Biophysical characterization of the oligomeric state of Bax and its complex formation with Bcl-XL.
The overexpression of Bax, a member of the Bcl-2 family, promotes cell death and the dimerization (or oligomerization) of Bax has been shown to be important for its function. Using size-exclusion chromatography and in vitro cross-linking experiments, we demonstrated that Bax exists mainly as a large oligomer of approximately 30 monomeric units. Furthermore, several binding assays demonstrated that Bcl-XL, an anti-apoptotic member of the Bcl-2 family, can bind to the oligomeric form of Bax without requiring Bax to dissociate to monomers.
Institute of Molecular and Cell Biology, Singapore.
Y J
YJ
Tan
W
W
Beerheide
A E
AE
Ting
D017209:Apoptosis; D015374:Biosensing Techniques; D002460:Cell Line; D019281:Dimerization; D006801:Humans; D007700:Kinetics; D046911:Macromolecular Substances; D008928:Mitochondria / Q000737:chemistry / Q000502:physiology; D008954:Models, Biological; D011485:Protein Binding; D011487:Protein Conformation; D011518:Proto-Oncogene Proteins / Q000737:chemistry* / Q000378:metabolism / Q000502:physiology; D019253:Proto-Oncogene Proteins c-bcl-2 / Q000737:chemistry* / Q000378:metabolism / Q000502:physiology; D011993:Recombinant Fusion Proteins / Q000737:chemistry / Q000378:metabolism; D020349:Surface Plasmon Resonance; D051028:bcl-2-Associated X Protein; D051020:bcl-X Protein
C494826:BAX protein, human; C494811:BCL2L1 protein, human; D046911:Macromolecular Substances; D011518:Proto-Oncogene Proteins; D019253:Proto-Oncogene Proteins c-bcl-2; D011993:Recombinant Fusion Proteins; D051028:bcl-2-Associated X Protein; D051020:bcl-X Protein