...-subunit LH1 ring in which each αβ heterodimer binds two bacteriochlorophylls and, unusually for currently reported complexes, two carotenoids rather than one. Although the extra carotenoids confer an advantage in terms of photoprotection and light harvesting, they could impede passage of quinones through...

... the RC, with a preferential binding site for a quinone, designated Q P , on the inner face of the encircling LH1 complex. Quinols, initially generated at the RC Q B site, are proposed to transiently occupy the Q P site prior to traversing the LH1 barrier and diffusing to the cytochrome bc 1 complex. Thus...

..., turnover rates with N 6 -(2-isopentenyl)adenine of approx. 150 s −1 could be obtained. This suggests that the natural electron acceptor of the enzyme is quite probably a p -quinone or similar compound. By using the stopped-flow technique, it was found that the enzyme is rapidly reduced by N 6 -(2...