Forskning ved Københavns Universitet - Københavns Universitet


WW domains provide a platform for the assembly of multiprotein networks

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningfagfællebedømt

  • Robert J Ingham
  • Karen Colwill
  • Caley Howard
  • Sabine Dettwiler
  • Caesar S H Lim
  • Joanna Yu
  • Kadija Hersi
  • Judith Raaijmakers
  • Gerald Gish
  • Geraldine Mbamalu
  • Lorne Taylor
  • Benny Yeung
  • Galina Vassilovski
  • Manish Amin
  • Fu Chen
  • Liudmila Matskova
  • Gösta Winberg
  • Ingemar Ernberg
  • Rune Linding
  • Paul O'donnell
  • Og 5 flere
  • Andrei Starostine
  • Walter Keller
  • Pavel Metalnikov
  • Chris Stark
  • Tony Pawson

WW domains are protein modules that mediate protein-protein interactions through recognition of proline-rich peptide motifs and phosphorylated serine/threonine-proline sites. To pursue the functional properties of WW domains, we employed mass spectrometry to identify 148 proteins that associate with 10 human WW domains. Many of these proteins represent novel WW domain-binding partners and are components of multiprotein complexes involved in molecular processes, such as transcription, RNA processing, and cytoskeletal regulation. We validated one complex in detail, showing that WW domains of the AIP4 E3 protein-ubiquitin ligase bind directly to a PPXY motif in the p68 subunit of pre-mRNA cleavage and polyadenylation factor Im in a manner that promotes p68 ubiquitylation. The tested WW domains fall into three broad groups on the basis of hierarchical clustering with respect to their associated proteins; each such cluster of bound proteins displayed a distinct set of WW domain-binding motifs. We also found that separate WW domains from the same protein or closely related proteins can have different specificities for protein ligands and also demonstrated that a single polypeptide can bind multiple classes of WW domains through separate proline-rich motifs. These data suggest that WW domains provide a versatile platform to link individual proteins into physiologically important networks.

TidsskriftMolecular and Cellular Biology
Udgave nummer16
Sider (fra-til)7092-7106
Antal sider15
StatusUdgivet - aug. 2005
Eksternt udgivetJa

ID: 122677925