Pauling and Corey proposed in 1953 that equimolar mixtures of all‐L and all‐D peptides may form two‐dimensional arrays with alternating chirality sense, termed rippled β‐sheets, in contrast with pleated β‐sheets formed by enantiopure (all‐L OR all‐D) peptides. Numerous enantiopure Aβ structures have been reported, providing beautiful examples of pleated cross‐β structures. Although indirect evidence exists, rippled cross‐β structures are yet to be reported. Dutta et al. use NMR spectroscopy to probe the differential aggregation of enantiomerically pure and racemic Aβ40 systems; might racemic Aβ yield the first rippled cross‐β structure? (doi: 10.1002/pep2.24139)

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鲍林（Pau​​ling）和科里（Corey）在1953年提出，全L和全D肽的等摩尔混合物可以形成具有交替手性意义的二维阵列，称为波纹β片，与对映纯形成的褶皱β片形成对比（全L OR all-D）肽。已经报道了许多对映纯Aβ结构，提供了优美的交叉β结构示例。尽管存在间接证据，但尚未报道波纹状的交叉β结构。杜塔等。使用NMR光谱探测对映体纯和外消旋Aβ40系统的差异聚集；外消旋Aβ会产生第一个波纹状的交叉β结构吗？（doi：10.1002 / pep2.24139）