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Related Concept Videos

Subcellular Fractionation01:32

Subcellular Fractionation

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The homogenate obtained after cell lysis contains various membrane-bound organelles that can be further separated into pure fractions by subcellular fractionation. These isolates are used to study specific cellular components, analyze localized protein activity, and are even employed in diagnostics. Fractionation is typically achieved using centrifugation methods, the most common being density-gradient and differential centrifugation.
Differential Centrifugation
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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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Different fluorescence-based techniques are used to study the protein dynamics in living cells. These techniques include FRAP, FRET, and PET.
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Updated: Oct 19, 2025

Enriching Subcellular Proteins in Leptospira Using a Triton X-114-Based Fractionation Approach
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Subcellular proteomics.

Josie A Christopher1,2, Charlotte Stadler3, Claire E Martin4

  • 1Department of Biochemistry, University of Cambridge, Cambridge, UK.

Nature Reviews. Methods Primers
|September 22, 2021
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Summary
This summary is machine-generated.

Understanding protein localization within eukaryotic cells is crucial for cell biology and disease research. This study reviews spatial proteomics methods to map protein locations and dynamics, aiding in understanding cellular functions and pathologies.

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JUMPn: A Streamlined Application for Protein Co-Expression Clustering and Network Analysis in Proteomics
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Area of Science:

  • Cell Biology
  • Proteomics
  • Molecular Biology

Background:

  • Eukaryotic cells feature distinct subcellular compartments (organelles) where proteins perform specific functions.
  • Protein localization and dynamic movement are vital for cellular processes like signaling, growth, and cell death.
  • Aberrant protein localization is linked to various diseases, highlighting the need to study protein distribution.

Purpose of the Study:

  • To provide an overview of major spatial proteomics methods for determining protein location, distribution, and abundance within subcellular structures.
  • To discuss the workflows, data outputs, applications, and limitations of current spatial proteomics technologies.
  • To identify emerging technologies and areas for innovation in spatial proteome characterization.

Main Methods:

  • Fluorescent imaging techniques for visualizing protein localization.
  • Protein proximity labeling to map protein interactions and locations.
  • Organelle purification and biochemical fractionation for isolating and analyzing subcellular components.
  • Cell-wide fractionation approaches to capture global protein distribution.

Main Results:

  • Spatial proteomics methods enable the mapping of protein localization and dynamics across different cellular states and perturbations.
  • These techniques provide insights into protein functions, cellular processes, and disease mechanisms related to mislocalization.
  • The review details the practical aspects, applications, and inherent limitations of various spatial proteomics approaches.

Conclusions:

  • Spatial proteomics is essential for a comprehensive understanding of cellular organization and function.
  • Current methods offer powerful tools but have limitations, necessitating further technological development.
  • Advancements in spatial proteomics will enhance our ability to study cell biology and associated diseases.