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Oxygen Transport in the Blood

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,...

Hemoglobin

Hemoglobin

Hemoglobin is a globular protein made up of four subunits. Two of these subunits are alpha chains, and the other two are beta chains. Each subunit contains a molecule of heme, which has an iron atom and can bind to oxygen. When an oxygen molecule binds to one heme group, it changes the shape of hemoglobin, making it easier for the other heme groups to bind oxygen as well.
When all four heme groups are bound to oxygen, the resulting molecule is called oxyhemoglobin. As a result, arterial blood...

Respiration and Gaseous Exchange

Respiration and Gaseous Exchange

The intricate interplay between the cardiovascular and respiratory systems is crucial for efficiently transporting respiratory gases throughout the body. Let us explore the cardiovascular system's multifaceted functions, emphasizing its pivotal role in gas exchange.
Respiration involves the exchange of gases, especially oxygen (O2) and carbon dioxide (CO2), between the alveoli and body cells, a process facilitated by blood circulation. As a result, the cardiovascular system, which involves the...

Gas Exchange and Transport

Gas Exchange and Transport

Gas exchange, the intake of molecular oxygen (O2) from the environment and the outflow of carbon dioxide (CO2) into the environment, is necessary for cellular function. Gas exchange during respiration occurs largely via the movement of gas molecules along pressure gradients. Gas travels from areas of higher partial pressure to areas of lower partial pressure. In mammals, gas exchange occurs in the alveoli of the lungs, which are adjacent to capillaries and share a membrane with them.

Hypoxia

Hypoxia

Hypoxia is a medical condition characterized by an inadequate oxygen supply to body tissues. It typically manifests as a bluish discoloration of the skin and mucosae, especially in fair-skinned individuals, when hemoglobin (Hb) saturation drops below 75%.
Types of Hypoxia
There are four primary types of hypoxia, each resulting from a different cause:
1. Anemic hypoxia: This type occurs due to insufficient oxygen delivery caused by a lack of red blood cells (RBCs) or RBCs with abnormal or...

Protein and Protein Structure

Protein and Protein Structure

Proteins are one of the most abundant organic molecules in living systems and have the most diverse range of functions of all macromolecules. Proteins may be structural, regulatory, contractile, or protective. They may serve in transport, storage, or membranes; or they may be toxins or enzymes. Their structures, like their functions, vary greatly. They are all, however, amino acid polymers arranged in a linear sequence.
A protein's shape is critical to its function. For example, an enzyme can...

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Related Experiment Video

Updated: May 16, 2026

Characterization of Sickling During Controlled Automated Deoxygenation with Oxygen Gradient Ektacytometry

Characterization of Sickling During Controlled Automated Deoxygenation with Oxygen Gradient Ektacytometry

Published on: November 5, 2019

Oxygen migration pathways in NO-bound truncated hemoglobin.

Pierre-André Cazade¹, Markus Meuwly

¹Department of Chemistry, University of Basel, Klingelbergstrasse 80, CH-4056, Basel, Switzerland.

Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry

|November 20, 2012

Summary

This summary is machine-generated.

Atomistic simulations reveal dioxygen (O2) migration pathways in Mycobacterium tuberculosis hemoglobin. O2 enters via channel I and exits via channel II, utilizing a novel docking site near the heme iron.

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Last Updated: May 16, 2026

Characterization of Sickling During Controlled Automated Deoxygenation with Oxygen Gradient Ektacytometry

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Published on: June 14, 2024

Area of Science:

Biophysics
Computational Biology
Biochemistry

Background:

Mycobacterium tuberculosis truncated Hemoglobin N (trHbN) is a key protein involved in gas transport.
Understanding dioxygen (O2) and nitric oxide (NO) dynamics is crucial for drug development against tuberculosis.

Purpose of the Study:

To investigate the atomistic pathways and dynamics of O2 migration in NO-bound trHbN.
To identify metastable states and connectivity networks for O2 localization within the protein.

Main Methods:

Atomistic simulations exceeding 100 ns.
Analysis of O2 ligand connectivity networks and metastable states.
Identification of protein residues and pockets involved in O2 transport.

Main Results:

Channel I identified as the primary O2 entrance, and channel II as the main exit.
A novel O2 docking site, distinct from NO binding sites, was discovered near the heme iron.
Free energy barriers for O2 migration between states are low (≈1.5 kcal/mol), facilitating movement.

Conclusions:

O2 migration in trHbN is facilitated by specific channels and a newly identified docking site.
Phe62 acts as a gatekeeper for O2 entry through channel I.
The findings support experimental evidence for alternative O2 docking pockets, distinct from NO binding sites.