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@ARTICLE{Czajka:286088,
author = {Czajka, Titus and Major, Andras and Bruns, Hendrik and
Cammarata, Marco and Hoffmann, Christian and Milovanovic,
Dragomir and Salditt, Tim},
title = {{V}esicle dynamics in synapsin-induced condensates by
passive {X}-ray microrheology.},
journal = {Biophysical journal},
volume = {125},
number = {7},
issn = {0006-3495},
address = {Cambridge, Mass.},
publisher = {Cell Press},
reportid = {DZNE-2026-00384},
pages = {1713 - 1722},
year = {2026},
abstract = {The collective dynamics of subcellular biological processes
is often difficult to assess experimentally due to the
challenges associated with spatial and temporal resolution,
labeling, or multiple scattering. X-ray photon correlation
spectroscopy is, in principle, well suited to probe
collective dynamics by quantifying dispersion relations in
complex fluids in general and biomolecular systems in
particular. However, the low scattering signal and the
sensitivity to radiation damage set stringent limits to many
applications. Probing the dynamics of vesicles in
protein-induced condensates is a case in point. Here, we use
lipid vesicles with a hard silica core, called
colloid-supported lipid bilayers, as labeled vesicles for
enhanced X-ray contrast. We then probe structure and
dynamics in solutions of vesicles and synapsin, a protein
known for its property of inducing liquid-liquid phase
separation and forming condensates that recruit vesicles,
organizing them into clusters in presynaptic nerve
terminals. The dynamics in these systems is found to exhibit
evidence for both liquid-like and network-like phases. Our
results reveal distinct effective-diffusion constants at
varying protein concentrations. At the same time the
stretched exponential decay of the correlation functions
provides clear evidence for nondiffusive behavior within the
condensates.},
keywords = {Lipid Bilayers: chemistry / Lipid Bilayers: metabolism /
Synapsins: metabolism / Synapsins: chemistry / Diffusion /
X-Rays / Biomolecular Condensates: chemistry / Biomolecular
Condensates: metabolism / Lipid Bilayers (NLM Chemicals) /
Synapsins (NLM Chemicals)},
cin = {AG Milovanovic (Berlin)},
ddc = {570},
cid = {I:(DE-2719)1813002},
pnm = {351 - Brain Function (POF4-351)},
pid = {G:(DE-HGF)POF4-351},
typ = {PUB:(DE-HGF)16},
pubmed = {pmid:41795188},
doi = {10.1016/j.bpj.2026.03.006},
url = {https://pub.dzne.de/record/286088},
}