Structural Basis for Auto-Inhibition of the NDR1 Kinase Domain by an Atypically Long Activation Segment.
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The human NDR family kinases control diverse aspects of cell growth, and are regulated through phosphorylation and association with scaffolds such as MOB1. Here, we report the crystal structure of the human NDR1 kinase domain in its non-phosphorylated state, revealing a fully resolved atypically long activation segment that blocks substrate binding and stabilizes a non-productive position of helix αC. Consistent with an auto-inhibitory function, mutations within the activation segment of NDR1 dramatically enhance in vitro kinase activity. Interestingly, NDR1 catalytic activity is further potentiated by MOB1 binding, suggesting that regulation through modulation of the activation segment and by MOB1 binding are mechanistically distinct. Lastly, deleting the auto-inhibitory activation segment of NDR1 causes a marked increase in the association with upstream Hippo pathway components and the Furry scaffold. These findings provide a point of departure for future efforts to explore the cellular functions and the mechanism of NDR1.
Cell Line, Tumor
Hepatocyte Growth Factor
Adaptor Proteins, Signal Transducing
Gene Expression Regulation
Amino Acid Sequence
Sequence Homology, Amino Acid
Protein Interaction Domains and Motifs
Protein Conformation, alpha-Helical
Protein Conformation, beta-Strand
Structural Biology of Cell Signalling
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Structure (London, England : 1993), 2018, 26 (8), pp. 1101 - 1115.e6
Except where otherwise noted, this item's license is described as https://creativecommons.org/licenses/by/4.0
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