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Updated: Dec 6, 2025

Examining BCL-2 Family Function with Large Unilamellar Vesicles
Published on: October 5, 2012
The Multifaceted Roles of the BCL-2 Family Member BOK
Samara Naim1, Thomas Kaufmann1
1Institute of Pharmacology, University of Bern, Bern, Switzerland.
Abstract:
BCL-2-related ovarian killer (BOK) is-despite its identification over 20 years ago-an incompletely understood member of the BCL-2 family. BCL-2 family proteins are best known for their critical role in the regulation of mitochondrial outer membrane permeabilization during the intrinsic apoptotic pathway. Based on sequence and structural similarities to BAX and BAK, BOK is grouped with these "killers" within the effector subgroup of the family. However, the mechanism of how exactly BOK exerts apoptosis is not clear and controversially discussed. Furthermore, and in accordance with reports on several other BCL-2 family members, BOK seems to be involved in the regulation of a variety of other, "apoptosis-independent" cellular functions, including the unfolded protein response, cellular proliferation, metabolism, and autophagy. Of note, compared with other proapoptotic BCL-2 family members, BOK levels are often reduced in cancer by various means, and there is increasing evidence for BOK modulating tumorigenesis. In this review, we summarize and discuss apoptotic- and non-apoptotic-related functions of BOK, its regulation as well as its physiological and pathophysiological roles.
Insights
BCL-2-related ovarian killer (BOK) protein
Area of Science:
- Molecular Biology
- Cell Biology
- Biochemistry
Background:
- The BCL-2 protein family regulates apoptosis via mitochondrial outer membrane permeabilization.
- BCL-2-related ovarian killer (BOK) is an effector member, grouped with BAX and BAK.
- BOK's precise apoptotic mechanism and non-apoptotic roles remain incompletely understood.
Purpose of the Study:
- To review the known apoptotic and non-apoptotic functions of BOK.
- To discuss the regulation and physiological/pathophysiological roles of BOK.
- To highlight BOK's involvement in cancer and tumorigenesis.
Main Methods:
- Literature review of studies on BOK.
- Analysis of sequence and structural similarities to other BCL-2 family members.
- Synthesis of current research on BOK's functions and regulation.
Main Results:
- BOK's role in apoptosis is debated, despite structural similarities to BAX/BAK.
- BOK influences apoptosis-independent processes like unfolded protein response, proliferation, metabolism, and autophagy.
- Reduced BOK levels in cancer suggest a role in tumorigenesis.
Conclusions:
- BOK exhibits diverse functions beyond apoptosis, impacting cellular processes.
- BOK's dysregulation in cancer warrants further investigation into its role in tumorigenesis.
- Further research is needed to elucidate BOK's complex mechanisms and therapeutic potential.
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