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Protein Networks02:26

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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.
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Groups of proteins may form a complex where each protein in this complex has a different role in the overall execution of the complex’s function. Often some of the proteins in the complex can be replaced by a closely related variant to give a complex that contains many of the same components yet is functionally distinct.
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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...
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IIIDB: a database for isoform-isoform interactions and isoform network modules.

Yu-Ting Tseng, Wenyuan Li, Ching-Hsien Chen

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    |February 25, 2015
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    Summary

    This study introduces a new database (IIIDB) for high-resolution protein-protein interactions (PPIs) at the isoform level. It enables a deeper understanding of cellular pathways and protein functions by predicting isoform-isoform interactions (IIIs).

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    Area of Science:

    • Molecular Biology
    • Bioinformatics
    • Genomics

    Background:

    • Protein-protein interactions (PPIs) are crucial for cellular processes and disease, but current databases lack isoform-level resolution.
    • Alternative splicing significantly impacts PPIs by altering protein domains and interaction partners.
    • Existing PPI data often refers to genes rather than specific protein isoforms, limiting functional insights.

    Purpose of the Study:

    • To address the lack of high-resolution PPI data, this study aimed to predict genome-wide isoform-isoform interactions (IIIs).
    • The goal was to construct a comprehensive database (IIIDB) for studying PPIs at the isoform level.
    • To facilitate pathway analysis and understanding of protein functions, functional modules within the III network were identified.

    Main Methods:

    • Genome-wide isoform-isoform interactions (IIIs) were systematically predicted using RNA-seq datasets, domain-domain interactions, and known PPIs.
    • An Isoform-Isoform Interaction Database (IIIDB) was constructed to store and provide access to these predicted IIIs.
    • Isoform modules were identified through III network clustering, followed by Gene Ontology (GO) and pathway enrichment analysis to evaluate their functionality.

    Main Results:

    • The study successfully predicted genome-wide isoform-isoform interactions (IIIs).
    • A novel Isoform-Isoform Interaction Database (IIIDB) was established as a resource for isoform-resolution PPI research.
    • Network clustering identified 1025 isoform modules, with subsequent enrichment analysis confirming their functional relevance.

    Conclusions:

    • The IIIDB offers human protein-protein interaction predictions at the high resolution of transcript isoforms.
    • This resource aids in a detailed understanding of protein functions and complex biological pathways.
    • The IIIDB and its web interface are freely available for researchers to explore IIIs and III network modules.