简述蛋白质的β折叠结构。
①多肽链充分伸展,各个肽平面之间折叠成锯齿状结构,侧链R基交错分布于锯齿状结构的上下方;②两条肤链或一条肤链的若干段平行排列,它们之间的羰基氧和亚氨基氢形成氢键;③相邻两条(或两段)肤链走向相同为平行β-折叠,走向相反为反平行β-折叠。
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