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Interaction of puromycin with acceptor site of human placenta 80 S ribosomes

D M Graifer1, O S Fedorova, G G Karpova

  • 1Institute of Bioorganic Chemistry, Siberian Division of the USSR Academy of Sciences, Novosibirsk.

FEBS Letters
|December 17, 1990
PubMed

Insights

This study investigated puromycin binding to human placental ribosomes. The association constant for puromycin at the ribosome acceptor site was determined to be approximately 4 x 10^4 M^-1.

Area of Science:

  • Molecular Biology
  • Biochemistry
  • Human Placenta Research

Background:

  • Ribosomes are essential for protein synthesis.
  • Puromycin is an antibiotic that inhibits translation.
  • Understanding drug-ribosome interactions is crucial for developing new therapeutics.

Purpose of the Study:

  • To determine the binding affinity of puromycin to the human placental 80S ribosome.
  • To investigate the kinetics of N-acetylphenylalanyl-puromycin formation.

Main Methods:

  • Treatment of human placental 80S ribosomes with N-AcPhe-tRNA(Phe) and poly(U).
  • Incubation with varying concentrations of puromycin.
  • Kinetic analysis of N-acetylphenylalanyl-puromycin formation.

Main Results:

  • The association constant of puromycin with the ribosome acceptor site was estimated.
  • The calculated association constant was (3.96 +/- 0.84) x 10^4 M^-1 at 37°C.

Conclusions:

  • Puromycin exhibits a moderate binding affinity to the human placental ribosome acceptor site.
  • This quantitative data provides insights into the mechanism of translation inhibition by puromycin.

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