The BCL-2 family reunion

Jerry E Chipuk1, Tudor Moldoveanu, Fabien Llambi

  • 1Department of Immunology, St. Jude Children's Research Hospital, 262 Danny Thomas Place, Memphis, TN 38105, USA.

Molecular Cell
|February 18, 2010
PubMed

Insights

The BCL-2 protein family, initially known for regulating apoptosis, now shows broader roles in cellular pathways. This review explores their complex mechanisms and regulation in cell fate decisions.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Biochemistry

Background:

  • The BCL-2 (B cell CLL/lymphoma-2) protein family was first identified for its critical role in regulating apoptosis.
  • These proteins are key controllers of outer mitochondrial membrane integrity.
  • Recent findings reveal expanded functions beyond apoptosis.

Purpose of the Study:

  • To discuss the mechanisms and functions of the BCL-2 protein family.
  • To explore the integration and regulation of BCL-2 family proteins in various cellular pathways.
  • To highlight the role of BCL-2 proteins in cell fate determination.

Main Methods:

  • Literature review and synthesis of current research findings.
  • Analysis of molecular mechanisms governing BCL-2 protein interactions.
  • Discussion of regulatory networks involving the BCL-2 family.

Main Results:

  • BCL-2 family proteins are involved in numerous cellular processes beyond apoptosis.
  • Complex regulatory networks integrate BCL-2 family members into diverse cellular functions.
  • These proteins play a significant role in the intricate decision-making processes of cell fate.

Conclusions:

  • The BCL-2 family's functions are more extensive than previously understood.
  • Understanding BCL-2 family regulation is crucial for deciphering cell fate.
  • Further research into these pathways will illuminate novel therapeutic targets.

Related Concept Videos

Attachment of Sister Chromatids02:57

Attachment of Sister Chromatids

As cells progress into mitosis, the nuclear envelope breaks down, and the condensed chromosomes are exposed to the array of bipolar microtubules of the mitotic spindle. The kinetochore, a large, disc-shaped protein complex, is present at the centromere region of the sister chromatids and acts as a binding site for the microtubules.  Usually, the plus-end of a single microtubule is embedded within the kinetochore. However, some kinetochores first establish lateral contact with the side-wall of a...
Attachment of Sister Chromatids02:57

Attachment of Sister Chromatids

As cells progress into mitosis, the nuclear envelope breaks down, and the condensed chromosomes are exposed to the array of bipolar microtubules of the mitotic spindle. The kinetochore, a large, disc-shaped protein complex, is present at the centromere region of the sister chromatids and acts as a binding site for the microtubules.  Usually, the plus-end of a single microtubule is embedded within the kinetochore. However, some kinetochores first establish lateral contact with the side-wall of a...
Separation of Sister Chromatids02:17

Separation of Sister Chromatids

At the transition from prophase to metaphase, there is a reduction in cohesion along the chromosomal arms, resulting in the resolution of sister chromatids. However, residual cohesin connections remain to hold the sister chromatids together until the transition from metaphase to anaphase. The residual connection prevents any premature separation of sister chromatids, blocking the risks of aneuploidy within the daughter cells.
At the onset of anaphase, separase, a proteolytic enzyme, is...
Separation of Sister Chromatids02:17

Separation of Sister Chromatids

At the transition from prophase to metaphase, there is a reduction in cohesion along the chromosomal arms, resulting in the resolution of sister chromatids. However, residual cohesin connections remain to hold the sister chromatids together until the transition from metaphase to anaphase. The residual connection prevents any premature separation of sister chromatids, blocking the risks of aneuploidy within the daughter cells.
At the onset of anaphase, separase, a proteolytic enzyme, is...
The Intrinsic Apoptotic Pathway01:31

The Intrinsic Apoptotic Pathway

Internal cellular stress, such as cellular injury or hypoxia, triggers intrinsic apoptosis. The B-cell lymphoma 2 (Bcl-2) family of proteins are the primary regulators of the intrinsic apoptotic pathway. For example, during DNA damage, checkpoint proteins, such as Ataxia Telangiectasia Mutated (ATM protein) and Checkpoints Factor-2 (Chk2) proteins, are activated. These proteins phosphorylate p53 which further activates pro-apoptotic proteins, such as Bax, Bak, PUMA, and Noxa, and inhibits...
Homologous Recombination02:31

Homologous Recombination

The basic reaction of homologous recombination (HR) involves two chromatids that contain DNA sequences sharing a significant stretch of identity. One of these sequences uses a strand from another as a template to synthesize DNA in an enzyme-catalyzed reaction. The final product is a novel amalgamation of the two substrates. To ensure an accurate recombination of sequences, HR is restricted to the S and G2 phases of the cell cycle. At these stages, the DNA has been replicated already and the...