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• W2076220003 endingPage "170" @default.
• W2076220003 startingPage "165" @default.
• W2076220003 abstract "Electron paramagnetic resonance (EPR) was used to study the environment of Mn2+ bound to the tight (n1) metal ion binding site of glutamine synthetase in the presence of analogues of the tetrahedral adduct, L-methionine (S)-sulfoximine [Met(O)(NH)-S] and L-methionine (R)-sulfoximine [Met(O)(NH)-R]. The Mn2+ EPR spectrum in the presence of Met(O)(NH)-S is identical with the previously published spectrum obtained from a mixture of isomers [Met(O)(NH)-RS] [Villafranca, J. J., Ash, D. E., & Wedler, F. C. (1976) Biochemistry 15, 544] and is characteristic of a highly octahedral metal ion environment with a small zero field splitting. The presence of Met(O)(NH)-R produces an EPR spectrum that appears characteristic of a more distorted metal ion environment, with a larger zero field splitting. These data demonstrate that the two isomers interact differently with the enzyme-bound Mn2+. Broadening of the Mn2+ EPR spectrum in the presence of Met(O)(NH) is observed in 17O-enriched water due to superhyperfine coupling of water to the metal ion. Deconvolution of the spectrum demonstrates the presence of at least a single water molecule in the inner coordination sphere of the metal ion. Superhyperfine coupling due to the 14N nucleus of the imine nitrogen of the sulfoximine moiety of Met(O)(NH)-S but not of Met(O)(NH)-R has been detected by electron spin-echo envelope modulation spectroscopy. Two intense peaks are evident in the presence of Met(O)(NH)-S with frequencies at 1.7 and 3.3 MHz. These peaks are absent when [15N]imine-labeled Met(O)(NH) is used, indicating the presence of the sulfoximine nitrogen of Met(O)(NH)-S in the inner coordination sphere of the metal ion.(ABSTRACT TRUNCATED AT 250 WORDS)" @default.
• W2076220003 created "2016-06-24" @default.
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• W2076220003 date "1988-01-01" @default.
• W2076220003 modified "2023-09-23" @default.
• W2076220003 title "Identification of nonprotein ligands to the metal ions bound to glutamine synthetase" @default.
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• W2076220003 doi "https://doi.org/10.1021/bi00401a025" @default.
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