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Related Experiment Videos

Hydrogen peroxide yields mechanistic insights into human mRNA capping enzyme function.

Nicholas J Mullen1, David H Price1

  • 1Department of Biochemistry, University of Iowa, Iowa City, Iowa, United States of America.

Plos One
|October 14, 2017
PubMed
Summary

A novel factor regulates human capping enzyme (HCE) activity, specifically targeting guanylyltransferase. Hydrogen peroxide inhibits HCE by oxidizing its triphosphatase domain, revealing a regulated capping mechanism for RNA polymerase II transcripts.

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Area of Science:

  • Molecular Biology
  • Biochemistry
  • Gene Expression Regulation

Background:

  • Nascent RNA polymerase II (Pol II) transcript capping is essential for gene expression.
  • Human capping enzyme (HCE) possesses distinct 5' triphosphatase and guanylyltransferase activities.
  • Coordination of these HCE activities during co-transcriptional capping remains unclear.

Purpose of the Study:

  • To investigate the coordination of HCE activities during transcript capping.
  • To identify factors modulating the minimum transcript length for capping.
  • To elucidate the mechanism of HCE inhibition by hydrogen peroxide.

Main Methods:

  • Utilized a well-established in vitro capping system with hydrogen peroxide as an inhibitor.
  • Employed mass spectrometry to analyze HCE modifications.

Related Experiment Videos

  • Used recombinant proteins of separated HCE domains to assess individual activities.

    • Main Results:

    • An unidentified factor was found to specifically target the guanylyltransferase activity of HCE.
    • Hydrogen peroxide inhibits HCE by oxidizing the active site cysteine of the triphosphatase domain.
    • Evidence suggests the triphosphatase acts on shorter transcripts than the guanylyltransferase.

    Conclusions:

    • The study reveals a novel regulatory mechanism for HCE activity involving an unidentified factor and transcript length.
    • The findings uncover the molecular basis of HCE inhibition by hydrogen peroxide.
    • The results suggest that the capping process is tightly regulated, potentially influencing gene expression.