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Diversity of Antigen Receptors01:28

Diversity of Antigen Receptors

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Antigen receptors are essential components of the immune system crucial in defending the body against foreign invaders. These receptors are present on the surface of B and T cells, enabling them to recognize antigens and mount an appropriate immune response.
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The ABO blood group system is a critical element of transfusion medicine, essential for determining blood compatibility in transfusions and organ transplants. It is based on specific antigens, or agglutinogens, present on the surface of red blood cells (RBCs) and corresponding antibodies, or agglutinins, in the blood plasma.
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Cell-surface receptors, also known as transmembrane receptors, are cell surface, membrane-anchored (integral) proteins that bind to external ligand molecules. This type of receptor spans the plasma membrane and performs signal transduction, converting an extracellular signal into an intracellular signal. Ligands that interact with cell-surface receptors do not have to enter the cell that they affect. Cell-surface receptors are also called cell-specific proteins or markers because they are...
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Allosteric proteins have more than one ligand binding site; the binding of a ligand to any of these sites influences the binding of ligands to the other sites. When a protein is allosteric, its binding sites are called coupled or linked.  In the case of enzymes, the site that binds to the substrate is known as the active site and the other site is known as the regulatory site. When a ligand binds to the regulatory site, this leads to conformational changes in the protein that can influence...
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Internal Receptors

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ABO Antigens Active Tri- and Disaccharides Microarray to Evaluate C-type Lectin Receptor Binding Preferences.

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This study synthesized ABO blood group antigens to explore their binding with C-type lectin receptors. Distinct glycosylation patterns on galactose and fucose are crucial for Ca2+-dependent immune interactions.

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Area of Science:

  • Immunology
  • Glycobiology
  • Carbohydrate Chemistry

Background:

  • C-type lectin receptors (CLRs) play critical roles in immune responses.
  • Gram-negative bacteria utilize molecular mimicry, expressing blood group antigens to evade immune detection.
  • Understanding CLR-glycan interactions is vital for immune modulation strategies.

Purpose of the Study:

  • To synthesize ABO blood group antigen active tri- and disaccharides.
  • To investigate the binding specificity of these glycans with various CLRs.
  • To elucidate the role of glycosylation and calcium ions in these interactions.

Main Methods:

  • Chemical synthesis of ABO blood group antigen active tri- and disaccharides.
  • Glycan microarray analysis to determine binding preferences.
  • Assessment of calcium (Ca2+) dependency of CLR-glycan interactions.

Main Results:

  • Demonstrated specific binding preferences between synthesized ABO blood group antigens and CLRs.
  • Identified distinct glycosylation on galactose and fucose motifs as critical for CLR binding.
  • Confirmed that these CLR-glycan interactions are calcium-dependent.

Conclusions:

  • The synthesis of ABO blood group antigens provides tools for studying CLR interactions.
  • Specific glycosylation patterns on galactose and fucose are key determinants of CLR binding specificity.
  • Calcium ions are essential for mediating CLR-blood group antigen recognition, offering potential targets for immune modulation.