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Structure of anticancer ruthenium half-sandwich complex bound to glycogen synthase kinase 3β

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Abstract

The 3.15-Å-resolution crystal structure of the R enantiomer of the highly bioactive and antiproliferative half-sandwich ruthenium complex DW12 bound to the ATP binding site of glycogen synthase kinase 3β (GSK-3β) is reported and the binding is compared with the GSK-3β binding of staurosporine and other organic inhibitors. The structure reveals a close packing of the organometallic inhibitor in the ATP binding site of GSK-3β via an induced-fit mechanism. The molecular structure of (R)-DW12 with the CO ligand oriented perpendicular to the pyridocarbazole heterocycle allows the complex to stretch the whole distance sandwiched between the faces of the N- and C-terminal lobes and to interact tightly with the flexible glycine-rich loop, which is uncommon for the interaction of GSK-3β with organic inhibitors.

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Acknowledgments

We would like to acknowledge the support and assistance of David W. Christianson (University of Pennsylvania) and his group for crystallography. We also thank Heather Gennadios for helpful discussions.

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Correspondence to Eric Meggers.

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An Interactive 3D Complement page in Proteopedia is available at: http://proteopedia.org/wiki/index.php/Journal:JBIC:2.

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Atilla-Gokcumen, G.E., Di Costanzo, L. & Meggers, E. Structure of anticancer ruthenium half-sandwich complex bound to glycogen synthase kinase 3β. J Biol Inorg Chem 16, 45–50 (2011). https://doi.org/10.1007/s00775-010-0699-x

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  • DOI: https://doi.org/10.1007/s00775-010-0699-x

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