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Protein Networks

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An organism can have thousands of different proteins, and these proteins must cooperate to ensure the health of an organism. Proteins bind to other proteins and form complexes to carry out their functions. Many proteins interact with multiple other proteins creating a complex network of protein interactions.
These interactions can be represented through maps depicting protein-protein interaction networks, represented as nodes and edges. Nodes are circles that are representative of a protein,...

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Updated: Aug 19, 2025

Label-Free Immunoprecipitation Mass Spectrometry Workflow for Large-scale Nuclear Interactome Profiling

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Affinity-Based Interactome Analysis of Endogenous LINE-1 Macromolecules.

Luciano H Di Stefano¹, Leila J Saba¹, Mehrnoosh Oghbaie²

¹European Research Institute for the Biology of Ageing, University Medical Center Groningen, Groningen, Netherlands.

Methods in Molecular Biology (Clifton, N.J.)

|November 30, 2022

Summary

This study details methods for isolating and analyzing LINE-1 (L1) ribonucleoproteins (RNPs). These techniques help define the protein and RNA components of L1 RNPs in various cell types and tissues.

Keywords:

Affinity capture Interactomics Protein complexes Retrotransposon Ribonucleoprotein

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Published on: April 1, 2017

Area of Science:

Molecular Biology
Genetics
Epigenetics

Background:

LINE-1 (L1) retrotransposons generate heterogeneous ribonucleoproteins (RNPs) during proliferation.
The precise protein and RNA compositions of L1 RNPs are not well-defined.
L1 RNP composition varies based on the L1 life cycle stage, expression status (productive or suppressed), and cell type.

Purpose of the Study:

To describe techniques for capturing and characterizing protein and RNA components of L1 macromolecules.
To provide protocols applicable to tissues with endogenous L1 expression.

Main Methods:

Isolation of L1-associated macromolecules from native tissues.
Characterization of protein and RNA constituents within L1 macromolecules.
Application of protocols to embryonal carcinoma cell lines (N2102Ep, NTERA-2, PA-1) and colorectal cancer tissues.

Main Results:

Established protocols for capturing and characterizing L1 RNPs.
Demonstrated applicability in model cell lines and clinical samples.
Provided a framework for understanding L1 RNP heterogeneity.

Conclusions:

The described techniques facilitate the study of L1 RNP composition.
These methods are adaptable for various tissues with endogenous L1 expression.
Improved understanding of L1 RNP biology can inform research on retrotransposon activity and associated diseases.