Abstract
Aurora kinase B (AKB), a Ser/Thr kinase that plays a crucial role in mitosis, is overexpressed in several cancers. Clinical inhibitors targeting AKB bind to the active DFG “in” conformation of the kinase. It would be beneficial, however, to understand if AKB is susceptible to type II kinase inhibitors that bind to the inactive, DFG “out” conformation, since type II inhibitors achieve higher kinome selectivity and higher potency in vivo. The DFG “out” conformation of AKB is not yet experimentally determined which makes the design of type II inhibitors exceedingly difficult. An alternate approach is to simulate the DFG “out” conformation from the experimentally determined DFG “in” conformation using atomistic molecular dynamics (MD) simulation. In this work, we employed metadynamics (MTD) approach to simulate the DFG “out” conformation of AKB by choosing the appropriate collective variables. We examined structural changes during the DFG-flip and determined the interactions crucial to stabilize the kinase in active and inactive states. Interestingly, the MTD approach also identified a unique transition state (DFG “up”), which can be targeted by small molecule inhibitors. Structural insights about these conformations is essential for structure-guided design of next-generation AKB inhibitors. This work also emphasizes the usefulness of MTD simulations in predicting macromolecular conformational changes at reduced computational costs.
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Funding
This work was supported by an Institutional Development Award (IDeA) from the National Institute of General Medical Sciences of the National Institutes of Health under grant number “P20 GM109005.” BF was supported by the UAMS Seeds of Science Grant, the UAMS COP Seed Grant, and a grant from the American Thyroid Association (ATA/Thyca). HL was supported by NIH grants (NIH 1R01CA194094 and 1R01CA197178). MB was supported by Inglewood Scholars Program and NIA/NIH grant 2P01AG012411-17A1 (W.S.T. Griffin, P.I.)
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Lakkaniga, N.R., Balasubramaniam, M., Zhang, S. et al. Structural Characterization of the Aurora Kinase B “DFG-flip” Using Metadynamics. AAPS J 22, 14 (2020). https://doi.org/10.1208/s12248-019-0399-6
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DOI: https://doi.org/10.1208/s12248-019-0399-6