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KERATIN a family of fibrous structural proteins which form the exterior structure of reptiles, birds, amphibians, and mammals What is the need for Keratin? • The protein creates a hard surface • Used in hooves, hair, nails • Serve as an insulating layer to protect the delicate new keratin below dead cells because the protein is mostly formed by dead cells which body sheds as new cells pushes up underneath it Nucleotide and amino acid sequences of the 40k Da (H40) human keratin The most common amino acids found in keratins … Alananin Cysteine Glycine Intermolecular STRUCTURE hydrogen bonding APPEARANCE KERATIN IN WOOL Increased strength of the protein Disulphide bonds make Keratin Helical affects Ionic and structure hydrophobic chemical fibers insoluble in water and flexibility, resilience, cross links stabilize the protein more resistant to chemical and elasticity and wrinkling of in wet and dry conditions. physical attacks. (covalent bond of wool two thiol groups) Why I chose Keratin? Another Significance? Another important use for keratin is that its used in hair. There is a such thing as Keratin Treatment. It is used to make frizzy and curly hair, straight and smooth. Keratin makes the hair tough and insoluble due to the high amount of sulphur and the amino acid, cysteine. BIBLIOGRAPHY Pine, Chris. Why Wool? 23 Apr. 2008: n. pag. Web. 15 Oct. 2009. <http://itech.dickinson.edu/chemistry/?cat=69>. Pine, Chris. Keratin. 23 Apr. 2008: n. pag. Web. 15 Oct. 2009. <http://itech.dickinson.edu/chemistry/?cat=69>. Eckert, R. Human 40-kDa Keratin . "Sequence of the human 40-kDa keratin reveals an unusual structure with very high sequence identity to the corresponding bovine keratin." PubMed Central: 1115. N.p., n.d. Web. 15 Oct. 2009. <http://www.ncbi.nlm.nih.gov/pmc/articles/PMC279716/?page=2>.