Г. β-Петля

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В тех участках, где пептидная цепь изгибается достаточно круто, часто находится β-петля. Это короткий фрагмент, в котором 4 аминокислотных остатка расположены таким образом, что цепь делает реверсивный поворот (на 180°). Оба приведённых на схеме варианта петли (типы I и II) встречаются довольно часто. Обе структуры стабилизированы водородным мостиком между 1 и 4 остатками.


Биомолекулы. Пептиды и белки / Вторичные структуры белков

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