Crystallographic and spectroscopic insights into heme degradation by Mycobacterium tuberculosis MhuD.

The 2 B 2 g state of IsdI–heme–CN exhibits no intense peaks downfield of 12 ppm, whereas the 2 E g state of rHO–heme–CN has several resonances in this region, including two assigned to heme methyl groups. Thus, the downfield hyperfine-shifted resonances of MhuD–heme–CN suggest that there may be significant population of a 2 E g state in MhuD–heme–CN at 25 °C.

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