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- W2004691211 abstract "The major feature of many proteins is a large β-sheet that twists and coils to form a closed structure in which the first strand is hydrogen bonded to the last: the β-sheet barrel. McLachlan classified barrels in terms of two integral parameters: the number of strands in the β-sheet, n, and the “shear number”, S, a measure of the stagger of the strands in the β-sheet. He showed that the mean radius of a barrel and the extent to which strands are tilted relative to its axis are determined by the values of n and S. Here we show that the (n, S) values determine all the other general structural features of regular β-sheet barrels, in particular, optimal values of the twist and coiling angles that produce the closed β-sheet, the hyperboloidal shape and the arrangement of residues in the barrel interior. Consideration of the residue arrangements in the interiors of different potential barrel structures, and of side-chain volumes, suggest that barrels, in which the interiors are close packed by the residues in β-sheets with good geometries, have structures that correspond to one of only ten different combinations of n and S. In the accompanying paper, we demonstrate, by an analysis of all observed protein structures that contain β-sheet barrels and for which atomic co-ordinates are available, the validity of these theoretical results." @default.
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- W2004691211 date "1994-03-01" @default.
- W2004691211 modified "2023-10-11" @default.
- W2004691211 title "Principles determining the structure of β-sheet barrels in proteins I. A theoretical analysis" @default.
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- W2004691211 doi "https://doi.org/10.1016/0022-2836(94)90064-7" @default.
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