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Immunoglobulin A (Ig A, also referred to as sIgA in its secretory form) is an antibody that plays a role in the immune function of mucous membranes. The amount of IgA produced in association with mucosal membranes is greater than all other types of antibody combined. [ 3 ]
Immunoglobulin heavy constant alpha 1 is a immunoglobulin gene with symbol IGHA1. [3] It encodes a constant (C) segment of Immunoglobulin A heavy chain. Immunoglobulin A is an antibody that plays a critical role in immune function in the mucous membranes. IgA shows the same typical structure of other antibody classes, with two heavy chains and ...
Schematic of immunoglobulin A dimer showing H-chain (blue), L-chain (red), J-chain (magenta) and secretory component (yellow). The secretory component is a component of immunoglobulin A (IgA). Secretory component is a proteolytic cleavage product of the polymeric immunoglobulin receptor which remains associated with dimeric IgA in sero-mucus ...
It has 8 cysteine residues, 6 of which are involved in intramolecular disulfide bonds while the remaining two function to bind the Fc tailpiece regions of IgA or IgM antibodies, the α chain and μ chain respectively. An N-linked carbohydrate resulting from N-glycosylation is also essential in the protein's incorporation to antibody polymers. [12]
Isotype or class switching is a biological process occurring after activation of the B cell, which allows the cell to produce different classes of antibody (IgA, IgE, or IgG). [64] The different classes of antibody, and thus effector functions, are defined by the constant (C) regions of the immunoglobulin heavy chain.
The natural substrate of IgA proteases is immunoglobulin A, hence its name. The enzyme is in fact capable of cleavage of proteins with the amino acid sequence Cleaves N-X-Z-Pro-Pro/-Y-Pro-C, where the X in the sequence preferably is a Proline or Serine ; the Y = Threonine , Serine or Alanine ; and Z preferably is Arginine or Threonine .
IgA antibody. Basic immune response in the gut. In the gut, ... into the underlying tissue. Antigen sampling is a key function of Peyer’s patches.
Selective immunoglobulin A (IgA) deficiency (SIgAD [1]) is a kind of immunodeficiency, a type of hypogammaglobulinemia. People with this deficiency lack immunoglobulin A (IgA), a type of antibody that protects against infections of the mucous membranes lining the mouth, airways, and digestive tract.
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