Activation segment dimerization: a mechanism for kinase autophosphorylation of non-consensus sites

作者: Ashley C W Pike , Peter Rellos , Frank H Niesen , Andrew Turnbull , Antony W Oliver

DOI: 10.1038/EMBOJ.2008.8

关键词: ProtomerProtein kinase AActive siteAutophosphorylationBiophysicsBiochemistryProtein structureBiologyPhosphorylationKinaseSignal transduction

摘要: Protein kinase autophosphorylation of activation segment residues is a common regulatory mechanism in phosphorylation-dependent signalling cascades. However, the molecular mechanisms that guarantee specific and efficient phosphorylation these sites have not been elucidated. Here, we report on three novel diverse protein structures reveal an exchanged conformation. This dimeric arrangement results active conformation trans, with close proximity to site interacting protomer. Analytical ultracentrifugation chemical cross-linking confirmed presence dimers solution. Consensus substrate sequences for each showed identified are non-consensus sites. Based presented structural functional data, model at proposed likely be other kinases from subfamilies.

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