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Related Experiment Videos

Self-catalysed affinity labeling of Q beta replicase.

A J Lindner1, S J Glaser, C K Biebricher

  • 1Institut für Biochemie, Ludwig-Maximilians-Universität, München, Federal Republic of Germany.

European Journal of Biochemistry
|December 5, 1991
PubMed
Summary

Researchers selectively modified the active site of Q beta replicase using self-catalyzed affinity labeling. The nucleotide binding site was mapped to a specific region on the beta subunit, identifying Lys95 as the likely modified amino acid.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Enzymology

Background:

  • Q beta replicase is a key enzyme in RNA replication.
  • Understanding its active site is crucial for studying viral processes.
  • Selective modification techniques are needed to probe enzyme structure and function.

Purpose of the Study:

  • To investigate the spatial neighborhood of the Q beta replicase active center.
  • To identify the specific amino acid residues involved in nucleotide binding.
  • To map the location of the active site on the enzyme's beta subunit.

Main Methods:

  • Employing self-catalyzed affinity labeling to modify the enzyme's active center.
  • Utilizing template-directed, intramolecular enzymatic catalysis with [32P]GpG.

Related Experiment Videos

  • Performing limited polypeptide digestion with cyanogen bromide and N-chlorosuccinimide.

    • Main Results:

    • The product [32P]GpG specifically attached to the beta subunit of Q beta replicase.
    • The attachment site was mapped to the region between Trp93 and Met130 on the beta subunit.
    • Lysine 95 (Lys95) was identified as the most likely amino acid to be modified.

    Conclusions:

    • Self-catalyzed affinity labeling effectively probes the Q beta replicase active center.
    • The nucleotide binding site is located within the Trp93-Met130 region of the beta subunit.
    • Lys95 is suggested to be in close proximity to the nucleotide binding site within the active center.