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Structural requirements for a primitive adaptor molecule.

G Raghunathan1, R Rein

  • 1Department of Biophysics, Roswell Park Memorial Institute, Buffalo, New York 14263.

Journal of Biomolecular Structure & Dynamics
|June 1, 1987
PubMed
Summary
This summary is machine-generated.

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Linear hairpin helices cannot facilitate both messenger reading and peptide formation. The study suggests early adaptor molecules, like modern transfer RNAs (tRNAs), required an "L" shape for function.

Area of Science:

  • Molecular Biology
  • Origin of Life Research
  • Biochemistry

Background:

  • Transfer RNAs (tRNAs) are crucial molecules in protein synthesis, acting as adaptors between messenger RNA (mRNA) codons and amino acids.
  • The three-dimensional structure of tRNAs, particularly their 'L' shape, is essential for their function in the ribosome.
  • Understanding the evolutionary origins of tRNA structure and function is key to deciphering early molecular evolution.

Purpose of the Study:

  • To investigate the functional capabilities of linear hairpin helices as primitive adaptor molecules.
  • To determine if linear hairpin structures could support both mRNA decoding and amino acid activation for peptide bond formation.
  • To infer the structural requirements of ancestral adaptor molecules based on modern tRNA structure-function relationships.

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Main Methods:

  • Theoretical analysis of the geometric and chemical constraints of linear hairpin helices.
  • Comparison of hypothetical linear hairpin adaptor models with the established model of the modern peptidyl transfer intermediate.
  • Evaluation of the proposed 'L' shape folding of present-day tRNAs as a prerequisite for adaptor function.

Main Results:

  • Neither right-handed nor left-handed linear hairpin helices can simultaneously perform the dual roles of reading a comma-free messenger and aligning aminoacyl residues for peptide condensation.
  • The analysis indicates significant limitations of linear structures in fulfilling the requirements of early adaptor molecules.
  • The 'L' shaped folding characteristic of modern tRNAs appears to be a necessary feature for efficient adaptor function.

Conclusions:

  • Ancestral adaptor molecules likely possessed structural features similar to modern tRNAs, including a three-dimensional 'L' shaped conformation.
  • The evolution of the 'L' shape was a critical step in the development of efficient protein synthesis.
  • Linear hairpin structures are unlikely to have served as functional adaptors in the early stages of molecular evolution.