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• W2068903744 abstract "This communication asks whether homochiral or heterochiral interaction is preferred between enantiomeric beta-sheets and finds that homochiral pairing is strongly preferred. Interactions between beta-sheets occur widely among proteins through pairing of the hydrogen-bonding edges. Although the hydrogen-bonding edges of both l- and d-beta-sheets put forth the same pattern of hydrogen-bond donor and acceptor groups, the side chains point in opposite directions. Homochiral pairing of beta-sheets generates structures in which the pleats and side chains of adjacent beta-strands are parallel to each other, while heterochiral pairing of beta-sheets generates structures in which the pleats and side chains are antiparallel. To test which pairing is preferred, we have prepared and studied the interactions of beta-sheets 1a-d, which comprise all l-amino acids, and beta-sheets 2a-c, which comprise all d-amino acids. Previous studies in our laboratory have established that these compounds form well-defined dimers in organic solvents. In the current study, 1H NMR experiments establish that when the l-beta-sheets (1) are mixed with the enantiomeric d-beta-sheets (2), homochiral beta-sheet dimers predominate, and only small quantities of heterochiral beta-sheet dimers form. Ratios of homochiral and heterochiral dimers ranging from 95.8:4.2 to 98.5:1.5 are measured in CDCl3 at 253 K, which correspond to statistically corrected free-energy differences of 3.1-4.2 kcal/mol (0.6-0.8 kcal/mol per interacting residue). Possible explanations for the high enantioselectivity of molecular recognition between beta-sheets include favorable nonbonded contacts between the adjacent beta-strands of the homochiral beta-sheets and poor fit of the heterochiral beta-strands, which should twist in opposite directions." @default.
• W2068903744 created "2016-06-24" @default.
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• W2068903744 date "2004-02-21" @default.
• W2068903744 modified "2023-10-01" @default.
• W2068903744 title "Enantioselective Molecular Recognition between β-Sheets" @default.
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• W2068903744 doi "https://doi.org/10.1021/ja031632z" @default.
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