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´Ü¹éÁú ¡í ´Ü¹éÁúÁ¾·ù ¡í Äݶó°Õ ¿¤¶ó½ºÆ¾ elastin ¼¼Æ÷°ñ°Ý, ECM - ÁõÁ¡(´Ü¼ø)´Ù´ç·ù , º¹ÇÕ´Ù´ç·ù - ¼¼Æ÷´Â Fiber µ¢¾î¸®´Ù , - Äݶó°Õ Collagen , Äݶó°Õ Á¶¼º ¹× ÇÕ¼º°úÁ¤ - ¿¤¶ó½ºÆ¾ elastin, Proteoglycan 1. collagen fibers give ECM great tensile strength and produce strong and sometimes rigid tissues 2. some tissues need to be highly flexible -eg: lung tissue, -eg: arteries, -eg: intestines -eg: muscles 3. elasticity provided by the "elastins" 4. elastins = family of elastic fibers rich in glycine and proline and located in the ECM -elastins have no hydroxylated proline -elastins have no hydroxylysine -elastins are crosslinked through their lysine residues 5. structure of elastins -relaxed conformation -polypeptide backbone has many bends due many proline residues -some crosslink through occasional lysine residues -stretched conformation -covalent crosslinks keep the elastin fibers connected -bends and twists are "pulled out" -elastin fibers become more linear -tension removed -elastin fibers snap back into their relaxed configuration |
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