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Mass Spectrometry: Overview01:19

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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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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 fragmentation patterns observed for compounds such as carboxylic acids, esters, and amides in the mass spectra include ⍺-cleavage and McLafferty rearrangement. Fragmentation by ⍺-cleavage preferentially occurs at the carbon-carbon bond at the ⍺-position next to the carboxylic group to generate a neutral radical and a cation. Long chain compounds with hydrogen at their γ-carbon undergo McLafferty rearrangement to give a radical cation and a neutral alkene.
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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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Updated: Sep 16, 2025

Time-resolved ElectroSpray Ionization Hydrogen-deuterium Exchange Mass Spectrometry for Studying Protein Structure and Dynamics
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Protein Structural Characterization Using Electron Transfer Dissociation and Hydrogen Exchange-Mass Spectrometry.

Rupam Bhattacharjee1, Jayant B Udgaonkar2

  • 1National Centre for Biological Sciences, Tata Institute of Fundamental Research, Bengaluru, India.

Bio-Protocol
|July 7, 2025
PubMed
Summary

Detecting transient protein intermediate states is challenging. Hydrogen exchange-electron transfer dissociation mass spectrometry (HX-ETD-MS) provides high-resolution structural insights into these short-lived species during protein folding and unfolding.

Keywords:
Back-exchangeCooperativeDeuteriumGlobal fittingIntermediateKineticsNon-cooperative

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Area of Science:

  • Biochemistry and Structural Biology
  • Mass Spectrometry Applications
  • Protein Dynamics

Background:

  • Protein folding and unfolding involve transient intermediate states that are difficult to detect and structurally characterize.
  • Traditional methods like enzymatic digestion coupled with Hydrogen Exchange (HX) are limited when proteins inhibit proteases.
  • High-resolution techniques are essential for understanding the dynamics of these short-lived intermediates.

Purpose of the Study:

  • To present Hydrogen Exchange-Electron Transfer Dissociation Mass Spectrometry (HX-ETD-MS) as a robust method for studying protein folding/unfolding intermediates.
  • To demonstrate the capability of HX-ETD-MS in providing segment-specific structural information.
  • To highlight the advantages of HX-ETD-MS over conventional methods for analyzing protease-resistant proteins.

Main Methods:

  • Utilizing Hydrogen Exchange (HX) to label protein backbone deuterium uptake.
  • Employing Electron Transfer Dissociation (ETD) for fragmentation of labeled proteins within the mass spectrometer.
  • Analyzing deuterium retention in protein fragments to map structural changes during folding/unfolding.

Main Results:

  • HX-ETD-MS successfully identifies intermediate states in protein folding/unfolding, even under native conditions.
  • The method distinguishes between cooperative and non-cooperative unfolding transitions.
  • Sequence-specific structural changes occurring during folding/unfolding can be determined with minimal deuterium scrambling.

Conclusions:

  • HX-ETD-MS is a powerful technique for structural characterization of transient protein intermediates.
  • This method overcomes limitations of enzymatic digestion for protease-inhibiting proteins.
  • HX-ETD-MS offers detailed insights into the dynamics and cooperativity of protein folding and unfolding processes.