请描述二股、三股与四股的卷曲螺旋。
在自然界中何处可以发现这样的卷曲螺旋？
卷曲螺旋有何特性？
这种“卷曲螺旋”包装模式在生物学中常见，尤其是在信号蛋白中。
This "coiled coil" wrapping motif is common in biology, particularly in signaling proteins.
转化酸性卷曲螺旋蛋白(TACC)是一个蛋白家族，其特征是羧基末端共有的约200个氨基酸的卷曲螺旋模体(1)。
Transforming acid coiled-coil (TACC) proteins are a family of proteins characterized by a common coiled-coil motif of approximately 200 amino acids at the carboxy-terminal end (1).
转化酸性卷曲螺旋蛋白(TACC)是一个蛋白家族，其特征是羧基末端共有的约200个氨基酸的卷曲螺旋模体(1)。
Transforming acid coiled-coil (TACC) proteins are a family of proteins characterized by a common coiled-coil motif of approximately 200 amino acids at the carboxy-terminal end (1).
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