Download MendeleyStructure 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 Biol 5: 1075-1083
- PubMed: 9846878 Search on PubMed
- DOI: https://doi.org/10.1038/4185
- Primary Citation Related Structures:
2NMB - PubMed Abstract:
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.
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