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Assignment of hyperfine shifted haem methyl carbon resonances in paramagnetic low‐spin met‐cyano complex of sperm whale myoglobin
Author(s) -
Yamamoto Yasuhiko
Publication year - 1987
Publication title -
febs letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.593
H-Index - 257
eISSN - 1873-3468
pISSN - 0014-5793
DOI - 10.1016/0014-5793(87)80202-8
Subject(s) - sperm whale , myoglobin , chemistry , heteronuclear molecule , hyperfine structure , nuclear magnetic resonance , crystallography , paramagnetism , electronic structure , heme , nuclear magnetic resonance spectroscopy , stereochemistry , computational chemistry , atomic physics , biochemistry , physics , quantum mechanics , enzyme
The hyperfine shifted resonances arising from all four individual haem carbons of the paramagnetic low‐spin met‐cyano complex of sperm whale myoglobin have been clearly identified and assigned for the first time with the aid of 1 H‐ 13 C heteronuclear chemical shift correlated spectroscopy. Alteration of the in‐plane symmetry of the electronic structure of haem induced by the ligation of proximal histidyl imidazole spreads the haem carbon resonances to 32 ppm at 22°C, indicating the sensitivity of those resonances to the haem electronic/molecular structure. Those resonances are potentially powerful probes in characterizing the nature of haem electronic structure.