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. 2002 Dec 15;368(Pt 3):939–945. doi: 10.1042/BJ20021127

Differential targeting of the stress mitogen-activated protein kinases to the c-Jun dimerization protein 2.

Sigal Katz 1, Ami Aronheim 1
PMCID: PMC1223036  PMID: 12225289

Abstract

The mitogen-activated kinases are structurally related proline-directed serine/threonine kinases that phosphorylate similar phosphoacceptor sites and yet, in vivo, they exhibit stringent substrate specificity. Specific targeting domains (kinase docking domains) facilitate kinase-substrate interaction and play a major role in substrate specificity determination. The c-Jun N-terminal kinase (JNK) consensus docking domain comprises of a KXXK/RXXXXLXL motif located in the delta-domain of the c-Jun N-terminal to the phosphoacceptor site. The c-Jun dimerization protein 2 is phosphorylated by JNK on Thr-148. Activating transcription factor 3 (ATF3) is a basic leucine zipper protein which is highly homologous to c-Jun dimerization protein 2 (JDP2), especially within the threonine/proline phosphoacceptor site, Thr-148. Nevertheless, ATF3 does not serve as a JNK substrate in vitro or in vivo. Using ATF3 and JDP2 protein chimaeras, we mapped the JNK-docking domain within JDP2. Although a JNK consensus putative docking site is located within the JDP2 leucine zipper motif, this domain does not function to recruit JNK to JDP2. A novel putative docking domain located C-terminally to the JDP2 phosphoacceptor site was identified. This domain, when fused to the ATF3 heterologous phosphoacceptor site, can direct its phosphorylation by JNK. In addition, although the novel JNK-docking domain was found to be necessary for p38 phosphorylation of JDP2 on Thr-148, it was not sufficient to confer JDP2 phosphorylation by the p38 kinase.

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Selected References

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