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Terbium(III) Luminescence-Based Assay for Esterase Activity.

Kenton J Hetrick1,2, Miguel A Aguilar Ramos1, Ronald T Raines1,2

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This study introduces a novel assay for esterase activity using thiopheneacetic acid esters and terbium(III) luminescence. This method effectively monitors esterase specificity for aliphatic esters at low concentrations.

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Area of Science:

  • Biochemistry
  • Enzymology
  • Analytical Chemistry

Background:

  • Esterases are crucial enzymes involved in xenobiotic detoxification and drug metabolism.
  • Existing esterase activity assays are limited by their reliance on aromatic alcohol or acid substrates.
  • The specificity of esterases towards aliphatic esters remains largely unexplored due to assay limitations.

Purpose of the Study:

  • To develop a novel continuous assay for monitoring esterase activity.
  • To investigate esterase specificity for aliphatic esters.
  • To characterize esterase kinetics using a new probe system.

Main Methods:

  • Utilized esters of thiopheneacetic acid coupled with terbium(III) luminescence.
  • Developed a continuous assay for real-time monitoring of ester hydrolysis.
  • Determined steady-state kinetic parameters for pig liver esterase.

Main Results:

  • The novel probe allows for wide variation of the alcohol moiety in ester substrates.
  • Hydrolysis of thiopheneacetic acid esters was detected at submicromolar concentrations.
  • The assay successfully characterized kinetic parameters for purified and unpurified esterases.

Conclusions:

  • This terbium(III)-based assay provides a versatile tool for studying esterase activity, particularly for aliphatic esters.
  • The method is sensitive and applicable to various biological samples, including cell lysates.
  • Offers new insights into esterase substrate specificity and enzyme kinetics.