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Amino acids03:42

Amino acids

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Amino acids are the monomers that comprise proteins. Each amino acid has the same fundamental structure, which consists of a central carbon atom, or the alpha (α) carbon, bonded to an amino group (NH2), a carboxyl group (COOH), and to a hydrogen atom. Every amino acid also has another atom or group of atoms bonded to the central atom known as the R group. There are 20 common amino acids present in proteins, each with a different R group. Variation in the amino acid sequence is responsible for...
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Related Experiment Video

Updated: Jan 28, 2026

Kinetic Screening of Nuclease Activity using Nucleic Acid Probes
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Tricarboxylic acid metabolon.

Fei Wu1, Shelley D Minteer2

  • 1Institute of Chemistry, Chinese Academy of Sciences, Beijing, China.

Methods in Enzymology
|February 21, 2019
PubMed
Summary

Determining the structure of the large TCA metabolon, which resists crystallization, was achieved using cross-linking mass spectrometry. This study details the methods and findings, offering insights into metabolic pathways.

Keywords:
Cross-linking mass spectrometryInteractomicsMetabolonSubstrate channeling

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Metabolomics

Background:

  • The tricarboxylic acid (TCA) cycle is a central metabolic pathway.
  • Understanding the structure of metabolic enzyme complexes (metabolons) is crucial for elucidating pathway regulation.
  • The TCA metabolon's large size and insolubility prevent traditional structural determination methods like X-ray crystallography and NMR.

Purpose of the Study:

  • To outline experimental protocols for determining the structure of the TCA metabolon.
  • To present the application of cross-linking mass spectrometry (XL-MS) for TCA metabolon structural analysis.
  • To discuss the implications of TCA metabolon structure for the broader field of metabolism.

Main Methods:

  • Focus on cross-linking mass spectrometry (XL-MS) as a primary technique.
  • Detailed explanation of experimental procedures for XL-MS applied to the TCA metabolon.
  • Analysis of interactomics data to infer structural organization.

Main Results:

  • Presentation of determined TCA metabolon structures based on XL-MS data.
  • Identification of specific protein-protein interactions within the TCA metabolon.
  • Structural insights into the spatial arrangement of TCA cycle enzymes.

Conclusions:

  • XL-MS is a viable method for structural determination of large, non-crystallizable metabolons.
  • The elucidated TCA metabolon structure provides a framework for understanding metabolic channeling and regulation.
  • Lessons learned from this study advance the field of structural metabolomics.