Related Experiment Video
Updated: May 27, 2026
07:44
Identifying Protein-protein Interaction Sites Using Peptide Arrays
Published on: November 18, 2014
Analysis of protein-protein interaction using proteinchip array-based SELDI-TOF mass spectrometry
Gitanjali Jayachandran1, Jack A Roth, Lin Ji
1Department of Thoracic and Cardiovascular Surgery, The University of Texas, Anderson Cancer Center, Houston, TX, USA.
Methods in Molecular Biology (Clifton, N.J.)
|November 16, 2011
Summary
A novel ProteinChip array and SELDI-TOF mass spectrometry assay rapidly and sensitively analyzes protein-protein interactions. This method identifies interaction partners and maps key structural elements involved in binding.
Area of Science:
- Biochemistry
- Molecular Biology
- Proteomics
Background:
- Protein-protein interactions are essential for cellular regulation and signaling.
- Conventional methods for studying protein interactions are often time-consuming, labor-intensive, and lack sensitivity.
- There is a need for rapid, sensitive, and accurate methods to analyze protein-protein interactions.
Purpose of the Study:
- To develop a simple, rapid, and sensitive assay for analyzing protein-protein interactions.
- To map the crucial elements directly involved in protein-protein interactions.
- To identify potential cellular targets of proteins of interest.
Main Methods:
- Immobilization of a "bait" protein or peptide onto a ProteinChip array (PS10 or PS20).
- Application of cellular protein lysate or synthetic peptide to the array.
- Washing off non-specific proteins and analyzing interacting complexes using SELDI-TOF mass spectrometry.
- Confirmation of identities by predicted masses.
Main Results:
- The assay can unambiguously detect specific protein-protein interactions.
- Potential cellular targets of proteins of interest can be easily identified.
- Structural elements involved in protein-protein interactions can be accurately analyzed and mapped.
Conclusions:
- The ProteinChip array and SELDI-TOF mass spectrometry assay offers a powerful tool for studying protein-protein interactions.
- This method provides a significant advancement over conventional techniques in terms of speed, sensitivity, and accuracy.
- The assay facilitates the identification of interaction partners and the mapping of interaction motifs, aiding in the understanding of cellular processes.
Related Concept Videos
02:26Protein 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,...
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,...
01:19MALDI-TOF Mass Spectrometry
Mass spectrometry is a powerful characterization technique that can identify and separate a wide variety of compounds ranging from chemical to biological entities, based on their mass-to-charge ratio (m/z). The instruments that allow this detection, known as mass spectrometers, have three components: an ion source, a mass analyzer, and a detector. These spectrometers differ based on the nature of their ion source and analyzers.Matrix-assisted laser desorption ionization (MALDI) is a commonly...
01:33Proteomics
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...
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...
01:33Peptide Identification Using Tandem Mass Spectrometry
Tandem mass spectrometry, also known as MS/MS or MS2, is an analytical technique that employs two mass analyzers. Essentially it is a series of mass spectrometers that helps isolate a particular biomolecule and then helps study its chemical properties.
This technique helps gather information regarding the protein from which the peptide was obtained and to study the peptides’ amino acid sequence. Identifying peptides from a complex mixture is an important component of the growing field of...
This technique helps gather information regarding the protein from which the peptide was obtained and to study the peptides’ amino acid sequence. Identifying peptides from a complex mixture is an important component of the growing field of...
02:04Protein-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...