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Enzyme-Linked Immunosorbent Assay01:33

Enzyme-Linked Immunosorbent Assay

In 1971, Peter Perlman and Eva Engvall developed an Enzyme-linked immunosorbent assay (ELISA or EIA). ELISA differs from western blot in that the assays are conducted in microtiter plates or in vivo rather than on an absorbent membrane.
There are many different types of ELISAs, but they all involve an antibody molecule whose constant region binds an enzyme, leaving the variable region free to bind its specific antigen.  Enzyme-substrate reaction allows the antigen to be visualized or quantified.

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Assays using a NIMS chip: loosely bound but highly selective.

J Li1, R H Lipson

  • 1Department of Chemistry, University of Victoria, Stn CSC, Victoria, BC, Canada.

Analytical Chemistry
|June 19, 2013
PubMed
Summary

A novel fluorous-affinity nanostructure initiator mass spectrometry (NIMS) chip enables enzyme activity assays. This technology was validated for detecting peptide phosphorylation and screening enzyme inhibitors, showing potential for high-throughput analysis.

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Area of Science:

  • Biochemistry
  • Analytical Chemistry
  • Biotechnology

Background:

  • Enzyme activity assays are crucial for understanding biological processes and drug discovery.
  • Existing methods can be limited in sensitivity, throughput, or scope.
  • Nanostructure initiator mass spectrometry (NIMS) offers a sensitive platform for molecular detection.

Purpose of the Study:

  • To develop and validate a fluorous-affinity NIMS chip for enzyme activity assays.
  • To demonstrate its application in detecting peptide phosphorylation by protein kinase A (PKA).
  • To explore its utility as a platform for enzyme inhibition screening.

Main Methods:

  • Fabrication of a fluorous-affinity NIMS chip.
  • Design of an assay for PKA-mediated phosphorylation of cysteine-containing peptides.
  • Characterization of enzyme inhibition using known inhibitors.
  • Derivation of IC50 values from substrate-to-product signal ratios.

Main Results:

  • Successful development of a NIMS chip for enzyme assays.
  • Demonstrated detection of PKA activity and peptide phosphorylation.
  • Quantification of enzyme inhibition with accurate IC50 values for PKA and Abl kinase.
  • Exploration of multiplexed inhibition screening capabilities.

Conclusions:

  • The fluorous-affinity NIMS chip is a viable tool for sensitive enzyme activity and inhibition assays.
  • This technology holds promise for high-throughput screening of enzyme inhibitors.
  • NIMS offers a versatile platform for biochemical analysis and drug discovery.