8b - Lecture 8B: More on the secondary structure of...

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Unformatted text preview: Lecture 8B: More on the secondary structure of proteins Friday, August 20, 2010 The second commonly found element of secondary structure found in proteins is called the -sheet, which involves hydrogen bonding between spatially adjacent segments of the polypeptide backbone. Each segment of polypeptide backbone adopts a stretched-out conformation called the beta-strand: NOTE that the side chains alternate in the direction in which they point, such that the first is up, the second down, the third up, etc Friday, August 20, 2010 There are two forms of the beta-sheet, depending upon how the strands are oriented with respect to one another Friday, August 20, 2010 Friday, August 20, 2010 In proteins containing beta-sheets, there are typically between 2-15 strands in a single sheet structure. These sheet structures in proteins are invariably twisted in a right-handed direction when viewed along the plane of the sheet due to the interactions between side chains, which are spaced 7 apart from one another on each side....
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8b - Lecture 8B: More on the secondary structure of...

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