Comparative Analysis of Docking Motifs in MAP-Kinases and Nuclear Receptors

Abstract Nuclear receptor (NR) agonists induce activation of mitogen-activated protein kinases (MAPK) through an yet unknown rapid non-genomic mechanism. Vice versa, NR are targets for phosphorylation by MAPK. By multiple alignment of the amino acid sequences and comparative analysis of the secondary and tertiary structures we identified four peptides in MAPK with similarity to bona fide protein-protein-interaction motifs in NR. In both molecule species, these motifs mediate selective docking to dimerization partners, coregulators or phosphoacceptors. We therefore propose that similar motifs may direct the site-specific association of NR with MAPK. Based on mutual allosteric interactions within a kinase-receptor complex, we discuss a novel principle how NR-agonists may regulate kinase activity and thus expression of hormone-dependent genes.

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