Lecture8 - Lecture 8 1/23/09 Outline Sheet Ribbon models of...

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Unformatted text preview: Lecture 8 1/23/09 Outline Sheet Ribbon models of proteins Tertiary structure (III o structure) Bonds involved in stabilization of tertiary structure Protein denaturation Renaturation of proteins Sheet Other ways of coiling peptide chains are possible. If heat -keratin and stretch it, get different x-ray diffraction data. called -keratin. There is thermal breaking of the hydrogen bonds and it stretches into a zig zag shape, called a sheet. Two types: Antiparallel Parallel Get hydrogen bonding between the strands. All peptide linkages participate. The R groups alternately project above and below the plane of the sheet. Often called pleated sheet. Ribbon models of proteins Ribbon models are often used to demonstrate the secondary structure characteristics of particular proteins. A protein composed almost entirely of helices. A protein composed of a mixture of helices and parallel sheets. A portion of a protein composed of a sandwich of two antiparallel sheets....
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Lecture8 - Lecture 8 1/23/09 Outline Sheet Ribbon models of...

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