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Nucleotide binding by multienzyme peptide synthetases

M Pavela-Vrancic1, H Van Liempt, E Pfeifer

  • 1Institut für Biochemie und Molekulare Biologie, Technische Universität Berlin, Germany.

European Journal of Biochemistry
|March 1, 1994
PubMed
Summary
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Peptide synthetases utilize distinct nucleotide binding sites, differing from aminoacyl-tRNA synthetases. These findings aid in identifying peptide synthetases in protein mixtures.

Area of Science:

  • Biochemistry
  • Enzymology
  • Molecular Biology

Background:

  • Peptide synthetases feature linearly arranged catalytic units with conserved amino acid-activating segments.
  • Sequence analysis reveals novel motifs in peptide synthetases, distinct from aminoacyl-tRNA synthetases.
  • Understanding nucleotide substrate interactions is crucial for characterizing these enzymes.

Purpose of the Study:

  • To investigate the catalytic properties of peptide synthetases concerning nucleotide substrates.
  • To differentiate peptide synthetases from aminoacyl-tRNA synthetases based on substrate specificity.
  • To identify potential alternative substrates for detecting peptide synthetases.

Main Methods:

  • Enzyme kinetic studies were employed to analyze substrate and inhibitor interactions.

Related Experiment Videos

  • The use of adenosine triphosphate (ATP) analogues, including 2'-deoxy-ATP (dATP) and 7-deazaadenosine 5'-triphosphate, was investigated.
  • Kinetic analysis of coenzyme A inhibition was performed.

    • Main Results:

    • Peptide synthetases accept ATP analogues like dATP and 7-deazaadenosine 5'-triphosphate, unlike many aminoacyl-tRNA synthetases.
    • Substrate binding indicates a preference for the anti-conformation.
    • Coenzyme A acts as a non-competitive inhibitor, suggesting a secondary nucleotide binding site.

    Conclusions:

    • Peptide synthetases possess a unique substrate and inhibition profile compared to aminoacyl-tRNA synthetases.
    • These enzymes represent a distinct family of carboxyl-activating enzymes.
    • The identified substrate specificities can aid in the detection of peptide synthetases in complex biological samples.