کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
10795263 1052564 2016 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Vibrational fingerprints of the Mn4CaO5 cluster in Photosystem II by mixed quantum-classical molecular dynamics
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک دانش گیاه شناسی
پیش نمایش صفحه اول مقاله
Vibrational fingerprints of the Mn4CaO5 cluster in Photosystem II by mixed quantum-classical molecular dynamics
چکیده انگلیسی
A detailed knowledge of the structures of the catalytic steps along the Kok-Joliot cycle of Photosystem II may help to understand the strategies adopted by this unique enzyme to achieve water oxidation. Vibrational spectroscopy has probed in the last decades the intermediate states of the catalytic cycle, although the interpretation of the data turned out to be often problematic. In the present work we use QM/MM molecular dynamics on the S2 state to obtain the vibrational density of states at room temperature. To help the interpretation of the computational and experimental data we propose a decomposition of the Mn4CaO5 moiety into five separate parts, composed by “diamond” motifs involving four atoms. The spectral signatures arising from this analysis can be easily interpreted to assign experimentally known bands to specific molecular motions. In particular, we focused in the low frequency region of the vibrational spectrum of the S2 state. We can therefore identify the observed bands around 600-620 cm− 1 as characteristic for the stretching vibrations involving Mn1-O1-Mn2 or Mn3-O5 moieties.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Biochimica et Biophysica Acta (BBA) - Bioenergetics - Volume 1857, Issue 10, October 2016, Pages 1669-1677
نویسندگان
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