Proto-Oncogene Proteins c-bcr

A serine-threonine kinase that contains a C2 DOMAIN and PLECKSTRIN HOMOLOGY DOMAIN. It also has activity as a GTPASE-ACTIVATING PROTEIN for RAC1 PROTEIN and CDC42 PROTEIN. It functions as a negative regulator of CELL PROLIFERATION and NEOPLASTIC CELL TRANSFORMATION and is commonly fused with cellular abl protein to form BCR-ABL FUSION PROTEINS in PHILADELPHIA CHROMOSOME positive LEUKEMIA patients.