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J. Biol. Chem., Vol. 276, Issue 21, 18090-18095, May 25, 2001
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,
, and
From the Ruttenberg Cancer Center, Mount Sinai School of Medicine,
New York, New York 10029 and the Modification of the ATP pocket on protein kinases
allows selective use of an ATP analogue that exhibits high affinity for the altered kinases. Using this approach, we altered the ATP-binding site on JNK and identified
N6-(2-phenythyl)-ATP, a modified form of ATP
that exhibits high specificity and affinity for the modified, but not
the wild type form, of JNK. Using modified JNK and its ATP analogue
enables the detection of novel JNK substrates. Among substrates
identified using this approach is heterogeneous nuclear
ribonucleoprotein K, which is involved in transcription and
post-transcriptional mRNA metabolism. The newly identified
substrate can be phosphorylated by JNK on amino acids 216 and 353, which contribute to heterogeneous nuclear ribonucleoprotein K mediated
transcriptional activities.
Department of
Cellular and Molecular Pharmacology, and § Pharmaceutical
Chemistry, University of California,
San Francisco, California 94143
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