[gmx-users] a question about membrane simulation

[Albert]

Dear:

   I am reading a membrane protein simulation paper by GROMACS which
published on PLOS Computational Biology (
http://www.ploscompbiol.org/article/info%3Adoi%2F10.1371%2Fjournal.pcbi.1001053
),
titled 'Predicting Novel Binding Modes of Agonists to β Adrenergic
Receptors Using All-Atom Molecular Dynamics Simulations', PLoS Comput Biol
7(1): e1001053. doi:10.1371/journal.pcbi.1001053. The author performed a
800 ns large scale MD simulation in GROMACS and obtained some residues'
conformations changes during the long time simulations.

   I found a very strange phenomena in this paper,i.e: in supplementary
figure S4,(
http://www.ploscompbiol.org/article/fetchSingleRepresentation.action?uri=info:doi/10.1371/journal.pcbi.1001053.s007)
the author indicated us the chi angle change of a Phe. As we can see
from
the plot that the conformation of this residue in 40-50 ns is the same with
that at 700-800 ns which has been conclude to be something active. So, I am
wondering, does such phenomena frequently happen in general membrane
protein simulation? Why this active conformation absent during 60-700 ns
period and present again in 700-800 time scale level? Can we also expect
that around 50 ns time scale level, agonist bound GPCR should also expect
such kind of side chain switches and it may lost at 100 ns time scale?

  I would be very appreciated if someone could give me some comments on
this issue.

Thank you very much

best wishes
Albert
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