© 1999 by Oxford University Press
Journal of the National Cancer Institute, Vol. 91, No. 2, 102-103,
January 20, 1999
© 1999 Oxford University Press
EDITORIALS |
A Bcr/Abl Kinase Antagonist for Chronic Myelogenous Leukemia: a Promising Path for Progress Emerges
Affiliation of author: Developmental Therapeutics Program,Division of Cancer Treatment and Diagnosis, National Cancer Institute, Bethesda, MD.
Correspondence to: Edward A. Sausville, M.D., Ph.D., National Institutes of Health, EPN Bldg., Rm. 843, Bethesda, MD 20892-7458.
Protein kinases catalyze the transfer of the
-phosphate of
adenosine triphosphate (ATP) to protein acceptors. Over the past 40
years, we have learned that protein phosphorylation is a central
regulatory strategy to alter cellular function. Proteins can be
phosphorylated on serine, threonine, tyrosine, and rarely histidine
residues. However, tyrosine kinases have come to be understood as
critical regulators of cell proliferation, invasion, metastasis, and
cell survival. Tyrosine kinases exist as two major classes. In receptor
tyrosine kinases, including platelet-derived growth factor receptor,
epidermal growth factor receptor, and its homologue the c-erbB2
oncogene product, the kinase activity is actually part of the receptor,
which has one extracellular domain to bind molecules promoting
proliferation at the cell surface, a second domain that traverses the
cell membrane, and an intracellular catalytic domain that acts to cause
tyrosine
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