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Activation of bacterial ribonuclease P by macrolides

Chrisavgi Toumpeki1, Anastassios Vourekas, Dimitra Kalavrizioti

  • 1Department of Biochemistry, School of Medicine, University of Patras, 26500 Patras, Greece.

Biochemistry
|March 12, 2008
PubMed

Insights

The macrolide antibiotic spiramycin enhances the activity of Ribonuclease P (RNase P) holoenzyme and M1 RNA in Escherichia coli. This antibiotic improves pre-tRNA cleavage, aiding in tRNA maturation.

Area of Science:

  • Molecular Biology
  • Biochemistry
  • Microbiology

Background:

  • Ribonuclease P (RNase P) is a crucial ribozyme for tRNA maturation.
  • RNase P holoenzyme and its catalytic M1 RNA component from Escherichia coli are essential for this process.

Purpose of the Study:

  • To investigate the effect of the macrolide antibiotic spiramycin on RNase P holoenzyme and M1 RNA activity.
  • To determine how spiramycin influences the catalytic efficiency of RNase P in pre-tRNA cleavage.

Main Methods:

  • Kinetic analysis using primary and secondary plots to determine kinetic parameters (K s, V max, K s(app), V max(app)).
  • Primer extension analysis to assess conformational changes in M1 RNA.

Main Results:

  • Spiramycin demonstrated a dose-dependent activation of pre-tRNA cleavage by both E. coli RNase P holoenzyme and M1 RNA.
  • The activity of RNase P holoenzyme and M1 RNA was enhanced 18-fold and 12-fold, respectively, in the presence of spiramycin.
  • Spiramycin induced a conformational change in the P10/11 structural element of M1 RNA, which is critical for substrate recognition.

Conclusions:

  • Spiramycin acts as a potent activator of E. coli RNase P holoenzyme and M1 RNA.
  • The antibiotic's mechanism involves inducing conformational changes in M1 RNA, thereby enhancing substrate binding and catalytic efficiency.
  • These findings suggest a novel regulatory role for spiramycin in tRNA biogenesis.

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