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Tandem Mass Spectrometry01:21

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Tandem mass spectrometry is a technique that uses multiple mass analyzers in series to obtain a higher selectivity and reduce chemical noise during analyte detection. Instruments with multiple analyzers separated by an interaction cell enable secondary fragmentation and selected study of the fragment ions.Secondary fragmentations occur in the interaction cell and can be induced by various factors. Fragmentation induced by collision with inert gases, such as N2, Ar, He, etc., is called...
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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 electron 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 behind a...
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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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The resolution of a mass spectrometer depends on the efficiency of separating ions with different ion masses. The mass of an atom is approximated to the sum of the masses of protons and neutrons inside, considering the masses of protons and neutrons as equal. However, the masses of the proton (1.6726 × 10−24 g) and neutron (1.6749 × 10−24 g) are not truly equal. There is a minor error in the expression of atomic masses relative to the simplest atom of hydrogen. For...
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Probing allosteric mechanisms using native mass spectrometry.

Michal Sharon1, Amnon Horovitz2

  • 1Department of Biological Chemistry, Weizmann Institute of Science, Rehovot 7610001, Israel.

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Summary
This summary is machine-generated.

Native mass spectrometry (MS) and ion mobility MS enable the discrimination of allosteric mechanisms. These techniques offer powerful insights into ligand binding, protein oligomerization, and conformational changes in complex biological systems.

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Area of Science:

  • Biochemistry
  • Biophysics
  • Analytical Chemistry

Background:

  • Allosteric mechanisms are crucial for biological regulation but challenging to study with traditional methods.
  • Ensemble measurements in bulk solutions often lack the resolution to distinguish between different allosteric models.

Purpose of the Study:

  • To demonstrate how native mass spectrometry (MS) and ion mobility MS can differentiate complex allosteric mechanisms.
  • To highlight the utility of these techniques for studying ligand binding and protein dynamics.

Main Methods:

  • Utilizing native MS to measure intact assemblies and determine ligand binding constants for multimeric proteins.
  • Employing ion mobility MS to analyze rotationally averaged cross-section areas of protein complexes.
  • Applying these methods to distinguish between concerted and sequential allosteric models and conformational selection versus induced fit.

Main Results:

  • Native MS successfully determined binding constants, aiding in the differentiation of allosteric models.
  • Ion mobility MS provided structural information to distinguish between conformational selection and induced fit mechanisms.
  • Ligand-modulated protein oligomerization and cooperativity were effectively studied.

Conclusions:

  • Native MS and ion mobility MS are powerful, complementary tools for dissecting complex allosteric mechanisms.
  • These techniques offer high resolution for studying protein-ligand interactions and conformational dynamics.
  • The application of native MS and allied techniques is expanding the understanding of allosteric regulation.