不少中学生物学教师对β-折叠划为蛋白质二级结构提出疑问,疑问的主要点是:蛋白质的二级结构是指一条多肽链的折叠盘绕方式,而β-折叠(不论是平行的或是反平行的)都是两条以上肽链折叠盘绕而成,一条与两条以上显然是不相等的。而所有研究蛋白质的论著都毫无置疑地把β-折叠列为二级结构,这应该怎样理解呢?本文试浅析如下: 二级结构的概念和特征蛋白质的分子量很大(约六千到一百万之间)。结构十分复杂。为了研究的方便,1952年Linderstrφm—Lang首先将蛋白质的结构划 Many secondary school biology teachers questioned the structure of β-sheets as protein secondary structures. The main points of doubt are: the secondary structure of proteins refers to the folding coiling of a polypeptide chain, and the β-sheet (whether parallel or It is anti-parallel) that two or more peptide chains are coiled and coiled, one and two or more of which are obviously not equal. All the research on protein is unquestionably classifying β-sheets as secondary structures. How should this be understood? This article looks at the following: The concept and characteristics of secondary structures The molecular weight of proteins is very large (about 6,000 to One million.) The structure is very complicated. For the convenience of the study, Linderstrφm-Lang first mapped the structure of the protein in 1952.