Protein-Protein Interaction Web site at the Jena Center for Bioinformatics

STRING is a database of known and predicted protein-protein interactions. The interactions include direct (physical) and indirect (functional) associations.

Interaction Prediction through Tertiary Structure web-based tool to predict protein-protein interactions.

IntAct provides a freely available, open source database system and analysis tools for protein interaction data. All interactions are derived from literature curation or direct user submissions and are freely available.

The MIPS Mammalian Protein-Protein Interaction Database is a collection of manually curated high-quality PPI data collected from the scientific literature by expert curators. We took great care to include only data from individually performed experiments since they usually provide the most reliable evidence for physical interactions.

Biomolecular INteraction Network Database

PPI section of the Comprehensive Yeast Genome Database.

Database of Interacting Proteins. The DIPTM database catalogs experimentally determined interactions between proteins. It combines information from a variety of sources to create a single, consistent set of protein-protein interactions. The data stored within the DIP database were curated, both, manually by expert curators and also automatically using computational approaches that utilize the the knowledge about the protein-protein interaction networks extracted from the most reliable, core subset of the DIP data

The Biological General Repository for Interaction Datasets (BioGRID) database (http://www.thebiogrid.org) was developed to house and distribute collections of protein and genetic interactions from major model organism species. BioGRID currently contains over 198 000 interactions from six different species, as derived from both high-throughput studies and conventional focused studies.

Interactions between HIV and host proteins at the NCBI

The Human Protein Reference Database represents a centralized platform to visually depict and integrate information pertaining to domain architecture, post-translational modifications, interaction networks and disease association for each protein in the human proteome.

Human Protein Interaction Database at Inha University.

Information Hyperlinked over Proteins

Molecular INTeraction database. MINT focuses on experimentally verified protein-protein interactions mined from the scientific literature by expert curators. The curated data can be analyzed in the context of the high throughput data and viewed graphically with the 'MINT Viewer'.

Homomint is a web available tool extending protein-protein interactions experimentally verified in models organisms, to the orthologous proteins in Homo sapiens.

Many protein interactions are mediated by small protein modules binding to short linear peptides. DOMINO (http://mint.bio.uniroma2.it/domino/) is an open-access database comprising more than 3900 annotated experiments describing interactions mediated by protein-interaction domains. DOMINO: a database of domain-peptide interactions.

Software platform for the visualization of complex interation networks.

I2D ( Interologous Interaction Database) is designed to be both a resource for the laboratory scientist to explore known and predicted protein-protein interactions, and to facilitate bioinformatics initiatives exploring protein interaction networks.

PDZBase is a manually curated protein-protein interaction database developed specifically for interactions involving PDZ domains.

An integrative platform for network/pathway analysis; visANT = Integrative Visual Analysis Tool for Biological Networks and Pathways.