A novel adaptor-like protein which is a substrate for the non-receptor tyrosine kinase, BRK

Oncogene. 2000 Aug 31;19(37):4273-82. doi: 10.1038/sj.onc.1203775.


The brk gene encodes a non-receptor tyrosine kinase that has been found to be overexpressed in approximately two thirds of breast tumours. Using a yeast two-hybrid based screen, we have cloned cDNAs encoding a novel protein, BKS, that is a substrate for the kinase activity of BRK and has the characteristics of an adaptor protein. BKS possesses an N-terminal PH-like domain followed by an SH2-like domain. In co-transfection experiments, high levels of phosphotyrosine were observed on BKS and BRK was found to be associated with BKS, both of which were dependent on the catalytic activity of BRK. The phosphorylation of and association with BKS by BRK was also dependent on the SH2-like domain present within BKS. In addition, BKS recruited an unidentified 100 kDa protein that was also phosphorylated on tyrosine residues in the presence of BRK. We have determined that the BKS protein is expressed in most adult human tissues. Oncogene (2000) 19, 4273 - 4282

Publication types

  • Comparative Study
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adaptor Proteins, Signal Transducing*
  • Adult
  • Amino Acid Sequence
  • Base Sequence
  • Breast / metabolism
  • DNA, Complementary / genetics
  • Female
  • Humans
  • Molecular Sequence Data
  • Neoplasm Proteins
  • Phosphoproteins / chemistry
  • Phosphoproteins / isolation & purification*
  • Phosphoproteins / metabolism
  • Phosphorylation
  • Protein Processing, Post-Translational*
  • Protein Structure, Tertiary
  • Protein-Tyrosine Kinases / metabolism*
  • Recombinant Fusion Proteins / metabolism
  • Sequence Alignment
  • Sequence Homology, Amino Acid
  • Two-Hybrid System Techniques
  • src Homology Domains


  • Adaptor Proteins, Signal Transducing
  • DNA, Complementary
  • Neoplasm Proteins
  • Phosphoproteins
  • Recombinant Fusion Proteins
  • STAP2 protein, human
  • Protein-Tyrosine Kinases
  • PTK6 protein, human

Associated data

  • GENBANK/AJ245719