Related Experiment Video
Updated: May 24, 2026
Identifying Protein-protein Interaction Sites Using Peptide Arrays
Published on: November 18, 2014
Enriching the human apoptosis pathway by predicting the structures of protein-protein complexes
Saliha Ece Acuner Ozbabacan1, Ozlem Keskin, Ruth Nussinov
1Center for Computational Biology and Bioinformatics and College of Engineering, Koc University, Rumelifeneri Yolu, 34450 Sariyer Istanbul, Turkey.
Abstract:
Apoptosis is a matter of life and death for cells and both inhibited and enhanced apoptosis may be involved in the pathogenesis of human diseases. The structures of protein-protein complexes in the apoptosis signaling pathway are important as the structural pathway helps in understanding the mechanism of the regulation and information transfer, and in identifying targets for drug design. Here, we aim to predict the structures toward a more informative pathway than currently available. Based on the 3D structures of complexes in the target pathway and a protein-protein interaction modeling tool which allows accurate and proteome-scale applications, we modeled the structures of 29 interactions, 21 of which were previously unknown. Next, 27 interactions which were not listed in the KEGG apoptosis pathway were predicted and subsequently validated by the experimental data in the literature. Additional interactions are also predicted. The multi-partner hub proteins are analyzed and interactions that can and cannot co-exist are identified. Overall, our results enrich the understanding of the pathway with interactions and provide structural details for the human apoptosis pathway. They also illustrate that computational modeling of protein-protein interactions on a large scale can help validate experimental data and provide accurate, structural atom-level detail of signaling pathways in the human cell.
Insights
This study models protein-protein interactions in the human apoptosis pathway, revealing new interactions and structural details. Computational modeling enhances understanding of cell death signaling and aids drug design for diseases.
Area of Science:
- Cell Biology
- Structural Biology
- Bioinformatics
Background:
- Apoptosis, a critical cellular process, is implicated in various human diseases when dysregulated.
- Understanding protein-protein interactions within the apoptosis signaling pathway is crucial for elucidating disease mechanisms and identifying drug targets.
Purpose of the Study:
- To predict and model the 3D structures of protein-protein complexes in the human apoptosis signaling pathway.
- To expand the known interactome of the apoptosis pathway and provide atomic-level structural insights.
Main Methods:
- Utilized a protein-protein interaction modeling tool for accurate, proteome-scale applications.
- Modeled 3D structures of 29 protein-protein interactions, including 21 novel ones.
- Predicted and validated 27 additional interactions not present in the KEGG apoptosis pathway using literature data.
Main Results:
- Successfully modeled 29 protein-protein interactions, with 21 being previously unknown.
- Identified and validated 27 new interactions for the apoptosis pathway.
- Analyzed multi-partner hub proteins and determined co-existing interaction constraints.
Conclusions:
- The study significantly enriches the understanding of the human apoptosis pathway with novel interactions and structural information.
- Computational modeling provides accurate, atom-level details of signaling pathways, supporting experimental data validation.
- The findings offer valuable structural insights for drug design targeting apoptosis-related diseases.
More Related Videos
Related Concept Videos
02:04Protein-protein Interfaces
02:26Protein Networks
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,...
01:31The Intrinsic Apoptotic Pathway
01:30Assembly of Signaling Complexes
Interaction domains in cell signaling
Interaction domains recognize exposed features of their binding partners containing post-translationally modified sequences,...
01:17The Extrinsic Apoptotic Pathway
01:13The Proteasome
In this pathway, the target proteins are first tagged with small proteins called ubiquitin. This involves participation of a series of enzymes including— E1 (ubiquitin-activating enzyme), E2 (ubiquitin-conjugating enzyme), and E3 (ubiquitin...