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Origin of chirality: a structural theory.

M Shimizu

    Origins of Life
    |January 1, 1984
    PubMed
    Summary
    This summary is machine-generated.

    The origin of molecular chirality, a fundamental property of life, is explained by specific interactions between transfer RNA (tRNA) and amino acids. This stereochemical theory offers a scientific basis for chirality

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    Area of Science:

    • Biochemistry
    • Molecular Biology
    • Origin of Life Studies

    Background:

    • Chirality, or 'handedness,' is essential for biological molecules like amino acids and nucleic acids.
    • The origin of homochirality (predominance of one enantiomer) in biological systems remains a significant scientific question.
    • Existing theories include the 'frozen accident' hypothesis and stereochemical models.

    Purpose of the Study:

    • To present a molecular mechanism for the origin of chirality in biological systems.
    • To explore the role of transfer RNA (tRNA) and its interaction with amino acids in establishing homochirality.
    • To compare the proposed stereochemical theory with the 'frozen accident' hypothesis.

    Main Methods:

    • Analysis of molecular interactions between anticodon bases and discriminator bases of D-type tRNA.

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  • Examination of the stereochemical recognition capabilities of tRNA-amino acid complexes.
  • Review and comparison of experimental evidence supporting different theories of chirality origin.

    • Main Results:

    • The study demonstrates that D-type tRNA can recognize L-type amino acids through specific base interactions.
    • An exception is noted where D-type tyrosine can be recognized by D-type tRNA, as evidenced by Calender and Berg's work.
    • This stereochemical recognition provides a plausible molecular basis for the origin of homochirality.

    Conclusions:

    • The stereochemical interactions between tRNA and amino acids offer a compelling explanation for the origin of molecular chirality.
    • This model provides a scientific advantage over the 'frozen accident' theory by proposing a specific mechanism.
    • The findings contribute to understanding the fundamental molecular processes that led to life as we know it.