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Related Concept Videos

MALDI-TOF Mass Spectrometry01:19

MALDI-TOF Mass Spectrometry

Mass spectrometry is a powerful characterization technique that can identify and separate a wide variety of compounds ranging from chemical to biological entities, based on their mass-to-charge ratio (m/z). The instruments that allow this detection, known as mass spectrometers, have three components: an ion source, a mass analyzer, and a detector. These spectrometers differ based on the nature of their ion source and analyzers.Matrix-assisted laser desorption ionization (MALDI) is a commonly...
Rapid Identification of Pathogens01:25

Rapid Identification of Pathogens

MALDI-TOF MS has transformed clinical microbiology by offering a rapid and reliable method for pathogen identification. The traditional approach to microbial identification typically involves time-consuming culture techniques and biochemical tests, which can delay the initiation of appropriate antimicrobial therapy. MALDI-TOF MS avoids these delays by using characteristic ribosomal protein mass patterns of microbial cells, enabling accurate species-level identification within minutes.Principle...
Peptide Identification Using Tandem Mass Spectrometry01:33

Peptide Identification Using Tandem Mass Spectrometry

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.
This technique helps gather information regarding the protein from which the peptide was obtained and to study the peptides’ amino acid sequence. Identifying peptides from a complex mixture is an important component of the growing field of...
Ribosome Profiling02:24

Ribosome Profiling

Ribosome profiling or ribo-sequencing is a deep sequencing technique that produces a snapshot of active translation in a cell. It selectively sequences the mRNAs protected by ribosomes to get an insight into a cell’s translation landscape at any given point in time.
Applications of ribosome profiling
Ribosome profiling has many applications, including in vivo monitoring of translation inside a particular organ or tissue type and quantifying new protein synthesis levels.
The technique helps...

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Related Experiment Video

Updated: Jul 13, 2026

Characterizing RNA Modifications in Single Neurons Using Mass Spectrometry
08:45

Characterizing RNA Modifications in Single Neurons Using Mass Spectrometry

Published on: April 21, 2022

Identifying modifications in RNA by MALDI mass spectrometry.

Stephen Douthwaite1, Finn Kirpekar

  • 1Department of Biochemistry and Molecular Biology, University of Southern Denmark, Odense M, Denmark.

Methods in Enzymology
|August 4, 2007
PubMed
Summary

Matrix-assisted laser desorption/ionization mass spectrometry (MALDI-MS) accurately measures RNA modifications. This technique is vital for studying ribosomal RNA modifications involved in protein synthesis and antibiotic resistance.

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Identification of RNA Fragments Resulting from Enzymatic Degradation using MALDI-TOF Mass Spectrometry
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2D-HELS MS Seq: A General LC-MS-Based Method for Direct and de novo Sequencing of RNA Mixtures with Different Nucleotide Modifications
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2D-HELS MS Seq: A General LC-MS-Based Method for Direct and de novo Sequencing of RNA Mixtures with Different Nucleotide Modifications

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Last Updated: Jul 13, 2026

Characterizing RNA Modifications in Single Neurons Using Mass Spectrometry
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2D-HELS MS Seq: A General LC-MS-Based Method for Direct and de novo Sequencing of RNA Mixtures with Different Nucleotide Modifications
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2D-HELS MS Seq: A General LC-MS-Based Method for Direct and de novo Sequencing of RNA Mixtures with Different Nucleotide Modifications

Published on: July 10, 2020

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Analytical Chemistry

Background:

  • Posttranscriptional modifications (PTMs) alter ribonucleoside bases or sugars, increasing their mass.
  • These modifications are crucial for RNA function and are found in various RNA types, including ribosomal RNA (rRNA).
  • Accurate detection and localization of RNA PTMs are essential for understanding their biological roles.

Purpose of the Study:

  • To highlight the utility of Matrix-Assisted Laser Desorption/Ionization Mass Spectrometry (MALDI-MS) for analyzing RNA modifications.
  • To demonstrate MALDI-MS's applicability to diverse RNA samples, including those from cellular extracts and in vitro systems.
  • To showcase MALDI-MS as a powerful tool for identifying enzymes responsible for RNA modifications.

Main Methods:

  • Utilizing MALDI-MS for direct mass determination of RNA oligonucleotides.
  • Employing nucleotide-specific enzymes for digesting longer RNAs like rRNA.
  • Implementing targeted isolation of specific RNA sequences for detailed analysis when necessary.
  • Analyzing mass spectra dominated by singly charged ions for straightforward interpretation of complex mixtures.

Main Results:

  • MALDI-MS enables accurate mass measurement of RNA molecules, from trinucleotides up to 20-mers.
  • The technique successfully analyzes modifications in complex mixtures and longer RNAs after enzymatic digestion.
  • MALDI-MS has been instrumental in mapping rRNA modifications linked to protein synthesis and antibiotic resistance.
  • The method has aided in identifying enzymes responsible for specific rRNA modifications.

Conclusions:

  • MALDI-MS is a versatile and accurate method for studying RNA posttranscriptional modifications.
  • It offers advantages over techniques like primer extension or chromatography, especially for complex or limited samples.
  • This mass spectrometry approach is crucial for advancing our understanding of RNA biology, including its role in fundamental cellular processes and disease.
  • MALDI-MS facilitates the identification of enzymes involved in RNA modification pathways.