Biology:Bcl-2-associated death promoter

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A representation of the 3D structure of the protein myoglobin showing turquoise α-helices.
Generic protein structure example
Pro-apoptotic Bcl-2 protein, BAD
PDB 1g5j EBI.jpg
complex of bcl-xl with peptide from bad
Identifiers
SymbolBcl-2_BAD
PfamPF10514
InterProIPR018868

The BCL2 associated agonist of cell death[1] (BAD) protein is a pro-apoptotic member of the Bcl-2 gene family which is involved in initiating apoptosis. BAD is a member of the BH3-only family,[2] a subfamily of the Bcl-2 family. It does not contain a C-terminal transmembrane domain for outer mitochondrial membrane and nuclear envelope targeting, unlike most other members of the Bcl-2 family.[3] After activation, it is able to form a heterodimer with anti-apoptotic proteins and prevent them from stopping apoptosis.

Mechanism of action

Bax/Bak are believed to initiate apoptosis by forming a pore in the mitochondrial outer membrane that allows cytochrome c to escape into the cytoplasm and activate the pro-apoptotic caspase cascade. The anti-apoptotic Bcl-2 and Bcl-xL proteins inhibit cytochrome c release through the mitochondrial pore and also inhibit activation of the cytoplasmic caspase cascade by cytochrome c.[4]

Dephosphorylated BAD forms a heterodimer with Bcl-2 and Bcl-xL, inactivating them and thus allowing Bax/Bak-triggered apoptosis. When BAD is phosphorylated by Akt/protein kinase B (triggered by PIP3), it forms the BAD-(14-3-3) protein heterodimer. This leaves Bcl-2 free to inhibit Bax-triggered apoptosis.[5] BAD phosphorylation is thus anti-apoptotic, and BAD dephosphorylation (e.g., by Ca2+-stimulated Calcineurin) is pro-apoptotic. The latter may be involved in neural diseases such as schizophrenia.[6]

Interactions

Overview of signal transduction pathways involved with apoptosis.

Bcl-2-associated death promoter has been shown to interact with:


See also

References

  1. "BAD BCL2 associated agonist of cell death [Homo sapiens (Human)] - Gene - NCBI". https://www.ncbi.nlm.nih.gov/gene/572#gene-expression. 
  2. "The proapoptotic BH3-only protein BAD transduces cell death signals independently of its interaction with Bcl-2". Cell Death Differ. 9 (11): 1240–7. 2002. doi:10.1038/sj.cdd.4401097. PMID 12404123. 
  3. "Interference of BAD (Bcl-xL/Bcl-2-associated death promoter)-induced apoptosis in mammalian cells by 14-3-3 isoforms and P11". Mol. Endocrinol. 11 (12): 1858–67. 1997. doi:10.1210/mend.11.12.0023. PMID 9369453. 
  4. Helmreich, E.J.M. (2001) The Biochemistry of Cell Signalling, pp. 238-43
  5. E.J.M. (2001) The Biochemistry of Cell Signalling, pp. 242
  6. Foster, T.C. et al. (2001) J. Neurosci. 21, 4066-4073, "Calcineurin Links Ca++ Dysregulation with Brain Aging"(
  7. 7.0 7.1 7.2 7.3 7.4 7.5 "Differential targeting of prosurvival Bcl-2 proteins by their BH3-only ligands allows complementary apoptotic function". Mol. Cell 17 (3): 393–403. February 2005. doi:10.1016/j.molcel.2004.12.030. PMID 15694340. 
  8. "Survival function of protein kinase C{iota} as a novel nitrosamine 4-(methylnitrosamino)-1-(3-pyridyl)-1-butanone-activated bad kinase". J. Biol. Chem. 280 (16): 16045–52. April 2005. doi:10.1074/jbc.M413488200. PMID 15705582. 
  9. "BAD partly reverses paclitaxel resistance in human ovarian cancer cells". Oncogene 17 (19): 2419–27. November 1998. doi:10.1038/sj.onc.1202180. PMID 9824152. 
  10. "Development of a high-throughput fluorescence polarization assay for Bcl-x(L)". Anal. Biochem. 307 (1): 70–5. August 2002. doi:10.1016/S0003-2697(02)00028-3. PMID 12137781. 
  11. 11.0 11.1 "The anti-apoptotic molecules Bcl-xL and Bcl-w target protein phosphatase 1alpha to Bad". Eur. J. Immunol. 32 (7): 1847–55. July 2002. doi:10.1002/1521-4141(200207)32:7<1847::AID-IMMU1847>3.0.CO;2-7. PMID 12115603. 
  12. "Human homologue of S. pombe Rad9 interacts with BCL-2/BCL-xL and promotes apoptosis". Nat. Cell Biol. 2 (1): 1–6. January 2000. doi:10.1038/71316. PMID 10620799. 
  13. 13.0 13.1 "Bad, a heterodimeric partner for Bcl-XL and Bcl-2, displaces Bax and promotes cell death". Cell 80 (2): 285–91. January 1995. doi:10.1016/0092-8674(95)90411-5. PMID 7834748. 
  14. "Rationale for Bcl-xL/Bad peptide complex formation from structure, mutagenesis, and biophysical studies". Protein Sci. 9 (12): 2528–34. Dec 2000. doi:10.1110/ps.9.12.2528. PMID 11206074. 
  15. "BAD/BCL-[X(L)] heterodimerization leads to bypass of G0/G1 arrest". Oncogene 20 (33): 4507–18. July 2001. doi:10.1038/sj.onc.1204584. PMID 11494146. 
  16. "Synergistic anti-apoptotic activity between Bcl-2 and SMN implicated in spinal muscular atrophy". Nature 390 (6658): 413–7. November 1997. doi:10.1038/37144. PMID 9389483. Bibcode1997Natur.390..413I. 
  17. "PCNA interacts with hHus1/hRad9 in response to DNA damage and replication inhibition". Oncogene 19 (46): 5291–7. November 2000. doi:10.1038/sj.onc.1203901. PMID 11077446. 
  18. 18.0 18.1 18.2 "Underphosphorylated BAD interacts with diverse antiapoptotic Bcl-2 family proteins to regulate apoptosis". Apoptosis 6 (5): 319–30. October 2001. doi:10.1023/A:1011319901057. PMID 11483855. 
  19. "Survival activity of Bcl-2 homologs Bcl-w and A1 only partially correlates with their ability to bind pro-apoptotic family members". Cell Death Differ. 6 (6): 525–32. June 1999. doi:10.1038/sj.cdd.4400519. PMID 10381646. 
  20. 20.0 20.1 "Interference of BAD (Bcl-xL/Bcl-2-associated death promoter)-induced apoptosis in mammalian cells by 14-3-3 isoforms and P11". Mol. Endocrinol. 11 (12): 1858–67. November 1997. doi:10.1210/mend.11.12.0023. PMID 9369453. 
  21. "The proapoptotic protein Bad binds the amphipathic groove of 14-3-3zeta". Biochim. Biophys. Acta 1547 (2): 313–9. June 2001. doi:10.1016/S0167-4838(01)00202-3. PMID 11410287. 

Further reading

External links