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Hemoglobin01:24

Hemoglobin

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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.
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Structure and Function of Erythrocytes01:29

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There are between 4.2 and 6 million erythrocytes, also known as red blood cells, in every microliter of blood. These cells are small, flattened biconcave discs with centers that are depressed.
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Protein and Protein Structure02:15

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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.
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In organisms, proteins are the most abundant macromolecules. They act as the building blocks of life and play various crucial roles in the body. Proteins can be broadly classified into two distinct subtypes based on their shape and solubilities: globular proteins and fibrous proteins.
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Oxygen Transport in the Blood01:27

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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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Gene families consist of groups of genes proposed to have originated from a common ancestor. Typically these arise through events in which a gene or genes are mistakenly duplicated during cell division. Unlike their parent genes (which are subject to selection pressure to maintain function), these gene copies do not need to preserve their sequences and may evolve at a relatively faster rate.
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Measurement of Heme Synthesis Levels in Mammalian Cells
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Structure and function of haemoglobins.

David A Gell1

  • 1School of Medicine, University of Tasmania, TAS 7000, Australia.

Blood Cells, Molecules & Diseases
|November 12, 2017
PubMed
Summary

Haemoglobin (Hb) proteins are found across all life, not just in mammalian blood for oxygen transport. This review explores their diverse structures, functions, and roles in gas binding and signaling.

Keywords:
AllosteryCooperative oxygen bindingFlavohaemoglobinHaemHaemoglobinHexacoordinate haemModel porphyrinsMyoglobinNitric oxideOxygen bindingTruncated haemoglobin

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Evolutionary Biology

Background:

  • Haemoglobin (Hb) is primarily known for oxygen transport in mammalian red blood cells (RBCs).
  • Hb proteins represent a large, diverse family found across bacteria, archaea, and eukaryotes.
  • Understanding Hb diversity is crucial for comprehending fundamental biological processes.

Purpose of the Study:

  • To provide a comprehensive overview of haemoglobin diversity, structure, and function.
  • To introduce researchers to the broad spectrum of Hb proteins beyond mammalian systems.
  • To highlight common features and evolutionary relationships among Hbs.

Main Methods:

  • Literature review and synthesis of existing research on haemoglobin.
  • Classification of Hbs based on structural and functional characteristics.
  • Analysis of O2 binding, ligand selectivity, and enzymatic activities.

Main Results:

  • Detailed classification of various Hb types, including hexacoordinate, bacterial truncated, and flavohaemoglobins.
  • Explanation of O2 binding affinity, selectivity for ligands (O2/NO/CO), and enzymatic reactions with bioactive gases.
  • Discussion of sensor Hbs and their roles in cellular signaling.
  • Exploration of the structural basis for allosteric O2 binding in mammalian RBC Hb and kinetic models.

Conclusions:

  • Haemoglobin is a versatile protein superfamily with diverse roles beyond oxygen transport.
  • Hb research spans multiple domains of life, revealing conserved and divergent functions.
  • Continued investigation into Hb structure-function relationships offers insights into evolution and biological mechanisms.