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Related Concept Videos

Protein Digestion01:02

Protein Digestion

Protein digestion begins in the stomach, where the highly acidic environment can easily disrupt protein structure by exposing the peptide bonds of polypeptide chains. After polypeptide chains are broken into individual amino acids by a series of digestive enzymes, the amino acids are transported to the liver via the bloodstream to produce energy.

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Related Experiment Video

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Deep Proteome Profiling by Isobaric Labeling, Extensive Liquid Chromatography, Mass Spectrometry, and Software-assisted Quantification
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Optimization of digestion parameters for protein quantification.

Jessica Norrgran1, Tracie L Williams, Adrian R Woolfitt

  • 1Division of Laboratory Sciences, National Center for Environmental Health, Centers for Disease Control and Prevention, 4770 Buford Highway, MS F-50, Atlanta, GA 30341, USA.

Analytical Biochemistry
|June 9, 2009
PubMed
Summary
This summary is machine-generated.

This study introduces a fast, in-solution enzymatic digestion method for mass spectrometry protein quantification. The optimized protocol uses RapiGest SF and trypsin for efficient protein analysis without reduction or alkylation.

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Area of Science:

  • Biochemistry
  • Analytical Chemistry
  • Proteomics

Background:

  • Accurate protein quantification is crucial in biological research.
  • Existing enzymatic digestion protocols can be time-consuming and complex.
  • There is a need for rapid and efficient methods for mass spectrometry-based protein analysis.

Purpose of the Study:

  • To develop and optimize a rapid, in-solution enzymatic digestion protocol.
  • To enhance the efficiency of protein digestion for mass spectrometry-based absolute protein quantification.
  • To demonstrate the general applicability of the optimized protocol using model proteins.

Main Methods:

  • Systematic optimization of digestion parameters including incubation time, RapiGest SF concentration, enzyme-to-substrate ratio, and temperature.
  • Utilized an acid-labile surfactant (RapiGest SF) and modified trypsin.
  • No reduction or alkylation reagents were employed.
  • Analysis performed using liquid chromatography-tandem mass spectrometry (LC-MS/MS) in multiple reaction monitoring (MRM) mode with isotopically labeled peptide standards.

Main Results:

  • Achieved efficient protein digestion within a 2-hour incubation period.
  • Identified optimal conditions for enzyme-to-substrate ratio (2.5:1) and RapiGest SF concentration.
  • Demonstrated successful application of the protocol to viral hemagglutinin (HA) and ricin proteins.
  • Validated the method's performance through comparison of peptide yields from different protein sites.

Conclusions:

  • The developed in-solution enzymatic digestion protocol is rapid, efficient, and suitable for mass spectrometry-based absolute protein quantification.
  • The protocol simplifies sample preparation by eliminating the need for reduction and alkylation steps.
  • This method offers a valuable tool for high-throughput proteomics and biomarker discovery.