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Mass Spectrometry: Complex Analysis01:21

Mass Spectrometry: Complex Analysis

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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 quadrupole mass analyzer consists of four cylindrical metal rods arranged in a diamond carrying a DC voltage and a radio-frequency AC voltage. The motion of ions through the quadrupole depends on the field strength, causing only ions of a certain m/z to resonate successfully and strike the detector at a given field strength. Though the transmission rate for these analyzers is high, the exact elemental composition of the sample is not determined because of low resolution; however, they are...
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An unknown compound can be established by identifying the molecular ion peak in the mass spectrum. The molecular ion peak is often weak or absent due to the predominance of fragmentation in high-energy electron beams. In such cases, a soft-energy electron beam can be used to scan the spectrum to enhance the intensity of the molecular ion peak. Additionally, chemical ionization, field ionization, and desorption ionization spectra are used to obtain a relatively intense molecular ion peak.To...
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At room temperature, the chair conformer of cyclohexane undergoes rapid ring flipping between two equivalent chair conformers at a rate of approximately 105 times per second. These two chair conformers are in equilibrium. The rapid ring flipping results in the interconversion of the axial proton to an equatorial proton and an equatorial to the axial proton. Such interconversions are too rapid and cannot be detected on the NMR timescale. Hence, the NMR spectrometer cannot distinguish between the...
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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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Single-molecule Manipulation of G-quadruplexes by Magnetic Tweezers
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Exploring RNA G-Quadruplex Stability in the Gas Phase: Insights from Native Mass Spectrometry.

Anna Ploner1, Sarah Viola Heel1, Kathrin Breuker1

  • 1Institute of Organic Chemistry and Center for Molecular Biosciences Innsbruck (CMBI), University of Innsbruck, Innsbruck, Austria.

Chempluschem
|December 10, 2025
PubMed
Summary

Native mass spectrometry (MS) reveals that stable ribonucleic acid (RNA) G-quadruplex structures in solution maintain their integrity in the gas phase. This finding holds true regardless of ion charge, offering insights into RNA structural analysis.

Keywords:
RNAcollisionally activated dissociationnative mass spectrometryquadruplex

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Area of Science:

  • Biophysical Chemistry
  • Structural Biology
  • Mass Spectrometry

Background:

  • Native mass spectrometry (MS) is emerging as a powerful tool for studying ribonucleic acid (RNA) structure and interactions.
  • Understanding the stability of RNA structural elements, like G-quadruplexes, during gas-phase ion formation is crucial but not well understood.
  • Electrospray ionization (ESI), a common MS technique, often yields RNA ions with a broad range of charges, complicating structural interpretation.

Purpose of the Study:

  • To investigate the gas-phase stability of RNA G-quadruplex structures using native MS.
  • To correlate solution-phase stability with gas-phase stability of RNA G-quadruplexes.
  • To examine the influence of central cations (K+, NH4+) and ion net charge on G-quadruplex stability in the gas phase.

Main Methods:

  • Studied two tetramolecular RNA G-quadruplexes with differing solution stabilities using native MS.
  • Analyzed ion abundance ratios (quadruplex vs. monomer) in electrospray ionization (ESI) spectra.
  • Employed collisionally activated dissociation (CAD) to probe the stability of gaseous RNA G-quadruplex ions.

Main Results:

  • Higher solution stability of RNA G-quadruplexes correlated with a higher ratio of quadruplex to monomer ions in ESI spectra, irrespective of ion charge.
  • Gas-phase stability, assessed by CAD, showed that G-quadruplexes more stable in solution were also more stable in the gas phase for both K+ and NH4+ cations.
  • For K+-bound quadruplex ions, stability decreased with increasing net charge due to Coulombic repulsion; covalent bond cleavage occurred before strand separation at lower dissociation energies for low-charge states.

Conclusions:

  • Native MS can effectively analyze RNA G-quadruplex structures, with solution stability being a key determinant of gas-phase stability.
  • The charge state of RNA ions influences their stability in the gas phase, a factor to consider in MS-based structural studies.
  • This work provides critical insights into the behavior of RNA G-quadruplexes under MS conditions, advancing their use in structural biology.