Redesigning the QA binding site of Photosystem II allows reduction of exogenous quinones.

Abstract:

:Strategies to harness photosynthesis from living organisms to generate electrical power have long been considered, yet efficiency remains low. Here, we aimed to reroute photosynthetic electron flow in photosynthetic organisms without compromising their phototrophic properties. We show that 2,6-dimethyl-p-benzoquinone (DMBQ) can be used as an electron mediator to assess the efficiency of mutations designed to engineer a novel electron donation pathway downstream of the primary electron acceptor QA of Photosystem (PS) II in the green alga Chlamydomonas reinhardtii. Through the use of structural prediction studies and a screen of site-directed PSII mutants we show that modifying the environment of the QA site increases the reduction rate of DMBQ. Truncating the C-terminus of the PsbT subunit protruding in the stroma provides evidence that shortening the distance between QA and DMBQ leads to sustained electron transfer to DMBQ, as confirmed by chronoamperometry, consistent with a bypass of the natural QA°- to QB pathway.

journal_name

Nat Commun

journal_title

Nature communications

authors

Fu HY,Picot D,Choquet Y,Longatte G,Sayegh A,Delacotte J,Guille-Collignon M,Lemaître F,Rappaport F,Wollman FA

doi

10.1038/ncomms15274

subject

Has Abstract

pub_date

2017-05-03 00:00:00

pages

15274

issn

2041-1723

pii

ncomms15274

journal_volume

8

pub_type

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