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- W2021202008 abstract "The appearance of ESR signals from Photosystem I (PS I) electron acceptors A1 and A0 in water or deuterium oxide suspension was followed using a low-temperature photoaccumulation technique. In deuterated samples the A1 signal was narrowed by a factor of 0.66 compared with the control. This effect was fully reversible upon resuspension of treated samples in H2O. The narrow ESR signal from deuterated A1 had similar power saturation characteristics to the normal signal; however, a signal from a second component resolved by deuteration was saturated at higher microwave powers than the control. The power saturation behaviour of A−1 in un-modified reaction centres indicated that it is an anionic semiquinone in a ‘protic’ environment. Deuteration reversibly modified the relative extents of reduction of iron sulphur electron acceptors A and B such that centre B became the more stable electron acceptor. The g-value and line-width of iron sulphur centre X was not modified by deuteration although it appeared to become more efficiently reduced. These results are discussed in the light of current evidence from optical, electron spin polarisation and extraction experiments that suggest that A1 is a quinone, probably vitamin K-1." @default.
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- W2021202008 date "1987-12-01" @default.
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- W2021202008 title "ESR characteristics of Photosystem I in deuterium oxide: Further evidence that electron acceptor A1 is a quinone" @default.
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- W2021202008 doi "https://doi.org/10.1016/0005-2728(87)90131-9" @default.
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