martedì 23 maggio 2017

# s-phyto: the three ways of the plastoquinone inside the photosystem II complex

<< The surprise in this process was the seemingly uncoordinated way in which it happens. 'The idea in the field was that there were two channels through which plastoquinone could pass - one would be the entrance, the other the exit', says Marrink [Siewert J.  Marrink]. As it turned out, there were three channels which could all be used to enter or leave the complex. >>

<< Any plastoquinone molecules in the membrane would quickly enter the photosystem II (PSII) complex, but might leave it again without electrons, or hover around inside the complex for a while before finally binding in the exchange cavity, where it could accept electrons. Marrink: 'It is all very much dominated by entropy.' >>

University of Groningen. Molecular dynamics simulations reveal chaos in electron transport. ScienceDaily. 10 May 2017.

Floris J. Van Eerden, Manuel N. Melo, et al. Exchange pathways of plastoquinone and plastoquinol in the photosystem II complex. Nature Communications 8, Article number: 15214 (2017) doi: 10.1038/ncomms15214


<< Nature turned out to be less orderly than we had assumed >> afferma Siewert J.  Marrink. Percio' anche il classico vasetto della nonna contenente la classica piantina talvolta perfino stitichella, sarebbe testimonianza, per un aspetto decisamente peculiare,  fondamentale della sua normale fisiologia (la fotosintesi clorofilliana), di pulsatile motore caotico ...

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