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- W2060786502 abstract "In oxygenic photosynthetic cells, carbon metabolism is regulated by a light-dependent redox signaling pathway through which the light signal is transmitted in the form of electrons via a redox chain comprising ferredoxin (Fd), ferredoxin:thioredoxin reductase (FTR), and thioredoxin (Trx). Trx affects the activity of a variety of enzymes via dithiol oxidation and reduction reactions. FTR reduces an intramolecular disulfide bridge of Trx, and Trx reduction involves a transient cross-link with FTR. NMR spectroscopy was used to investigate the interaction of Fd, FTR, and an m-type Trx. NMR titration experiments indicate that FTR uses distinct sites to bind Fd and Trx simultaneously to form a noncovalent ternary complex. The orientation of Trx-m relative to FTR was determined from the intermolecular paramagnetic broadening caused by the [4Fe-4S] cluster of FTR. Two models of the noncovalent binary complex of FTR/Trx-m based on the paramagnetic distance restraints were obtained. The models suggest that either a modest or major rotational movement of Trx must take place when the noncovalent binary complex proceeds to the covalent complex. This study demonstrates the complementarity of paramagnetic NMR and X-ray diffraction of crystals in the elucidation of dynamics in a transient protein complex." @default.
- W2060786502 created "2016-06-24" @default.
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- W2060786502 date "2009-11-12" @default.
- W2060786502 modified "2023-10-14" @default.
- W2060786502 title "Ternary Protein Complex of Ferredoxin, Ferredoxin:Thioredoxin Reductase, and Thioredoxin Studied by Paramagnetic NMR Spectroscopy" @default.
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- W2060786502 doi "https://doi.org/10.1021/ja904205k" @default.
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