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Mass Spectrometry: Overview01:19

Mass Spectrometry: Overview

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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 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 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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High-Resolution Mass Spectrometry (HRMS)01:15

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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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Higher molecular weight biomolecules are nonvolatile compounds that may decompose before ionizing or vaporizing during mass analysis with conventional electron impact ionization methods. Accordingly, electrospray ionization (ESI) is the favored method for vaporizing and ionizing biomolecules as it circumvents rapid fragmentation and enables the recording of mass signals for the entire biomolecule.
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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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Structural insights into the EthR-DNA interaction using native mass spectrometry.

Daniel Shiu-Hin Chan1, Wei-Guang Seetoh1, Brendan N McConnell1

  • 1Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB21EW, UK. ca26@cam.ac.uk.

Chemical Communications (Cambridge, England)
|March 14, 2017
PubMed
Summary
This summary is machine-generated.

EthR is a transcriptional repressor that confers Mycobacterium tuberculosis resistance to ethionamide. This study used native mass spectrometry to reveal that multiple EthR subunits can bind to its DNA operator.

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Area of Science:

  • Microbiology
  • Biochemistry
  • Structural Biology

Background:

  • Ethionamide is a crucial drug for treating Mycobacterium tuberculosis infections.
  • EthR is a transcriptional repressor that mediates resistance to ethionamide in M. tuberculosis.
  • Understanding EthR-DNA interactions is key to developing strategies against drug-resistant tuberculosis.

Purpose of the Study:

  • To investigate the EthR-DNA interaction for the first time.
  • To characterize the binding stoichiometry of EthR to its operator DNA.
  • To provide insights into the molecular mechanisms of ethionamide resistance.

Main Methods:

  • Native electrospray-ionization mass spectrometry (native ESI-MS) was employed.
  • The study focused on the interaction between the EthR protein and its specific DNA operator sequence.

Main Results:

  • Native ESI-MS successfully characterized the EthR-DNA complex.
  • Results demonstrated that up to six subunits of EthR can bind to its operator DNA.
  • This oligomeric binding suggests a complex regulatory mechanism.

Conclusions:

  • The study provides the first direct evidence of EthR-DNA complex formation using native MS.
  • The observed multi-subunit binding of EthR to its operator has significant implications for transcriptional regulation.
  • These findings contribute to understanding ethionamide resistance in Mycobacterium tuberculosis and may inform future therapeutic approaches.