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- W2035449849 abstract "All the nitrogen signals from the amino acid side chains and 80 of the total of 98 backbone nitrogen signals of the oxidized form of the 2Fe.2S* ferredoxin from Anabaena sp. strain PCC 7120 were assigned by means of a series of heteronuclear two-dimensional experiments [Oh, B.-H. Mooberry, E. S., & Markley, J. L. (1990) Biochemistry (second paper of three in this issue )]. Two additional nitrogen signals were observed in the one-dimensional 15N NMR spectrum and classified as backbone amide resonances from residues whose proton resonances experience paramagnetic broadening. The one-dimensional 15N NMR spectrum shows nine resonances that are hyperfine shifted and broadened. From this inventory of diamagnetic nitrogen signals and the available X-ray coordinates of a related ferredoxin [Tsukihara, T., Fukuyama, K., Nakamura, M., Katsube, Y., Tanaka, N., Kakudo, M., Wada, K., Hase, T., & Matsubara, H. (1981) J. Biochem. 90, 1763-1773], the resolved hyperfine-shifted 15N peaks were attributed to backbone amide nitrogens of the nine amino acids that share electrons with the 2Fe.2S* center or to backbone amide nitrogens of two other amino acids that are close to the 2Fe.2S* center. The seven 15N signals that are missing and unaccounted for probably are buried under the envelope of amide signals. 1H NMR signals from all the amide protons directly bonded to the seven missing and nine hyperfine-shifted nitrogens were too broad to be resolved in conventional 2D NMR spectra.(ABSTRACT TRUNCATED AT 250 WORDS)" @default.
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- W2035449849 title "Multinuclear magnetic resonance studies of the 2Fe.cntdot.2S* ferredoxin from Anabaena species strain PCC 7120. 3. Detection and characterization of hyperfine-shifted nitrogen-15 and hydrogen-1 resonances of the oxidized form" @default.
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- W2035449849 doi "https://doi.org/10.1021/bi00468a031" @default.
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