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• W1986506616 abstract "PSI-G is an 11 kDa subunit of PSI in photosynthetic eukaryotes. Arabidopsis thaliana plants devoid of PSI-G have a decreased PSI content and an increased activity of NADP(+) photoreduction in vitro but otherwise no obvious phenotype. To investigate the biochemical basis for the increased activity, the kinetic parameters of the reaction between PSI and plastocyanin were determined. PSI-G clearly plays a role in the affinity for plastocyanin since the dissociation constant (K(D)) is only 12 muM in the absence of PSI-G compared to 32 muM for the wild type. On the physiological level, plants devoid of PSI-G have a more reduced Q(A). This indicates that the decreased PSI content is due to unstable PSI rather than an adaptation to the increased activity. In agreement with this indication of decreased stability, plants devoid of PSI-G were found to be more photo-inhibited both at low temperature and after high light treatment. The decreased PSI stability was confirmed in vitro by measuring PSI activity after illumination of a thylakoid suspension which clearly showed a faster decrease in PSI activity in the thylakoids lacking PSI-G. Light response of the P700 redox state in vivo showed that in the absence of PSI-G, P700 is more reduced at low light intensities. We conclude that PSI-G is involved in the binding dynamics of plastocyanin to PSI and that PSI-G is important for the stability of the PSI complex." @default.
• W1986506616 created "2016-06-24" @default.
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• W1986506616 date "2005-06-01" @default.
• W1986506616 modified "2023-10-16" @default.
• W1986506616 title "Photosystem I lacking the PSI-G subunit has a higher affinity for plastocyanin and is sensitive to photodamage" @default.
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• W1986506616 doi "https://doi.org/10.1016/j.bbabio.2005.02.003" @default.
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