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@ARTICLE{nnep:183572,
author = {Ünnep, R. and Zsiros, O. and Solymosi, K. and Kovács, L.
and Lambrev, P. H. and Tóth, T. and Schweins, R. and
Posselt, D. and Szekely, Noemi and Rosta, L. and Nagy, G.
and Garab, G.},
title = {{T}he ultrastructure and flexibility of thylakoid membranes
in leaves and isolated chloroplasts as revealed by
small-angle neutron scattering},
journal = {Biochimica et biophysica acta / Bioenergetics},
volume = {1837},
number = {9},
issn = {0005-2728},
address = {Amsterdam},
publisher = {Elsevier},
reportid = {FZJ-2014-06866},
pages = {1572 - 1580},
year = {2014},
abstract = {We studied the periodicity of the multilamellar membrane
system of granal chloroplasts in different isolated plant
thylakoid membranes, using different suspension media, as
well as on different detached leaves and isolated
protoplasts—using small-angle neutron scattering. Freshly
isolated thylakoid membranes suspended in isotonic or
hypertonic media, containing sorbitol supplemented with
cations, displayed Bragg peaks typically between 0.019 and
0.023 Å− 1, corresponding to spatially and statistically
averaged repeat distance values of about 275–330 Å.
Similar data obtained earlier led us in previous work to
propose an origin from the periodicity of stroma thylakoid
membranes. However, detached leaves, of eleven different
species, infiltrated with or soaked in D2O in dim laboratory
light or transpired with D2O prior to measurements,
exhibited considerably smaller repeat distances, typically
between 210 and 230 Å, ruling out a stromal membrane
origin. Similar values were obtained on isolated tobacco and
spinach protoplasts. When NaCl was used as osmoticum, the
Bragg peaks of isolated thylakoid membranes almost coincided
with those in the same batch of leaves and the repeat
distances were very close to the electron microscopically
determined values in the grana. Although neutron scattering
and electron microscopy yield somewhat different values,
which is not fully understood, we can conclude that
small-angle neutron scattering is a suitable technique to
study the periodic organization of granal thylakoid
membranes in intact leaves under physiological conditions
and with a time resolution of minutes or shorter. We also
show here, for the first time on leaves, that the
periodicity of thylakoid membranes in situ responds
dynamically to moderately strong illumination. This article
is part of a Special Issue entitled: Photosynthesis research
for sustainability: Keys to produce clean energy.},
cin = {JCNS (München) ; Jülich Centre for Neutron Science JCNS
(München) ; JCNS-FRM-II / Neutronenstreuung ; JCNS-1 /
ICS-1},
ddc = {570},
cid = {I:(DE-Juel1)JCNS-FRM-II-20110218 /
I:(DE-Juel1)JCNS-1-20110106 / I:(DE-Juel1)ICS-1-20110106},
pnm = {54G - JCNS (POF2-54G24)},
pid = {G:(DE-HGF)POF2-54G24},
experiment = {EXP:(DE-MLZ)KWS2-20140101},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000341474300024},
pubmed = {pmid:24508217},
doi = {10.1016/j.bbabio.2014.01.017},
url = {https://juser.fz-juelich.de/record/183572},
}