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Ovotransferrin
Ovotransferrin (conalbumin) is a glycoprotein of egg white albumen.〔(Ovotransferrin )〕 Egg white albumen is composed of multiple proteins and ovotransferrin is the most heat reliable protein of them all. It has a molecular weight of 76,000 daltons and contains about 700 amino acids. Ovotransferrin makes up approximately 13% of egg albumen. As a member of the transferrin and metalloproteinase family, ovotransferrin has been found to produce heat shock proteins. When these heat shock proteins are induced in the skin, they provide protection against cold stress and other societal stresses. Ovotransferrin is folded in a way that forms two lobes (N- and C- terminals) and each lobe consists of a binding site. Each lobe is then divided into two domains of 160 amino acid residues. Its structure also consists of fifteen disulfide crosslinks and no free sulfhydryl groups. Disulfide groups stabilize the tertiary structures of proteins. Transferrins, are iron binding proteins and acute phase reactants of animal serum.〔 It has a binding log of 15 at a pH of 7 or above, meaning that the iron binding capacity of ovotransferrin rapidly decreased at a pH that is less than 6. This family is also known for their role in cell maturation by transporting essential nutrients to developing embryos.〔 Ovotransferrin functions as an antimicrobial agent and transports iron to the developing embryo. Because they bind to iron, this makes it difficult for harmful bacteria to be nutritionally satisfied with them so it acts as an antimicrobial. The sequence of ovotransferrin is similar to that observed for serum transferrin in many species. Recently, scientists have discovered a blood serum, known as human serum, that binds to iron just like Ovotransferrin and they show 50% homology with each other, meaning that they have similar amino acid composition and similar carbohydrate content. At the C- lobe, human serum is said to have two N-glycans while the hen ovotransferrin is said to have a single N-glycan.〔 Consequently, structurally this protein differs from its serum counterpart because of its glycosylation pattern. These proteins are said to be glycosylated because they have carbohydrates attached to them. Glycosylation is the most common covalent modification (formation of chemical bonds) that occurs in living organisms. This process is determined by the structure of the protein backbone and the carbohydrate attachment site. In addition, ovotransferrin is glycosylated by the N-linkage to the amino acid known as asparagine, meaning that the glycan, the carbohydrate chain, is attached to the nitrogen on the amino acid. Asparagine, found abundantly in asparagus (hence, its name), is one of twenty of the most common amino acids on Earth and was the first amino acid to be isolated. While ovotransferrin identifies with its family, there are two types of Ovotransferrin proteins: apo and holo. Apo-Ovotransferrin is deprived of iron and holo-Ovotransferrin is saturated with iron.〔 Because the apo-ovotransferrin is iron-deprived, it is easily destroyed by physical and chemical treatments.
== References ==
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抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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