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Ultrastructural modeling of small angle scattering from photosynthetic membranes

Jakubauskas, Dainius (författare)
Univ Copenhagen, Niels Bohr Inst, DK-2100 Copenhagen, Denmark.;Univ Copenhagen, Copenhagen Plant Sci Ctr, Dept Plant & Environm Sci, DK-1871 Copenhagen, Denmark.,University of Copenhagen
Kowalewska, Lucja (författare)
Univ Warsaw, Fac Biol, Inst Expt Plant Biol & Biotechnol, Dept Plant Anat & Cytol, Warsaw, Poland.,University of Warsaw
Sokolova, Anna, V (författare)
ANSTO, Australian Ctr Neutron Scattering, Sydney, NSW 2234, Australia.,Australian Nuclear Science and Technology Organisation
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Garvey, Christopher J. (författare)
Malmö University,Lund University,Lunds universitet,Malmö universitet,Institutionen för biomedicinsk vetenskap (BMV),Biofilms Research Center for Biointerfaces,ANSTO, Australian Ctr Neutron Scattering, Sydney, NSW 2234, Australia.;Lund Inst Adv Neutron & Xray Scattering, Lund, Sweden.,Fysikalisk kemi,Enheten för fysikalisk och teoretisk kemi,Kemiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,LINXS - Institute of advanced Neutron and X-ray Science,Physical Chemistry,Physical and theoretical chemistry,Department of Chemistry,Departments at LTH,Faculty of Engineering, LTH,Faculty of Engineering, LTH,Australian Nuclear Science and Technology Organisation
Mortensen, Kell (författare)
Univ Copenhagen, Niels Bohr Inst, DK-2100 Copenhagen, Denmark.,University of Copenhagen
Jensen, Poul Erik (författare)
Univ Copenhagen, Copenhagen Plant Sci Ctr, Dept Plant & Environm Sci, DK-1871 Copenhagen, Denmark.,University of Copenhagen
Kirkensgaard, Jacob J. K. (författare)
Univ Copenhagen, Niels Bohr Inst, DK-2100 Copenhagen, Denmark.;Univ Copenhagen, Dept Food Sci, DK-1871 Copenhagen, Denmark.,University of Copenhagen
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Univ Copenhagen, Niels Bohr Inst, DK-2100 Copenhagen, Denmark;Univ Copenhagen, Copenhagen Plant Sci Ctr, Dept Plant & Environm Sci, DK-1871 Copenhagen, Denmark. University of Copenhagen (creator_code:org_t)
2019-12-18
2019
Engelska.
Ingår i: Scientific Reports. - : Nature Publishing Group. - 2045-2322. ; 9
Relaterad länk:
https://doi.org/10.1...
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https://mau.diva-por... (primary) (Raw object)
https://www.nature.c...
http://dx.doi.org/10... (free)
https://urn.kb.se/re...
https://doi.org/10.1...
https://lup.lub.lu.s...
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  • Tidskriftsartikel (refereegranskat)
Abstract Ämnesord
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  • The last decade has seen a range of studies using non-invasive neutron and X-ray techniques to probe the ultrastructure of a variety of photosynthetic membrane systems. A common denominator in this work is the lack of an explicitly formulated underlying structural model, ultimately leading to ambiguity in the data interpretation. Here we formulate and implement a full mathematical model of the scattering from a stacked double bilayer membrane system taking instrumental resolution and polydispersity into account. We validate our model by direct simulation of scattering patterns from 3D structural models. Most importantly, we demonstrate that the full scattering curves from three structurally typical cyanobacterial thylakoid membrane systems measured in vivo can all be described within this framework. The model provides realistic estimates of key structural parameters in the thylakoid membrane, in particular the overall stacking distance and how this is divided between membranes, lumen and cytoplasmic liquid. Finally, from fitted scattering length densities it becomes clear that the protein content in the inner lumen has to be lower than in the outer cytoplasmic liquid and we extract the first quantitative measure of the luminal protein content in a living cyanobacteria.

Ämnesord

NATURVETENSKAP  -- Biologi -- Biokemi och molekylärbiologi (hsv//swe)
NATURAL SCIENCES  -- Biological Sciences -- Biochemistry and Molecular Biology (hsv//eng)

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