Abstract
The role of the iron–histidine bridge in bacterial photosynthetic reaction centres has been investigated by means of ab initio computations and quantum dynamics of elementary reaction steps. Full geometry optimization and wave packet dynamics show that, upon the arrival of a photo-electron, the primary quinone takes up a proton from the H-bonded histidine in a very fast process, which occurs in a few tens of femtoseconds. The proton transfer step significantly stabilizes the charge separated state, inhibiting the backward charge recombination process. Electron transfer to the secondary quinone can then take place by switching the positions of both the H-bonded hydrogens, in a Bjerrium type mechanism involving whole hydrogen atoms rather than protons.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
