title: What properties characterize the hub proteins of the protein-protein interaction network of Saccharomyces cerevisiae?
abstract: BACKGROUND
  Most proteins interact with only a few other proteins while a small number of proteins (hubs) have many interaction partners. Hub proteins and non-hub proteins differ in several respects; however, understanding is not complete about what properties characterize the hubs and set them apart from proteins of low connectivity. Therefore, we have investigated what differentiates hubs from non-hubs and static hubs (party hubs) from dynamic hubs (date hubs) in the protein-protein interaction network of Saccharomyces cerevisiae.
  
  
  RESULTS
  The many interactions of hub proteins can only partly be explained by bindings to similar proteins or domains. It is evident that domain repeats, which are associated with binding, are enriched in hubs. Moreover, there is an over representation of multi-domain proteins and long proteins among the hubs. In addition, there are clear differences between party hubs and date hubs. Fewer of the party hubs contain long disordered regions compared to date hubs, indicating that these regions are important for flexible binding but less so for static interactions. Furthermore, party hubs interact to a large extent with each other, supporting the idea of party hubs as the cores of highly clustered functional modules. In addition, hub proteins, and in particular party hubs, are more often ancient. Finally, the more recent paralogs of party hubs are underrepresented.
  
  
  CONCLUSIONS
  Our results indicate that multiple and repeated domains are enriched in hub proteins and, further, that long disordered regions, which are common in date hubs, are particularly important for flexible binding.
authors.affiliation: Stockholm Bioinformatics Center, Stockholm University, Stockholm, Sweden.
authors.forename: Diana
authors.initials: D
authors.lastname: Ekman
authors.forename: Sara
authors.initials: S
authors.lastname: Light
authors.forename: Asa K
authors.initials: AK
authors.lastname: Björklund
authors.forename: Arne
authors.initials: A
authors.lastname: Elofsson
mesh_terms: D001665:Binding Sites; D003198:Computer Simulation; D030562:Databases, Protein; D008954:Models, Biological; D011487:Protein Conformation; D025941:Protein Interaction Mapping; D017434:Protein Structure, Tertiary; D012441:Saccharomyces cerevisiae / Q000378:metabolism*; D029701:Saccharomyces cerevisiae Proteins / Q000737:chemistry* / Q000378:metabolism*
chemical_list: D029701:Saccharomyces cerevisiae Proteins