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Tandem Mass Spectrometry01:21

Tandem Mass Spectrometry

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Tandem mass spectrometry is a technique that uses multiple mass analyzers in series to obtain a higher selectivity and signal-to-noise ratio for the analyte. Instruments with multiple analyzers separated by an interaction cell enable secondary fragmentation and selected study of the fragment ions.
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Tandem mass spectrometry, also known as MS/MS or MS2, is an analytical technique that employs two mass analyzers. Essentially it is a series of mass spectrometers that helps isolate a particular biomolecule and then helps study its chemical properties.
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Mass spectrometry is an important technique for the identification of pure compounds. However, it has some limitations for the analysis of complex mixtures, often due to excessive fragmentation making the spectrum too complicated to decipher. Mass spectrometry can be combined with suitable separation methods in sequence, forming hyphenated methods, which are useful in the analysis of complex mixtures.
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The ionization of a molecule into a molecular ion inside the mass spectrometer causes instability in the molecule's structure due to the loss of an electron. This eventually leads to the fragmentation or breaking of some bonds in the molecule. The fragmentation occurs predominantly at specific bonds to yield relatively stable fragments.
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Mass spectrometry is an analytical technique used to determine the molecular mass and molecular formula of a compound. The basic principle of mass spectrometry is to generate ions from the analyte molecule and measure these ion abundances against their molecular mass.  One common type of ionization, known as electrospray ionization or EI, bombards the analyte molecules in the gas phase with high-energy electron beams. The electron beams displace an electron from the molecule and leave...
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This lesson details the instrumentation of a mass spectrometer—a physical instrument to perform mass spectrometry on analyte molecules and record the characteristic mass spectra. This is achieved via three chief functions:
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Increasing Top-Down Mass Spectrometry Sequence Coverage by an Order of Magnitude through Optimized Internal Fragment

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Area of Science:

  • Proteomics
  • Mass Spectrometry
  • Biochemistry

Background:

  • Intact protein fragmentation methods often lack sequence coverage in protein interiors.
  • Disulfide loop regions within proteins are challenging to characterize using traditional terminal fragments.

Purpose of the Study:

  • To develop and optimize methods for generating and assigning internal fragments from intact proteins.
  • To address and mitigate "frameshift ambiguity" in internal fragment identification.

Main Methods:

  • Investigated the impact of protein size, mass accuracy, fragment size, CAD activation energy, and data preprocessing on internal fragment generation.
  • Developed strategies to resolve "frameshift ambiguity" using accurate mass, fragmentation propensities, and (pseudo)-MS3.

Main Results:

  • Achieved unambiguous assignment of over 97% of internal fragments using accurate mass.
  • Demonstrated a 10-fold and 43-fold increase in identified ions for native and reduced SOD1 variants, respectively.
  • Showed a 7-fold and 16-fold increase in fragmentation sites for native and reduced SOD1 variants.

Conclusions:

  • Optimized CAD methods significantly expand sequence coverage in intact protein analysis.
  • The developed strategies enable unambiguous identification of internal protein fragments, enhancing proteomic analysis capabilities.