotheses often centered on specific sequence homologies near the start codon.

    Purpose of the Study:

    • To investigate the characteristics of sequences surrounding initiator codons in E. coli messenger RNA (mRNA).
    • To determine if a systematic sequence homology dictates initiator codon selection.
    • To explore the relationship between RNA structure, codon usage, and translation initiation.

    Main Methods:

    • Analysis of mRNA sequences from E. coli.

    Related Experiment Videos

  • Stability analysis of nucleic acid domains.
  • Computational analysis of codon usage patterns.
  • Examination of N-terminal protein sequences.

    • Main Results:

    • No systematic, literal sequence homology was found to qualify AUG or GUG as initiator codons.
    • Initiator codons consistently occur within nucleic acid domains exhibiting low stability.
    • A high Adenine/Uracil (A/U) content is characteristic of these low-stability domains.
    • No significant amino acid selection pressure was detected at the N-termini of proteins.
    • A biased usage of genetic code degeneracy, specifically in the third codon position (A or U), was observed.

    Conclusions:

    • Translation initiation in E. coli is primarily influenced by the local RNA structural context (low stability domains) rather than specific sequence homology.
    • The observed A/U enrichment in N-terminal codons results from biased codon usage, not amino acid selection.
    • The identified codon strategy provides a mechanism for efficient translation initiation.
    • This codon bias can be utilized as a computational tool for detecting protein-coding sequences in genomic data.