Identification of the proton pathway in bacterial reaction centers: both protons associated with reduction of QB to QBH2 share a common entry point.

@article{Adelroth2000IdentificationOT,
  title={Identification of the proton pathway in bacterial reaction centers: both protons associated with reduction of QB to QBH2 share a common entry point.},
  author={Pia Adelroth and Mark L. Paddock and Laura Sagle and George Feher and Melvin Y Okamura},
  journal={Proceedings of the National Academy of Sciences of the United States of America},
  year={2000},
  volume={97 24},
  pages={13086-91}
}
The reaction center from Rhodobacter sphaeroides uses light energy for the reduction and protonation of a quinone molecule, Q(B). This process involves the transfer of two protons from the aqueous solution to the protein-bound Q(B) molecule. The second proton, H(+)(2), is supplied to Q(B) by Glu-L212, an internal residue protonated in response to formation of Q(A)(-) and Q(B)(-). In this work, the pathway for H(+)(2) to Glu-L212 was studied by measuring the effects of divalent metal ion binding… CONTINUE READING

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