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@ARTICLE{Bleicken:125273,
author = {S. Bleicken$^*$ and A. Hantusch and K. K. Das and T.
Frickey and A. J. Garcia-Saez$^*$},
title = {{Q}uantitative interactome of a membrane {B}cl-2 network
identifies a hierarchy of complexes for apoptosis
regulation.},
journal = {Nature Communications},
volume = {8},
number = {1},
issn = {2041-1723},
address = {London},
publisher = {Nature Publishing Group},
reportid = {DKFZ-2017-01412},
pages = {73},
year = {2017},
abstract = {The Bcl-2 proteins form a complex interaction network that
controls mitochondrial permeabilization and apoptosis. The
relative importance of different Bcl-2 complexes and their
spatio-temporal regulation is debated. Using fluorescence
cross-correlation spectroscopy to quantify the interactions
within a minimal Bcl-2 network, comprised by cBid, Bax, and
Bcl-xL, we show that membrane insertion drastically alters
the pattern of Bcl-2 complexes, and that the C-terminal
helix of Bcl-xL determines its binding preferences. At
physiological temperature, Bax can spontaneously activate in
a self-amplifying process. Strikingly, Bax also recruits
Bcl-xL to membranes, which is sufficient to retrotranslocate
Bax back into solution to secure membrane integrity. Our
study disentangles the hierarchy of Bcl-2 complex formation
in relation to their environment: Bcl-xL association with
cBid occurs in solution and in membranes, where the complex
is stabilized, whereas Bcl-xL binding to Bax occurs only in
membranes and with lower affinity than to cBid, leading
instead to Bax retrotranslocation.The permeabilization of
the mitochondrial outer membrane to induce apoptosis is
regulated by complex interactions between Bcl-2 family
members. Here the authors develop a quantitative interactome
of a membrane Bcl-2 network and identify a hierarchy of
protein complexes in apoptosis induction.},
cin = {B160},
ddc = {500},
cid = {I:(DE-He78)B160-20160331},
pnm = {312 - Functional and structural genomics (POF3-312)},
pid = {G:(DE-HGF)POF3-312},
typ = {PUB:(DE-HGF)16},
pubmed = {pmid:28706229},
pmc = {pmc:PMC5509671},
doi = {10.1038/s41467-017-00086-6},
url = {https://inrepo02.dkfz.de/record/125273},
}