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Hemoglobin & Myoglobin: 2. Myoglobin
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Hemoglobin & Myoglobin: 2. Myoglobin

Myoglobin
  • Single polypeptide that comprises 8 alpha-helix segments.
  • Here, we see a representative heme group: an iron center and a porphyrin ring.
  • The iron in the heme group is bound to the following:
– A histidine of one of the alpha helices in myoglobin (specify it as the proximal histidine). – Oxygen, which is held in place by the histidine of another alpha helix in myoglobin (we specify it as the distal histidine).
  • The hydrogen in histidine binds oxygen.
  • The nitrogen binds the positively charged iron.

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