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Related Concept Videos

Proteomics01:33

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A proteome is the entire set of proteins that a cell type produces. We can study proteomes using the knowledge of genomes because genes code for mRNAs, and the mRNAs encode proteins. Although mRNA analysis is a step in the right direction, not all mRNAs are translated into proteins.
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Related Experiment Video

Updated: Feb 9, 2026

Laser Microdissection-Based Protocol for the LC-MS/MS Analysis of the Proteomic Profile of Neuromelanin Granules
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Unveiling Brain Aβ Heterogeneity Through Targeted Proteomic Analysis.

Agueda Rostagno1, Thomas A Neubert2,3, Jorge Ghiso4,5

  • 1Department of Pathology, New York University School of Medicine, New York, NY, USA.

Methods in Molecular Biology (Clifton, N.J.)
|June 11, 2018
PubMed
Summary

Alzheimer's disease (AD) brain deposits contain diverse amyloid-beta (Aβ) forms. A new protocol differentiates soluble and deposited Aβ, revealing numerous truncated Aβ species crucial for understanding AD pathogenesis.

Keywords:
Amyloid-βC-terminal truncationsImmunoprecipitationMass spectrometryN-terminal truncationsPosttranslational modificationsProteolytic cleavage

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Area of Science:

  • Neuroscience
  • Biochemistry
  • Molecular Biology

Background:

  • Alzheimer's disease (AD) is characterized by amyloid-beta (Aβ) deposits in the brain.
  • Aβ heterogeneity in deposits suggests enzymatic cleavage, but diverse species remain poorly characterized.

Purpose of the Study:

  • To develop and validate a sequential extraction protocol for differential fractionation of soluble and deposited Aβ species.
  • To biochemically identify and characterize the molecular diversity of Aβ species in AD brain deposits.

Main Methods:

  • Sequential extraction using buffers of increasing stringency (PBS, detergents, formic acid) to isolate Aβ species based on solubility.
  • Biochemical identification via Western blot and targeted proteomics (immunoprecipitation coupled with MALDI-ToF mass spectrometry).

Main Results:

  • The protocol successfully fractionated soluble and deposited Aβ species.
  • Numerous C- and N-terminal truncated Aβ species were identified, beyond Aβ1-40/42.
  • Soluble fractions contained predominantly C-terminal cleaved fragments, while N-terminal truncated species required harsher extraction conditions.

Conclusions:

  • The developed protocol effectively characterizes Aβ heterogeneity in AD.
  • Understanding the diversity and solubility of truncated Aβ species is vital for elucidating AD pathogenesis.
  • Truncated Aβ species represent potential novel therapeutic targets for Alzheimer's disease.