is keratin fibrous or globular? why?

Expert Solution

keratin is fibrous.The final β-pleated sheet structure of silk is the result of the interaction of many individual protein chains. Specifically, hydrogen bonding on amide groups on different chains is the basis of β-pleated sheet in silk proteins.

Keratin is the major structural fibrous protein to form wool,hair, nails,feathers and horns of many kinds of animals, and has a large concentration of cysteine, 7 - 20% of the total amino acid residues, that form inter-and intra-molecular disulfide bonds

keratins in wool and hair are composed of coiled α helical protein chains with other various coils analogous to those found in a rope. Other keratins are found in skin, fur,wool,hair,claws, nails, hooves, horns, scales, beaks, feathers, actin and mysin in muscle tissues and fibrinogen needed for blood clots.

Keratin has two main functions:

to adhere cells to each other and it forms a protective layer on the outside of the skin. In epithelial cells.
keratin proteins inside the cell attach to proteins called desmosomes on the surface.

gladiator answered 2 years ago

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