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Section of Molecular Diagnosis, Department of Pathology, Childrens Hospital of Los Angeles, Los Angeles, California 90027
Chronic myelogenous leukemia is characterized by a specific chromosomal translocation, t(9;22), in which the ABL protooncogene and the BCR gene become juxtaposed. The chimeric BCR/ABL gene produces a P210 fusion protein with deregulated tyrosine kinase activity. We have recently isolated a complementary DNA, CRKL, which could code for an adaptor protein consisting of one SH2 and two SH3 domains and lacking any catalytic domain. In the current study, we show that CRKL is highly phosphorylated in the chronic myelogenous leukemia cell line K562 and that it is a substrate for the p210 BCR/ABL and p145 ABL kinases. BCR/ABL and ABL are coimmunoprecipitated with CRKL in vivo, demonstrating that relatively stable complexes are formed. In addition, the nucleotide exchange factor mSOS1 was found to be coimmunoprecipitated with CRKL. These findings establish a putative signal transduction pathway through which BCR/ABL mediates its oncogenic activity.
1 This study was supported by USPHS Grant CA47456 (to J. G.).
2 To whom requests for reprints should be addressed, at Department of Pathology, Childrens Hospital of Los Angeles, 4650 Sunset Boulevard, Los Angeles, CA 90027.
Received 3/30/94. Accepted 4/ 6/94.
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