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Alpha-keratin, or α-keratin, is a type of keratin found in mammalian vertebrates. This protein is the primary component in hairs , horns , claws , nails and the epidermis layer of the skin . α-keratin is a fibrous structural protein , meaning it is made up of amino acids that form a repeating secondary structure.
Keratin (/ ˈ k ɛr ə t ɪ n / [1] [2]) is one of a family of structural fibrous proteins also known as scleroproteins. It is the key structural material making up scales , hair , nails , feathers , horns , claws , hooves , and the outer layer of skin in vertebrates.
Beta-keratin (β-keratin) is a member of a structural protein family found in the epidermis of reptiles and birds. [1] [2] Beta-keratins were named so because they are components of epidermal stratum corneum rich in stacked beta sheets, in contrast to alpha-keratins, intermediate-filament proteins also found in stratum corneum and rich in alpha helices. [3]
The first sequences of keratins revealed that keratins could be grouped into two categories based on their sequence homologies. [1] [2] These two groups of keratins were named as type I and type II keratins. [2]
Remarkably, this was soon after the structure of the alpha helix was suggested in 1951 by Linus Pauling and coworkers. [6] These studies were published in the absence of knowledge of a keratin sequence. The first keratin sequences were determined by Hanukoglu and Fuchs in 1982. [7] [8]
Alpha-keratin; B. Beta-keratin; C ... Hair keratin; K. Keratin; Keratin 1; Keratin 2A; Keratin 3; Keratin 4; Keratin 5; Keratin 6A; ... Wikipedia® is a registered ...
At the start of the article we can read "Alpha-keratin, or α-keratin, is a type of keratin found in mammals." But it seems that the epidermal appendages of reptiles and birds are characterized by the presence of both alpha (α) and beta (β) type keratin proteins.--Furado 20:23, 24 July 2018 (UTC)
Hair keratin is a type of keratin ... central alpha-helical domain made up of four coiled-coil segments along with non-helical end-terminal domains that vary in ...