BIOCHEM 423 Chapter 6: Biochem423 6.2-6.3
7 Dec 2018
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[ elongated molecules with welt defined secondary structures. , usually play structural roles in all t major proteins of hair and fingernails , member of internetwork. " predominantly a- helical in structure a the. Every third or fourth amino aid has a won polar , hydrophobic side chain . Pairs of these right - handed helices twist about one another in the left-handed coiled - coil structure tkmw. be#hydrophobi_csurtausof= two a- keratin helices . In some tissues a- keratin is hardened to diving degrees , by the introduction of disuttide cross links within the several levels of fiber structure a. Keratin has an unusually high content of cysteine : b - keratins contain much more b - sheet ] a fibroin. Ei g. silkworm fibers contain long regions of anti parallel p sheets with the polypeptide chains running parallel to the fiber axis glycine a collagen a tnpowuagen basic unit of the collagen fiber.
