Segregation of photosystems in thylakoid membranes as a critical phenomenon

Biophysical Journal
Igor RojdestvenskiGunnar Oquist

Abstract

The distribution of the two photosystems, PSI and PSII, in grana and stroma lamellae of the chloroplast membranes is not uniform. PSII are mainly concentrated in grana and PSI in stroma thylakoids. The dynamics and factors controlling the spatial segregation of PSI and PSII are generally not well understood, and here we address the segregation of photosystems in thylakoid membranes by means of a molecular dynamics method. The lateral segregation of photosystems was studied assuming a model comprising a two-dimensional (in-plane), two-component, many-body system with periodic boundary conditions and competing interactions between the photosystems in the thylakoid membrane. PSI and PSII are represented by particles with different values of negative charge. The pair interactions between particles include a screened Coulomb repulsive part and an exponentially decaying attractive part. The modeling results suggest a complicated phase behavior of the system, including quasi-crystalline phase of randomly distributed complexes of PSII and PSI at low ionic screening, well defined clustered state of segregated complexes at high screening, and in addition, an intermediate agglomerate phase where the photosystems tend to aggregate together...Continue Reading

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Citations

Jan 10, 2013·Journal of Photochemistry and Photobiology. B, Biology·Virjinia DoltchinkovaAtanas Atanassov
Jan 13, 2006·Journal of Photochemistry and Photobiology. B, Biology·Katerina StoitchkovaAtanaska Andreeva
Sep 26, 2003·Biochimica Et Biophysica Acta·Andrei BorodichGunnar Oquist
Nov 25, 2005·Photochemical & Photobiological Sciences : Official Journal of the European Photochemistry Association and the European Society for Photobiology·Wah Soon ChowJan M Anderson
Oct 28, 2019·The Biochemical Journal·Petar H Lambrev, Parveen Akhtar
May 22, 2004·Physiologia Plantarum·Per-Ake Albertsson, Eva Andreasson
Mar 5, 2021·Chemical Society Reviews·Andrea PannwitzSylvestre Bonnet

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