Translocation of mixed lineage kinase domain-like protein to plasma membrane leads to necrotic cell death

Cell Research
Xin ChenJiahuai Han

Abstract

Mixed lineage kinase domain-like protein (MLKL) was identified to function downstream of receptor interacting protein 3 (RIP3) in tumor necrosis factor-α (TNF)-induced necrosis (also called necroptosis). However, how MLKL functions to mediate necroptosis is unknown. By reconstitution of MLKL function in MLKL-knockout cells, we showed that the N-terminus of MLKL is required for its function in necroptosis. The oligomerization of MLKL in TNF-treated cells is essential for necroptosis, as artificially forcing MLKL together by using the hormone-binding domain (HBD*) triggers necroptosis. Notably, forcing together the N-terminal domain (ND) but not the C-terminal kinase domain of MLKL causes necroptosis. Further deletion analysis showed that the four-α-helix bundle of MLKL (1-130 amino acids) is sufficient to trigger necroptosis. Both the HBD*-mediated and TNF-induced complexes of MLKL(ND) or MLKL are tetramers, and translocation of these complexes to lipid rafts of the plasma membrane precedes cell death. The homo-oligomerization is required for MLKL translocation and the signal sequence for plasma membrane location is located in the junction of the first and second α-helices of MLKL. The plasma membrane translocation of MLKL or ML...Continue Reading

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Methods Mentioned

BETA
immunoprecipitation
pull-down
electrophoresis
density gradient centrifugation
fluorescence microscopy
PCR
flow cytometry
light scattering

Software Mentioned

iQ
ImageJ

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