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Oxygen Transport in the Blood01:27

Oxygen Transport in the Blood

Hemoglobin (Hb) is a crucial molecule in the human body, consisting of four polypeptide chains, each bound to an iron-containing heme group. This unique structure enables hemoglobin to bind to oxygen, with each molecule capable of combining with four molecules of oxygen, leading to rapid and reversible oxygen loading. When fully loaded with oxygen, it is called oxyhemoglobin, while hemoglobin that has released oxygen is called reduced hemoglobin or deoxyhemoglobin. As hemoglobin binds oxygen,...
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Water may inhibit oxygen binding in hemoprotein models.

James P Collman1, Richard A Decréau, Abhishek Dey

  • 1Department of Chemistry, Stanford University, Stanford, CA 94305, USA. jpc@stanford.edu

Proceedings of the National Academy of Sciences of the United States of America
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Water molecules in cytochrome c oxidase (CcO) slow oxygen binding by making the ferrous heme low spin. Removing water or increasing pocket hydrophobicity enhances O(2) binding rates.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Enzyme Kinetics

Background:

  • Cytochrome c oxidase (CcO) is crucial for cellular respiration.
  • The active site of CcO contains a ferrous heme and imidazole residues.
  • Water molecules near the heme influence its electronic properties and reactivity.

Purpose of the Study:

  • To investigate the role of distal imidazole residues and water molecules in modulating ferrous heme spin state.
  • To understand the mechanism of oxygen (O2) binding kinetics in CcO.
  • To identify strategies for enhancing O2 binding rates.

Main Methods:

  • Computational modeling of cytochrome c oxidase active site.
  • Analysis of heme spin state based on molecular environment.
  • Kinetic analysis of O2 binding to ferrous heme.

Main Results:

  • Three distal imidazole residues form a pocket that binds water molecules.
  • This water cluster induces a low-spin state in the ferrous heme, slowing O2 binding.
  • A rigid proximal imidazole tail facilitates a high-spin/low-spin crossover.
  • O2 binding rate can be enhanced by removing water, increasing pocket hydrophobicity, or coordinating a metal ion to distal imidazoles.

Conclusions:

  • Water molecules in the CcO active site play a critical role in regulating heme spin state and O2 binding.
  • Modulating the hydrophobicity and water content of the gas-binding pocket offers potential for enhancing CcO activity.
  • Structural modifications involving distal imidazole coordination present a viable strategy for accelerating O2 binding.