Printed m U.S.A. Nuclear Magnetic Resonance of Hemeprotein Crystals STRUCTURE OF THE HEME IN PHYSETER CATODON FERRIMYOGLOBIN AND AN ANALYSIS OF

We report the observation of deuterium Fourier transform NMR spectra (obtained by the quadrupole echo method at 8.5 Tesla, corresponding to a 'H reso-nance frequency of 55.3 MHz) of [meso-a,~,y,S-'&], [methyl-1,3-'H6], and [methylene-6,7-b-'H4]herne-la-beled aquoferrimyoglobin microcrystals (in-90 % sat-urated (N&)2S04 at pH 6.8) from Physeter cutodon, using the method of magnetic ordering (Rothgeb, T. M., and Oldfield, E. (1981) J Biol. Chem 256, 1432-1446). The results, together with those obtained on suitable diamagnetic derivatives, permit partial determination of the static organization of the heme, and the results obtained are in good agreement with those obtained using x-ray crystallography (Takano, T. (1977) J. Mol. Biol. 110, 537-568). We show that resonances near th