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A continuous fluorimetric assay for ATPase activity.

U Banik1, S Roy

  • 1Department of Biophysics, Bose Institute, Calcutta, India.

The Biochemical Journal
|March 1, 1990
PubMed
Summary
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A novel continuous fluorimetric assay enables the measurement of ATPase activity by monitoring phosphate release. This method uses 7-methylguanosine and nucleoside phosphorylase for sensitive detection of ATP hydrolysis.

Area of Science:

  • Biochemistry
  • Enzyme kinetics
  • Analytical chemistry

Background:

  • Assays for adenosine triphosphatases (ATPases) are crucial for studying cellular energy metabolism.
  • Existing methods may lack continuous monitoring capabilities or require complex procedures.
  • A need exists for a versatile and sensitive assay for ATPase activity.

Purpose of the Study:

  • To develop a new, continuous coupled fluorimetric assay for general ATPase activity.
  • To establish a method for sensitive and real-time monitoring of adenosine triphosphate (ATP) hydrolysis.

Main Methods:

  • A continuous coupled fluorimetric assay was designed.
  • Phosphate released from ATP hydrolysis was coupled to the nucleoside phosphorylase reaction.
  • 7-methylguanosine served as a fluorescent substrate, with its hydrolysis product (7-methylguanine) exhibiting a lower quantum yield.

Related Experiment Videos

Main Results:

  • The assay allows for continuous monitoring of ATP hydrolysis.
  • The decrease in fluorescence due to 7-methylguanine formation quantifies ATPase activity.
  • The method demonstrated sensitivity in detecting phosphate release.

Conclusions:

  • A novel continuous coupled fluorimetric assay for ATPases has been successfully developed.
  • This assay provides a sensitive and adaptable tool for studying enzymes involved in ATP hydrolysis.
  • The method shows potential for extension to other nucleotidases, such as GTPases and nucleotidyltransferases.