Structural Changes of Water Molecules Upon the Reduction of Quinones in The Reaction Center from Rho

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1 Results The photosynthetic bacterial reaction center (RC) is a membrane protein complex.The RC is composed of three protein subunits and redox components such as bacteriochlorophylls, bacteriopheophytins,and quinones.The RC performs the photochemical electron transfer from the bacteriochlorophyll dimer through a series of electron donor and acceptor molecules to a secondary quinone,QB.QB accepts electrons from a primary quinone,QA,in two sequential electron transfer reactions.The second electron transfer to QB is coupled to the uptake of two protons from the cytoplasmic side,leading to the formation of the dihydroquinone QBH2 that diffuses out of the RC[1]. 1 Results The photosynthetic bacterial reaction center (RC) is a membrane protein complex. The RC is composed of three protein subunits and redox components such as bacteriochlorophylls, bacteriopheophytins, and quinones. The RC performs the photochemical electron transfer from the bacteriochlorophyll dimer through a series of electron donor and acceptor molecules to a secondary quinone, QB.QB in electrons from a primary quinone, QA, in two sequential electron transfer reactions. The second electron transfer to QB is coupled to the uptake of two protons from the cytoplasmic side, leading to the formation of the dihydroquinone QBH2 that diffuses out of the RC [1].
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