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The collagen protein is composed of a triple helix, which generally consists of two identical chains (α1) and an additional chain that differs slightly in its chemical composition (α2). [23] The amino acid composition of collagen is atypical for proteins, particularly with respect to its high hydroxyproline content.
A few other proteins are also sometimes called albumins. They are not in the same family as vertebrate albumins: Ovalbumin is a storage protein in egg white (albumen). It is a serpin. Lactalbumin, or whey protein, is a protein fraction of milk. It is mainly Beta-lactoglobulin, although serum albumin also comprises a small part of it.
Collagen XVII is a homotrimer of three alpha1(XVII)-chains [11] and a transmembrane protein in type II orientation. Each 180 kD a-chain contains a globular intracellular domain of approximately 70 kDa, which interacts with beta4-integrin, plectin, and BP230 [12] [13] and is necessary for the stable attachment of hemidesmosomes to keratin intermediate filaments.
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 and was the first amino acid to be ...
The triple-helical conformation, which is a characteristic feature of all fibrillar collagens, is possible because of the presence of glycine as every third amino acid in the sequence of about 1000 amino acids. When the right-handed super-helix is formed, the glycine residues of each of the monomers are positioned at the center of the super ...
Collagen, type VII, alpha 1 forms a complex network with several other proteins in the basement membrane. [6] It has been shown to interact with laminin 5 [21] and fibronectin, as well as collagen IV, by binding these proteins in the NC-1 domain.
Type I collagen is the most abundant collagen of the human body, consisting of around 90% of the body's total collagen in vertebrates. Due to this, it is also the most abundant protein type found in all vertebrates. Type I forms large, eosinophilic fibers known as collagen fibers, which make up most of the rope-like dense connective tissue in ...
Ovalbumin (abbreviated OVA [1]) is the main protein found in egg white, making up approximately 55% of the total protein. [2] Ovalbumin displays sequence and three-dimensional homology to the serpin superfamily, but unlike most serpins it is not a serine protease inhibitor. [3]