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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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Most elements exist in nature as a mixture of isotopes. The isotopes differ in weight due to their respective number of neutrons. The molecular weight of a molecule is different depending on the specific isotope of its elements involved. As a result, the mass spectrum of the molecule exhibits peaks from the same fragment at multiple positions. The positions of these mass signals depend on the mass differences between isotopes. Furthermore, the intensity of these signals is dependent on the...
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In mass spectroscopy, amines undergo fragmentation to give parent ions with odd molecule weights. This observed mass spectrum follows the nitrogen rule; a molecule with an odd number of nitrogen atoms produces a molecular ion with an odd molecular weight. Amines undergo fragmentation through α cleavage, producing nitrogen-containing cations—iminium ions—and alkyl radicals. Mass spectra of aromatic and cyclic aliphatic amines exhibit strong molecular ion peaks, but acyclic...
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The molecular ion peak of a molecule in the mass spectrum provides vital information for molecular identification. However, conventional electron impact ionization can lead to the rapid dissociation of some molecular ions before they reach the detector. A milder ionization method is required to increase the lifetime of such ionized analyte molecules. Chemical ionization (CI) is a gas-phase protonation reaction useful for mass-analyzing analyte molecules that are easily protonated to yield the...
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Updated: Feb 4, 2026

TurboID-Based Proximity Labeling for In Planta Identification of Protein-Protein Interaction Networks
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Exploring Protein Interactomes Using TurboID-Directed Proximity Labeling and Mass Spectrometry.

Elvio Rodríguez Araya1,2, Gonzalo Martínez Peralta3,4, Lucila Attala3,4

  • 1Instituto de Biología Molecular y Celular de Rosario, CONICET-UNR, Rosario, Argentina. rodriguezaraya@ibr-conicet.gov.ar.

Methods in Molecular Biology (Clifton, N.J.)
|February 2, 2026
PubMed
Summary

This study introduces a new method for mapping protein interactions in Trypanosoma cruzi using proximity labeling (PL) with TurboID. The optimized protocol generates reliable proximity proteomes, aiding in understanding cellular functions.

Keywords:
BiotinylationInteractomicsMass spectrometryProtein–protein interactionsProteomicsProximity labelingTrypanosoma cruziTurboID

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Parasitology

Background:

  • Traditional protein interaction mapping methods struggle with transient interactions.
  • Proximity labeling (PL) offers a solution for capturing dynamic protein associations in vivo.
  • Trypanosoma cruzi interactions are crucial for understanding parasitic diseases.

Purpose of the Study:

  • To develop and standardize a proximity labeling protocol for Trypanosoma cruzi.
  • To create a novel vector system (pTcTurboID) for stable and regulatable protein expression.
  • To generate high-confidence proximity proteomes in T. cruzi.

Main Methods:

  • Utilized a novel vector system, pTcTurboID, for TurboID fusion protein expression.
  • Implemented an eight-step protocol including lineage generation, biotinylation optimization, and streptavidin bead purification.
  • Employed compartment-specific spatial controls and statistical analysis to identify true interactors.

Main Results:

  • Successfully generated reproducible proximity interactomes using nuclear and cytoplasmic baits.
  • Validated the pTcTurboID system for stable and regulatable bait expression.
  • Demonstrated minimal bait expression to preserve physiological function while ensuring biotinylation activity.

Conclusions:

  • The developed protocol offers an efficient, reproducible, and robust framework for proximity proteomics in T. cruzi.
  • This method advances the study of protein interactions in this important parasite.
  • Enables high-confidence mapping of both stable and transient protein interactions.