羧基端由多个氨基酸残基按一定顺序所组成的多肽链，通常在一端含有一个游离的α氨基，称为氨基端或N末A端或N端，另一端含有一个游离的α羧基，称为羧基端或CA末端或C端。

应用

肽的命名是根据参与其组成的氨基酸残基来确定的，规定从肽链的氨基末端氨基酸残基开始，称为某氨酰某氨基酸等.例如，具有下列化学结构的五肽，命名为丝氨酰甘氨酰酪氨酰丙氨酰亮氨酸.SerGlyTyrAlaLeu。通常A总是把氨基末端氨基酸残基放在左边，羧基末端氨基酸残基放在右边，特别指出者除外.上边举例的五肽，如果反过来书写，把亮氨酸写在左边，而把丝氨酸写在最右边，就变成另一个不同的五肽LeuAlaTyrGlySer。AAAA相 关 词 条:细胞外基质|芋螺毒素 |氨基酸 |分子进化|By a number of amino acid residues composed of a certain sequence of polypeptide chain, usually at one end containing a free α-amino-acid called N-terminal or N terminal or N terminal end of A and the other end containing a free α-carboxyl group, saying for the carboxy-terminal end or C terminal, or CA. peptide involved in its name is based on the composition of amino acid residues to determine, the provisions of peptide chain from the N-terminal amino acid residues starting, called an aminoacyl certain amino acids, etc.. For example, with the following chemical structure of the 5 peptides, named seryl glycyl tyrosyl alanyl-leucine. SerGlyTyrAlaLeu. A usually always N-terminal amino acid residues on the left, carboxyl-terminal amino acid residues on the right side, in particular, pointed out that those other countries. Above example, the five peptides, if in turn, writing, written on the left side of the leucine and the serine written on the far right, it becomes a different five-peptide LeuAlaTyrGlySer. AAAA Related entries: extracellular matrix | Conotoxin | AminoAcid| molecular evolution |