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@ARTICLE{Subburaj:127580,
author = {Y. Subburaj and U. Ros and E. Hermann and R. Tong and A. J.
García-Sáez$^*$},
title = {{T}oxicity of an α-pore-forming toxin depends on the
assembly mechanism on the target membrane as revealed by
single molecule imaging.},
journal = {The journal of biological chemistry},
volume = {290},
number = {8},
issn = {1083-351X},
address = {Bethesda, Md.},
publisher = {Soc.},
reportid = {DKFZ-2017-03603},
pages = {4856 - 4865},
year = {2015},
abstract = {α-Pore-forming toxins (α-PFTs) are ubiquitous defense
tools that kill cells by opening pores in the target cell
membrane. Despite their relevance in host/pathogen
interactions, very little is known about the pore
stoichiometry and assembly pathway leading to membrane
permeabilization. Equinatoxin II (EqtII) is a model α-PFT
from sea anemone that oligomerizes and forms pores in
sphingomyelin-containing membranes. Here, we determined the
spatiotemporal organization of EqtII in living cells by
single molecule imaging. Surprisingly, we found that on the
cell surface EqtII did not organize into a unique oligomeric
form. Instead, it existed as a mixture of oligomeric species
mostly including monomers, dimers, tetramers, and hexamers.
Mathematical modeling based on our data supported a new
model in which toxin clustering happened in seconds and
proceeded via condensation of EqtII dimer units formed upon
monomer association. Furthermore, altering the pathway of
EqtII assembly strongly affected its toxic activity, which
highlights the relevance of the assembly mechanism on
toxicity.},
keywords = {Cnidarian Venoms (NLM Chemicals) / Pore Forming Cytotoxic
Proteins (NLM Chemicals) / equinatoxin (NLM Chemicals)},
cin = {B160},
ddc = {570},
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:25525270},
pmc = {pmc:PMC4335225},
doi = {10.1074/jbc.M114.600676},
url = {https://inrepo02.dkfz.de/record/127580},
}