Structure of the carbohydrate units of IgE immunoglobulin. II. Sequence of the sialic acid-containing glycopeptides.

Structure of the carbohydrate units of IgE immunoglobulin. II. Sequence of the sialic acid-containing glycopeptides.
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IgE 免疫球蛋白碳水化合物单位的结构。

DOI:
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发表时间:
1974
影响因子:
4.8
通讯作者:
S. Kochwa
S. Kochwa
中科院分区:
生物学2区
文献类型:
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作者:
J. Baenziger;S. Kornfeld;S. Kochwa

文献摘要

被引文献

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摘要:在之前的论文(Baenziger, J.、Kornfeld, S. 和 Kochwa, S. (1974) J. Biol. Chem. 249, 1889)中表明,IgE 骨髓瘤蛋白每条重链有 4 个寡糖单元,其中 1 个仅包含甘露糖和 N-乙酰氨基葡萄糖,而其他 3 个包含唾液酸、岩藻糖、半乳糖、甘露糖和N-乙酰氨基葡萄糖的比例为1至2:1:2:3:4。本文中的数据建立了三种含唾液酸糖肽的结构,分别命名为 B-1、B-2 和 B-3。糖肽B-2和B-3是含有两个非还原末端的分支结构,其序列为唾液酸(α2,6)/→Gal(β1,4)/→GlcNAc(β1,2)/→Man(α)/→,而B-1具有一个具有上述结构的非还原末端,另一个具有序列Gal(β1,4)/→GlcNAc(β1,2)/→Man(α)/→。所有三种 B-糖肽的核心都是相同的,并具有以下序列: [序列请参见 PDF] 以唾液酸终止的 B-1 分支源自核心中 β-连接甘露糖的位置 3,而以半乳糖终止的分支源自该甘露糖的位置 6。
Abstract In the preceding paper (Baenziger, J., Kornfeld, S., and Kochwa, S. (1974) J. Biol. Chem. 249, 1889) it was shown that an IgE myeloma protein has 4 oligosaccharide units per heavy chain, 1 of which contains only mannose and N-acetylglucosamine while the other 3 contain sialic acid, fucose, galactose, mannose, and N-acetylglucosamine in the ratio of 1 to 2:1:2:3:4. The data in this paper establish the structure of the three sialic acid-containing glycopeptides, designated B-1, B-2, and B-3. Glycopeptides B-2 and B-3 are branched structures containing two nonreducing termini with the sequence sialic acid (α2,6)/→ Gal (β1,4)/→ GlcNAc (β1,2)/→ Man (α)/→, while B-1 has one nonreducing terminus with the above structure and another with the sequence Gal (β1,4)/→ GlcNAc (β1,2)/→ Man (α)/→. The core of all three B-glycopeptides is identical and has the sequence: [see PDF for sequence] The branch of B-1 terminating in sialic acid originates from position 3 of the β-linked mannose in the core while the branch terminating in galactose originates from position 6 of this mannose.