Architectures and Functional Coverage of Protein-Protein Interfaces

Nurcan Tuncbag, Attila Gursoy, Emre Guney, Ruth Nussinov, Ozlem Keskin

Research output: Contribution to journalArticlepeer-review


The diverse range of cellular functions is performed by a limited number of protein folds existing in nature. One may similarly expect that cellular functional diversity would be covered by a limited number of protein-protein interface architectures. Here, we present 8205 interface clusters, each representing a unique interface architecture. This data set of protein-protein interfaces is analyzed and compared with older data sets. We observe that the number of both biological and crystal interfaces increases significantly compared to the number of Protein Data Bank entries. Furthermore, we find that the number of distinct interface architectures grows at a much faster rate than the number of folds and is yet to level off. We further analyze the growth trend of the functional coverage by constructing functional interaction networks from interfaces. The functional coverage is also found to steadily increase. Interestingly, we also observe that despite the diversity of interface architectures, some are more favorable and frequently used, and of particular interest, are the ones that are also preferred in single chains.

Original languageEnglish
Pages (from-to)785-802
Number of pages18
JournalJournal of Molecular Biology
Issue number3
StatePublished - 5 Sep 2008


  • binding
  • interface database
  • protein interaction
  • protein interfaces
  • structure and function


Dive into the research topics of 'Architectures and Functional Coverage of Protein-Protein Interfaces'. Together they form a unique fingerprint.

Cite this