Yes-associated protein and p53-binding protein-2 interact through their WW and SH3 domains.
To understand the role of the Yes-associated protein (YAP), binding partners of its WW1 domain were isolated by a yeast two-hybrid screen. One of the interacting proteins was identified as p53-binding protein-2 (p53BP-2). YAP and p53BP-2 interacted in vitro and in vivo using their WW1 and SH3 domains, respectively. The YAP WW1 domain bound to the YPPPPY motif of p53BP-2, whereas the p53BP-2 SH3 domain interacted with the VPMRLR sequence of YAP, which is different from other known SH3 domain-binding motifs. By mutagenesis, we showed that this unusual SH3 domain interaction was due to the presence of three consecutive tryptophans located within the betaC strand of the SH3 domain. A point mutation within this triplet, W976R, restored the binding selectivity to the general consensus sequence for SH3 domains, the PXXP motif. A constitutively active form of c-Yes was observed to decrease the binding affinity between YAP and p53BP-2 using chloramphenicol acetyltransferase/enzyme-linked immunosorbent assay, whereas the overexpression of c-Yes did not modify this interaction. Since overexpression of an activated form of c-Yes resulted in tyrosine phosphorylation of p53BP-2, we propose that the p53BP-2 phosphorylation, possibly in the WW1 domain-binding motif, might negatively regulate the YAP.p53BP-2 complex.
Pubmed ID: 11278422 RIS Download
Adaptor Proteins, Signal Transducing | Amino Acid Motifs | Amino Acid Sequence | Apoptosis Regulatory Proteins | Blotting, Western | Brain | Carrier Proteins | Cell Line | Chloramphenicol O-Acetyltransferase | DNA, Complementary | Enzyme-Linked Immunosorbent Assay | Gene Library | Glutathione Transferase | Humans | Molecular Sequence Data | Mutagenesis, Site-Directed | Phosphoproteins | Phosphorylation | Plasmids | Point Mutation | Precipitin Tests | Protein Binding | Protein Structure, Tertiary | Sequence Homology, Amino Acid | Transfection | Tryptophan | Two-Hybrid System Techniques | Tyrosine | src Homology Domains