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Effect of magnesium ions on the thermal stability of human poly(A)-specific ribonuclease

Wei-Feng Liu1, Ao Zhang, Yuan Cheng

  • 1State Key Laboratory of Biomembrane and Membrane Biotechnology, Department of Biological Sciences and Biotechnology, Tsinghua University, Beijing 100084, China.

FEBS Letters
|February 20, 2007
PubMed

Insights

Magnesium ions (Mg2+) uniquely protect Poly(A)-specific ribonuclease (PARN) from heat inactivation. However, high temperatures with Mg2+ can promote PARN unfolding and aggregation, indicating dual effects on enzyme stability.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Enzymology

Background:

  • Poly(A)-specific ribonuclease (PARN) is a crucial enzyme in mRNA deadenylation in eukaryotes.
  • PARN belongs to the DEDD family of enzymes.

Purpose of the Study:

  • To investigate the effect of Mg(2+) on the thermal stability of PARN.
  • To elucidate the protective mechanisms and potential detrimental effects of Mg(2+) on PARN.

Main Methods:

  • Thermal inactivation assays were performed on PARN in the presence of varying Mg(2+) concentrations.
  • Changes in inactivation midpoint and rate were analyzed.
  • Thermal unfolding and aggregation were monitored at high temperatures with Mg(2+) addition.

Main Results:

  • Mg(2+) protected PARN against thermal inactivation in a concentration-dependent manner, increasing the inactivation midpoint and decreasing the inactivation rate.
  • Conversely, Mg(2+) promoted thermal unfolding and aggregation of PARN at high temperatures.
  • These findings suggest a dual role for Mg(2+) in modulating PARN stability.

Conclusions:

  • Mg(2+) exhibits a protective effect on the active site of PARN, enhancing its thermal stability.
  • However, Mg(2+) can compromise the overall structural integrity of PARN at elevated temperatures.
  • The study highlights the complex, concentration-dependent influence of Mg(2+) on PARN stability.

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