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| Description: The octahedral coordination of the iron ion. The iron and the four nitrogens from protoporphyrin IX lie nearly in a plane. A histidine (F8, or His 93) occupies one of the axial positions, and O2 the other. Schematic drawing of the heme pocket, showing the proximal (F8; His93) and distal (E7; His64) histidine side chains. Picture Stats: Views: 242 Filesize: 603.95kB Height: 500 Width: 1060 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=34116 |