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Garnish, Sarah E; Meng, Yanxiang; Koide, Akiko; Sandow, Jarrod J; Denbaum, Eric; Jacobsen, Annette V; Yeung, Wayland; Samson, Andre L; Horne, Christopher R; Fitzgibbon, Cheree; Young, Samuel N; Smith, Phoebe P C; Webb, Andrew I; Petrie, Emma J; Hildebrand, Joanne M; Kannan, Natarajan; Czabotar, Peter E; Koide, Shohei; Murphy, James M
Nature communications, 04/2021, Letnik: 12, Številka: 1Journal Article
Phosphorylation of the MLKL pseudokinase by the RIPK3 kinase leads to MLKL oligomerization, translocation to, and permeabilization of, the plasma membrane to induce necroptotic cell death. The precise choreography of MLKL activation remains incompletely understood. Here, we report Monobodies, synthetic binding proteins, that bind the pseudokinase domain of MLKL within human cells and their crystal structures in complex with the human MLKL pseudokinase domain. While Monobody-32 constitutively binds the MLKL hinge region, Monobody-27 binds MLKL via an epitope that overlaps the RIPK3 binding site and is only exposed after phosphorylated MLKL disengages from RIPK3 following necroptotic stimulation. The crystal structures identified two distinct conformations of the MLKL pseudokinase domain, supporting the idea that a conformational transition accompanies MLKL disengagement from RIPK3. These studies provide further evidence that MLKL undergoes a large conformational change upon activation, and identify MLKL disengagement from RIPK3 as a key regulatory step in the necroptosis pathway.
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