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Updated: Mar 25, 2026

Characterization of MLKL-mediated Plasma Membrane Rupture in Necroptosis
Published on: August 7, 2018
Evolutionary divergence of the necroptosis effector MLKL
M C Tanzer1,2, I Matti1,2, J M Hildebrand1,2
1Cell Signalling and Cell Death Division, The Walter and Eliza Hall Institute of Medical Research, Parkville, Victoria 3052, Australia.
The mixed-lineage kinase domain-like (MLKL) protein
Area of Science:
- Cellular biology
- Molecular biology
- Biochemistry
Background:
- Mixed-lineage kinase domain-like (MLKL) is essential for necroptosis.
- RIPK3-mediated phosphorylation activates MLKL, initiating cell death.
- MLKL activation involves N-terminal 4-helix bundle (4HB) domain exposure and oligomerization.
Purpose of the Study:
- To investigate the evolutionary conservation of MLKL function in necroptosis.
- To determine if the MLKL 4HB domain's cell death-inducing capacity is conserved across species.
Main Methods:
- Analysis of MLKL orthologues from various species.
- Expression of MLKL 4HB domains in murine fibroblasts.
- Forced dimerization experiments of the human MLKL 4HB domain.
- Liposome permeabilization assays using recombinant MLKL proteins.
Main Results:
- Human, chicken, and stickleback MLKL 4HB domains did not induce cell death independently.
- Forced dimerization of the human MLKL 4HB domain rescued cell death induction.
- The MLKL 4HB domain's membrane-permeabilization function is evolutionarily conserved.
- Species-specific factors influence the execution of necroptosis via MLKL.
Conclusions:
- The membrane-permeabilization ability of the MLKL 4HB domain is conserved.
- Necroptosis execution by MLKL depends on poorly conserved, species-specific factors.
- Evolutionary divergence impacts the precise mechanisms of necroptosis.
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