Gliadin

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Gliadin

Gliadin is a glycoprotein

Glycoprotein

Not to be confused with peptidoglycan or proteoglycan.Glycoproteins are proteins that contain oligosaccharide chains covalently attached to their Peptide side-chains....
present in wheat

Wheat

Wheat , is a worldwide cultivated Poaceae from the Levant region of the Middle East. Globally, after maize, wheat is the second most-produced food among the cereal just above rice....
and several other cereal

Cereal

Cereals, or cereal grains, are mostly Poaceae cultivated for their edible brans or fruit seeds . Cereal grains are grown in greater quantities and provide more energy worldwide than any other type of crop; they are therefore staple foods....
s within the grass genus Triticum. Gliadins are prolamin

Prolamin

Prolamins are a group of plant storage proteins having a high proline content and found in the seeds of cereal grains: wheat , barley , rye , corn and as a minor protein, avenin in oats....
s and are separated on the basis of electrophoretic

Electrophoresis

Electrophoresis is the best-known electrokinetic phenomena. It was discovered by Reuss in 1807. He observed that clay particles dispersed in water migrate under influence of an applied electric field....
mobility and isoelectric focusing

Isoelectric focusing

Isoelectric focusing , also known as electrofocusing, is a technique for separating different molecules by their electric charge differences....
.

dins are known for their role, along with glutenin

Glutenin

Glutenin is the glutelin derived from wheat. Gluteninis a protein best known for its role, along with gliadin, in the creation of gluten with its disulfide inter- and intra-molecule links....
, in the formation of gluten

Gluten

Gluten is a composite of the proteins gliadin and glutenin. These exist, conjoined with starch, in the endosperms of some Triticeae glutens cereal, notably wheat, rye, and barley....
. It is slightly soluble in ethanol

Ethanol

Ethanol, also called ethyl alcohol, pure alcohol, grain alcohol, or drinking alcohol, is a volatility , flammable, colorless liquid....
and contains only intramolecule disulfide

Disulfide

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Types

a-/ß-gliadins - soluble in low percentage alcohols.
?-gliadins - ancestral form of cysteine-rich gliadin with only intrachain disulfide bridges
?-gliadins - soluble in higher percentages, 30–50% acidic acetonitrile.

Metabolism

Gliadins are known for their role, along with glutenin

Glutenin

Gluten

Ethanol

Ethanol, also called ethyl alcohol, pure alcohol, grain alcohol, or drinking alcohol, is a volatility , flammable, colorless liquid....
and contains only intramolecule disulfide

Disulfide

In chemistry, a disulfide usually refers to the structural unit composed of a linked pair of sulfur atoms. The disulfide anion is S22-....
links. These proteins are essential to giving bread the ability to rise properly and fix shape on cooking. They are also some of the best examples of food-derived pathogenesis. People with gluten-sensitive enteropathy (the severe form of which is coeliac disease

Coeliac disease

C?liac disease , also spelled celiac disease, is an Autoimmunity disorder of the small intestine that occurs in Genetic predisposition people of all ages from middle infancy on up....
) are sensitive to a, ß, and ? gliadins. Those with wheat-dependent (WD) exercise-induced anaphylaxis

Gluten sensitivity

Gluten sensitivity encompasses a collection of medical conditions in which gluten has an adverse effect. For individuals with gluten-sensitive enteropathy, removal of gluten generally results in the restoration of Intestinal villus or lower lymphocyte count in the intestine....
, WD urticaria

Gluten sensitivity

Gliadin can also serve as a useful delivery method for sensitive enzymes (such as superoxide dismutase

Superoxide dismutase

The enzyme superoxide dismutase , catalyzes the dismutation of superoxide into oxygen and hydrogen peroxide. As such, it is an important antioxidant defense in nearly all cells exposed to oxygen....
, which is fused with gliadin to form glisodin

Glisodin

Glisodin is a nutritional supplement based on two constituents:* Cantaloupe extract, which typically contains high quantities of the enzyme superoxide dismutase ...
) -- this helps protect them from stomach acids which cause breakdown.

For useful description of the gliadins see:

Triticeae glutens
Triticeae glutens

Triticeae glutens are seed storage proteins found in mature seeds of grass tribe Triticeae. Seed glutens of non-Triticeae plants have varieties of similar properties, but none singly can perform on a par with those of the Triticeae taxa, particularly the triticum species ....
Immunochemistry of gluten
Gluten immunochemistry

The immunochemistry of triticeae glutens is important in several inflammatory diseases. It can be subdivided into innate responses , MHC class II mediated presentation , MHC class I meditiated stimulation of killer cells, and antibody recognition....

Deamidated Gliadin

Deamidated gliadin is produced by acid or enzymatic treatment of gluten. The enzyme tissue transglutaminase
Tissue transglutaminase

Tissue transglutaminase is an enzyme of the transglutaminase family. Like other transglutaminases, it crosslinks proteins between an ε-amino group of a lysine residue and a γ-carboxamide group of glutamine residue, creating an inter- or intramolecular bond that is highly resistant to proteolysis ....
converts some of the abundant glutamine

Glutamine

Glutamine is one of the 20 amino acids encoded by the standard genetic code. Its side chain is an amide formed by replacing the side-chain hydroxyl of glutamic acid with an amine functional group....
s to glutamic acid

Glutamic acid

Glutamic acid is one of the 20 proteinogenic amino acids and its codons are GAA and GAG. It is a non-essential amino acid. The carboxylate anions and salt of glutamic acid are known as glutamates....
. This is done because gliadins are soluble in alcohol and cannot be mixed with other foods (like milk) without changing the foods qualities. Deamidated gliadin

Triticeae glutens

Triticeae glutens are seed storage proteins found in mature seeds of grass tribe Triticeae. Seed glutens of non-Triticeae plants have varieties of similar properties, but none singly can perform on a par with those of the Triticeae taxa, particularly the triticum species ....
is soluble in water. The cellular immunity to deamidated a-/ß-gliadin is much greater than a/ß-gliadin and can result in symptomatic gluten-sensitive enteropathy.

Gliadin

Types

Metabolism

Deamidated Gliadin

See also

External links