Structure of a Numb PTB domain-peptide complex suggests a basis for diverse binding specificity.Li, S.C., Zwahlen, C., Vincent, S.J., McGlade, C.J., Kay, L.E., Pawson, T., Forman-Kay, J.D.
(1998) Nat.Struct.Mol.Biol. 5: 1075-1083
- PubMed: 9846878
- DOI: 10.1038/4185
- PubMed Abstract:
- High-Affinity Binding of the Drosophila Numb Phosphotyrosine-Binding Domain to Pep Tides Containing a Gly-Pro-(P)Tyr Motif
Li, S.-C.,Songyang, Z.,Vincent, S.J.F.,Zwahlen, C.,Wiley, S.,Cantley, L.,Kay, L.E.,Forman-Kay, J.D.,Pawson, T.
(1997) Proc.Natl.Acad.Sci.USA 94: 7204
The phosphotyrosine-binding (PTB) domain of Numb, a protein involved in asymmetric cell division, has recently been shown to bind to the adapter protein Lnx through an LDNPAY sequence, to the Numb-associated kinase (Nak) through a sequence that does ...
The phosphotyrosine-binding (PTB) domain of Numb, a protein involved in asymmetric cell division, has recently been shown to bind to the adapter protein Lnx through an LDNPAY sequence, to the Numb-associated kinase (Nak) through a sequence that does not contain an NPXY motif and to GP(p)Y-containing peptides obtained from library screening. We show here that these diverse peptide sequences bind with comparable affinities to the Numb PTB domain at a common binding site on the surface of the protein. The NMR structure of the Numb PTB domain in complex with a GPpY-containing peptide reveals a novel mechanism of binding with the peptide in a helical turn that does not hydrogen bond to the PTB domain beta-sheet. These results suggest that PTB domains can potentially have multiple modes of peptide recognition and provide a structural basis from which the multiple functions of the Numb PTB domain during asymmetric cell division could arise.
Samuel Lunenfeld Research Institute, Mount Sinai Hospital, Department of Molecular and Medical Genetics, University of Toronto, Ontario, Canada.