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Related Experiment Video

Updated: Jun 13, 2026

Characterization of MLKL-mediated Plasma Membrane Rupture in Necroptosis

Characterization of MLKL-mediated Plasma Membrane Rupture in Necroptosis

Published on: August 7, 2018

Apoptotic regulation by MCL-1 through heterodimerization.

Qian Liu¹, Tudor Moldoveanu, Tara Sprules

¹Department of Biochemistry, McGill University, Montreal, Quebec H3G 1Y6, Canada.

The Journal of Biological Chemistry

|April 16, 2010

Summary

Myeloid cell leukemia 1 (MCL-1) instability is linked to its unstructured N-terminus. Removing this sequence yields a stable core (cMCL-1) crucial for binding BH3 ligands, aiding cancer drug discovery.

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Area of Science:

Biochemistry
Molecular Biology
Structural Biology

Background:

Myeloid cell leukemia 1 (MCL-1) is an anti-apoptotic protein vital for development and hematopoiesis.
MCL-1 dysregulation is implicated in various human cancers.
Its intrinsically unstructured N-terminal sequence causes cellular instability and production challenges.

Purpose of the Study:

To investigate the binding selectivity of MCL-1 with BCL-2 homology 3 (BH3) ligands.
To characterize the role of the N-terminal sequence in MCL-1's interactions.
To determine the structural and functional properties of a stabilized MCL-1 core domain (cMCL-1).

Main Methods:

Nuclear Magnetic Resonance (NMR) spectroscopy
Isothermal titration calorimetry
Calpain-mediated limited proteolysis
Size exclusion chromatography

Main Results:

The N-terminal sequence of MCL-1 weakens BH3 ligand interactions but preserves selectivity.
Removal of the N-terminus generates a stable core domain (cMCL-1) essential for BH3 ligand binding.
The interaction between cMCL-1 and activated BID is slow but structurally similar to BID-BH3 peptide interactions.
The solution structure of the cMCL-1:BID-BH3 complex was determined.

Conclusions:

A stable core domain (cMCL-1) can be generated by removing the unstructured N-terminus.
cMCL-1 retains essential BH3 ligand binding capabilities.
Structural insights into MCL-1 complexes may facilitate the development of novel cancer therapeutics targeting MCL-1.