Related Experiment Video

Updated: May 5, 2026

Examining BCL-2 Family Function with Large Unilamellar Vesicles
08:35

Examining BCL-2 Family Function with Large Unilamellar Vesicles

Published on: October 5, 2012

7.4K

MCL-1ES induces MCL-1L-dependent BAX- and BAK-independent mitochondrial apoptosis

Jae-Hong Kim1, Jeehyeon Bae

  • 1College of Pharmacy, Chung-Ang University, Seoul, Korea.

Plos One
|November 22, 2013
PubMed

Insights

MCL-1ES, a distinct proapoptotic molecule, induces cell death independently of BAX/BAK. Its apoptotic activity relies on MCL-1L for mitochondrial localization and oligomerization, offering therapeutic potential for diseases involving MCL-1L.

Area of Science:

  • Molecular Biology
  • Cell Death Pathways
  • Cancer Research

Background:

  • MCL-1 (myeloid cell leukemia-1) is a BCL-2 family protein with antiapoptotic (MCL-1L) and proapoptotic (MCL-1S, MCL-1ES) splicing variants.
  • MCL-1ES was previously identified as a proapoptotic molecule.

Purpose of the Study:

  • To elucidate the molecular mechanism by which MCL-1ES promotes apoptosis.
  • To investigate the role of MCL-1L in MCL-1ES-induced cell death.

Main Methods:

  • Investigated MCL-1ES apoptotic mechanism.
  • Assessed interaction with BCL-2 family proteins.
  • Determined requirement of BAX, BAK, and MCL-1L for apoptosis.
  • Analyzed BH3 domain function.
  • Observed mitochondrial oligomerization, MOMP, and cytochrome c release.

Main Results:

  • MCL-1ES induces apoptosis independently of BAX and BAK.
  • MCL-1L is essential for MCL-1ES mitochondrial localization and apoptotic function.
  • MCL-1ES interacts only with MCL-1L among BCL-2 family proteins.
  • The BH3 domain of MCL-1ES is critical for MCL-1L interaction and apoptosis.
  • MCL-1ES forms mitochondrial oligomers, leading to MOMP and cytochrome c release in a MCL-1L-dependent manner.

Conclusions:

  • MCL-1ES represents a novel proapoptotic BCL-2 family member with a unique mechanism of action.
  • MCL-1ES-induced apoptosis is dependent on MCL-1L for mitochondrial targeting and oligomerization.
  • MCL-1ES may serve as a therapeutic target for diseases characterized by uncontrolled MCL-1L.

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