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Protein Networks

Protein Networks

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,...

Protein Networks

Protein Networks

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,...

Protein-protein Interfaces

Protein-protein Interfaces

Many proteins form complexes to carry out their functions, making protein-protein interactions (PPIs) essential for an organism's survival. Most PPIs are stabilized by numerous weak noncovalent chemical forces. The physical shape of the interfaces determines the way two proteins interact. Many globular proteins have closely-matching shapes on their surfaces, which form a large number of weak bonds. Additionally, many PPIs occur between two helices or between a surface cleft and a polypeptide...

Protein-Protein Interfaces

Protein-Protein Interfaces

Many proteins form complexes to carry out their functions, making protein-protein interactions (PPIs) essential for an organism's survival. Most PPIs are stabilized by numerous weak noncovalent chemical forces. The physical shape of the interfaces determines the way two proteins interact. Many globular proteins have closely-matching shapes on their surfaces, which form a large number of weak bonds. Additionally, many PPIs occur between two helices or between a surface cleft and a polypeptide...

Proteomics

Proteomics

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.
Proteomics is the study of proteomes' function. It involves the large-scale systematic study of the proteome to denote the protein complement expressed by a genome. Scientist Mark Wilkins coined the term proteomics...

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Related Experiment Video

Updated: Jun 25, 2026

Imaging Protein-protein Interactions in vivo

Imaging Protein-protein Interactions in vivo

Published on: October 10, 2010

Functional proteomics: protein-protein interactions in vivo.

Maria Monti¹, Marianna Cozzolino, Flora Cozzolino

¹CEINGE Biotecnologie Avanzate s.c.a r.l., Napoli, Italy.

The Italian Journal of Biochemistry

|February 6, 2009

Summary

Functional proteomics identifies protein interactions to understand cellular mechanisms and unknown protein functions. Affinity-based methods and immunoprecipitation isolate protein complexes for analysis via mass spectrometry.

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In-vivo Detection of Protein-protein Interactions on Micro-patterned Surfaces

In-vivo Detection of Protein-protein Interactions on Micro-patterned Surfaces

Published on: March 19, 2010

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Last Updated: Jun 25, 2026

Imaging Protein-protein Interactions in vivo

Imaging Protein-protein Interactions in vivo

Published on: October 10, 2010

In-vivo Detection of Protein-protein Interactions on Micro-patterned Surfaces

In-vivo Detection of Protein-protein Interactions on Micro-patterned Surfaces

Published on: March 19, 2010

Area of Science:

Proteomics
Molecular Biology
Biochemistry

Background:

Functional proteomics aims to determine the biological roles of unknown proteins.
Understanding cellular mechanisms requires identifying protein-protein interactions.
Protein complexes are key to elucidating cellular functions and signaling pathways.

Purpose of the Study:

To outline methods for isolating functional protein complexes.
To detail techniques for identifying protein interactors.
To highlight the importance of protein complex analysis in functional proteomics.

Main Methods:

Affinity-based isolation using immobilized ligands (bait) on agarose supports.
Immunoprecipitation of in vivo formed protein complexes using epitope-tagged proteins and antibodies.
Elution, SDS-PAGE separation, in situ digestion, and capillary LC-MS/MS analysis of protein components.

Main Results:

Successful isolation and identification of protein interactors within complexes.
Demonstration of two primary strategies for protein complex purification.
Enabling the elucidation of protein functions and cellular mechanisms.

Conclusions:

Protein complex isolation is crucial for functional proteomics.
Affinity-based and immunoprecipitation methods are effective for identifying protein interactors.
These techniques advance the understanding of molecular mechanisms and protein functions.