Nucleic Acids Research, 2002, Vol. 30, No. 1 303-305
© 2002 Oxford University Press
DIP, the Database of Interacting Proteins: a research tool for studying cellular networks of protein interactions
UCLA-DOE Laboratory of Structural Biology and Molecular Medicine, Molecular Biology Institute, PO Box 951570, UCLA, Los Angeles, CA 90095-1570, USA
Received September 18, 2001; Accepted September 20, 2001.
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ABSTRACT |
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 TOP ABSTRACT INTRODUCTIONSTRUCTURE OF THE DATABASESTATE OF THE DATABASETHE JDIP VISUALIZATION TOOLFUTURE DIRECTIONSDATA SUBMISSION AND CURATIONREFERENCES |
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The Database of Interacting Proteins (DIP: http://dip.doe-mbi.ucla.edu) is a database that documents experimentally determined protein–protein interactions. It provides the scientific community with an integrated set of tools for browsing and extracting information about protein interaction networks. As of September 2001, the DIP catalogs
11 000 unique interactions among 5900 proteins from >80 organisms; the vast majority from yeast, Helicobacter pylori and human. Tools have been developed that allow users to analyze, visualize and integrate their own experimental data with the information about protein–protein interactions available in the DIP database. |
INTRODUCTION |
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TOPABSTRACTINTRODUCTIONSTRUCTURE OF THE DATABASESTATE OF THE DATABASETHE JDIP VISUALIZATION TOOLFUTURE DIRECTIONSDATA SUBMISSION AND CURATIONREFERENCES |
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During the last 3 years protein interaction databases have grown to the point of becoming both a commonly used reference source for experimental biologists (1–3), as well as a data source enabling studies of the properties and structure of entire protein interaction networks (4). With the recent development of genome-wide experimental methods such as the two-hybrid test, protein chips and mass spectrometric analysis, the number of reported interactions has increased exponentially. On one hand, this leads to a rapid increase of the coverage of the protein interaction map, providing deeper insight into global properties of the interaction networks. On the other hand, the increasing size and complexity of the available dataset challenges the database developers to provide visualization and analysis tools that utilize the information contained in the network structure (5). As the field matures, it is increasingly clear that we must develop data evaluation methods that can estimate uncertainties and identify the most reliable subset of the putative interactions.
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STRUCTURE OF THE DATABASE |
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TOPABSTRACTINTRODUCTIONSTRUCTURE OF THE DATABASESTATE OF THE DATABASETHE JDIP VISUALIZATION TOOLFUTURE DIRECTIONSDATA SUBMISSION AND CURATIONREFERENCES |
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The structure of the DIP has been designed to capture the essential information about protein–protein interactions available from experimental data. The database is implemented as a relational database composed of four tables (6). Protein Table lists proteins participating in an interaction within DIP. It provides, besides the DIP accession number, cross-references to the three major sequence databases (SWISS-PROT, GenBank, PIR) as well as additional information about the proteins such as keyword, localization and cellular function. Interaction Table catalogs binary interactions between proteins including, when available, information on the interacting domains and the ranges of amino acids necessary for an interaction. Method Table entries capture the experimental technique (such as genome wide two-hybrid screen, immunoprecipitation, affinity binding, antibody blockage) that has been used to determine each interaction and also point to the published sources of experimental data listed in Reference Table. Reference Table lists all the references to different articles that demonstrate protein interactions and link them to the MEDLINE (National Library of Medicine, MD) database.
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STATE OF THE DATABASE |
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TOPABSTRACTINTRODUCTIONSTRUCTURE OF THE DATABASESTATE OF THE DATABASETHE JDIP VISUALIZATION TOOLFUTURE DIRECTIONSDATA SUBMISSION AND CURATIONREFERENCES |
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Over the last year, the number of distinct protein–protein interactions in the DIP has nearly tripled. Currently, the database catalogs >10 500 unique protein–protein interactions between >5900 proteins. Table 1 shows the distribution of the data among the organisms most frequently represented in the database. As earlier, we observe that yeast is the predominant organism in DIP accounting for >7900 distinct interactions (70% of the total interactions), it is followed by Helicobacter pylori and then human, contributing 1420 and 631 interactions, respectively.
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The rapid growth of the database was possible because of two factors. First, the number of articles entered into the database nearly doubled to
1500 providing a diverse source of protein interaction data. However, most importantly, the database currently contains a set of 6125 interactions identified in a number of genome-wide yeast two-hybrid screens (7–11). The reliability of the large scale data is, in general, lower than that provided by experiments focused on a particular interaction (12). However, we can expect that the rough interaction map generated by genome-wide two-hybrid screens provides the scientific community with leads that can be further verified by follow-up experiments as well as through computational approaches. As shown in Table 1, >5500 interactions determined uniquely in the genome-wide screens await such an evaluation. |
THE JDIP VISUALIZATION TOOL |
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TOPABSTRACTINTRODUCTIONSTRUCTURE OF THE DATABASESTATE OF THE DATABASETHE JDIP VISUALIZATION TOOLFUTURE DIRECTIONSDATA SUBMISSION AND CURATIONREFERENCES |
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The increasing size and complexity of the data available in DIP stimulates the development of tools that allow biologists to study and analyze entire networks of protein–protein interactions. Last year we introduced a graphic display of the protein interaction network, centered on any given protein contained in DIP. It provides the means for a fast, visual evaluation of the protein’s interaction environment, represented as a static graph. However, it soon became clear that a more interactive approach is necessary; one that allows for a ‘navigation’ of the protein interaction network. We therefore developed the JDIP tool, both as an applet available within the web interface as well as an independent, cross-platform Java application. Not only does JDIP allow us to curate the data conveniently, but also provides a generic framework for integrating a number of visualization and analysis tools. Currently, besides numerous visualization options, JDIP provides access to a number of genome-wide mRNA expression datasets (13), which can be analyzed after mapping them onto the underlying protein interaction network. The program has been developed to accommodate annotation of network elements with numerical and textual data that can be independent of the DIP. Its XML compliance allows one to annotate the interaction graph with user-specified data and then render the resulting network according to a set of rules specified by the user.
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FUTURE DIRECTIONS |
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TOPABSTRACTINTRODUCTIONSTRUCTURE OF THE DATABASESTATE OF THE DATABASETHE JDIP VISUALIZATION TOOLFUTURE DIRECTIONSDATA SUBMISSION AND CURATIONREFERENCES |
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At present, the DIP curators have two goals: first, to increase the size of the DIP dataset in the human protein subset and, secondly, to provide additional tools for accessing and analyzing the information contained within the database.
A number of strategies have been employed to identify articles containing information suitable for entering into DIP. These include automated searches of the MEDLINE database both against a strict set of keywords as well as searches based on the data-mining strategy (14). Another approach attempts to transfer a known interaction between a pair of proteins to new pairs, detected as homologs of the interacting partners. In order to confirm such putative interactions, MEDLINE records can be searched for papers with concurrent appearance of each member of the pair. This approach promises to extend the many known interactions between yeast proteins to other organisms, most importantly to human, which currently constitutes only 10% of DIP.
Despite the emergence of automated data-mining strategies, identification of the relevant articles and proteins remains the rate-limiting step in data entry. Therefore, we propose to the scientific community that the authors of articles describing protein–protein interactions insert within their articles a line of condensed text in a format described in Figure 1 that identifies the interactions they discover. Such a simple scheme, similar in idea to that of Bader et al. (1) would, at a little overhead to the experimentalist, significantly increase the rate of incorporation of novel data into protein interaction databases.
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If the community were to adapt this proposal, the majority of the newly reported interactions could be automatically deposited into any interaction database. At a later stage, those interactions could be reanalyzed and further curated to extract the remaining details.
Another area for DIP improvement encompasses integration of the database with a number of already existing, well established biological databases such as SWISS-PROT, TRANSPATH, KEGG, YPD to allow users to easily access gather most of the information about a single protein. To this we intend to increase the number of cross-references reported for each DIP entry. We also encourage the maintainers of other databases to provide cross-references to DIP entries in a manner similar to the one already present within SWISS-PROT.
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DATA SUBMISSION AND CURATION |
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TOPABSTRACTINTRODUCTIONSTRUCTURE OF THE DATABASESTATE OF THE DATABASETHE JDIP VISUALIZATION TOOLFUTURE DIRECTIONSDATA SUBMISSION AND CURATIONREFERENCES |
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We seek expert curators to screen entries into the DIP. Scientists are invited to contribute to this database, by submitting interactions directly over the World Wide Web after obtaining a user account. To obtain an account, please contact us at dip{at}mbi.ucla.edu. Help for editing and submission is available online; questions can also be directed to dip{at}mbi.ucla.edu or at the fax number and address listed. Please feel free to send email containing published protein–protein interactions, and a curator will enter this information in the DIP.
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ACKNOWLEDGEMENTS |
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We thank NIH and DOE for support and R. Landgraf for bibliography scanning software.
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FOOTNOTES |
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* To whom correspondence should be addressed. Tel: +1 310 825 3754; Fax: +1 310 206 3914; Email: david{at}mbi.ucla.edu The authors wish it to be known that, in their opinion, the first two authors should be regarded as joint First Authors
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REFERENCES |
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TOPABSTRACTINTRODUCTIONSTRUCTURE OF THE DATABASESTATE OF THE DATABASETHE JDIP VISUALIZATION TOOLFUTURE DIRECTIONSDATA SUBMISSION AND CURATIONREFERENCES |
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