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Related Experiment Videos

Does PAPS generation determine the overall sulfate conjugation in human platelets?

B Y Khoo1, K H Sit, K P Wong

  • 1Department of Biochemistry, Faculty of Medicine, National University of Singapore.

Life Sciences
|January 1, 1988
PubMed
Summary

This study quantifies 3'-phospho-adenosine-5'phosphosulfate (PAPS) generation in human platelets. PAPS generation strongly correlates with N-acetyldopamine sulfate conjugation, a key metabolic pathway.

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Area of Science:

  • Biochemistry
  • Enzymology
  • Human Physiology

Background:

  • 3 '-phospho-adenosine-5'phosphosulfate (PAPS) is crucial for sulfate conjugation.
  • PAPS synthesis involves ATP-sulfurylase and APS-kinase.
  • Platelets are a source of PAPS-generating enzymes.

Purpose of the Study:

  • To quantify PAPS generation in human platelets.
  • To establish a correlation between PAPS generation and N-acetyldopamine (NADA) sulfate conjugation.

Main Methods:

  • PAPS generation measured via 35S transfer from PAP35S to NADA.
  • Phenolsulfotransferase from rat liver used, with sulfate-activating system inhibited by EDTA and pyrophosphate.
  • Optimized reaction conditions included pH, ATP, and Mg++ concentrations.

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Main Results:

  • Human platelet PAPS generation showed two pH optima (pH 6 and pH 8).
  • Optimal ATP and Mg++ concentrations were determined to be 7 mM.
  • A strong positive correlation (r=0.96) was found between PAPS generation and NADA sulfate conjugation.

Conclusions:

  • A reliable method for quantifying PAPS generation in human platelets was developed.
  • Platelet PAPS generation is closely linked to the overall sulfate conjugation capacity.
  • This assay has potential applications in studying sulfate metabolism and related disorders.