Abstract
15N-1H 1J couplings were measured at 500 MHz and 800 MHz for 15N enriched oxidized cytochrome b 562 from E. coli. The magnetic field dependence of 70 1J values, which could be measured without signal overlap, shows that there is a molecular magnetic anisotropy which provides partial molecular orientation in the magnetic field and, consequently, residual dipolar couplings (rdc). The rdc were used as further constraints to improve the existing structure [Arnesano et al. (1999) Biochemistry, 38, 8657–8670] with a protocol which uses the rhombic anisotropy [Banci et al. (1998) J. Am. Chem. Soc., 120, 12903–12909]. The overall large molecular magnetic anisotropy has been found to be determined by both the low spin iron (III) and the four helix bundle structure magnetic susceptibility anisotropy contributions.
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Arnesano, F., Banci, L., Bertini, I. et al. The auto-orientation in high magnetic fields of oxidized cytochrome b562 as source of constraints for solution structure determination. J Biomol NMR 17, 295–304 (2000). https://doi.org/10.1023/A:1008308501053
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DOI: https://doi.org/10.1023/A:1008308501053