Curr Opin Struct Biol. 2002 Dec;12(6):735-41.

Protein tyrosine kinases: autoregulation and small-molecule inhibition.

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Skirball Institute of Biomolecular Medicine and Department of Pharmacology, New York University School of Medicine, New York 10016, USA. hubbard@saturn.med.nyu.edu

Abstract

Receptor and non-receptor protein tyrosine kinases (PTKs) are essential enzymes in cellular signaling processes that regulate cell growth, differentiation, migration and metabolism. The kinase activity of PTKs is tightly controlled through steric, autoregulatory mechanisms, as well as by the action of protein tyrosine phosphatases. Recent structural studies have revealed several modes of autoregulation governing the catalytic state of these enzymes. Aberrant catalytic activity of many PTKs, via mutation or overexpression, plays an important role in numerous pathological conditions, including cancer. Structural studies of the Abl tyrosine kinase domain in complex with the small-molecule inhibitor STI571 provide a molecular basis for understanding the specificity determinants of this highly successful drug used in the treatment of chronic myeloid leukemia.

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