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.
复制标题
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
中科院分区:
文献类型:
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作者:
J. Baenziger;S. Kornfeld;S. Kochwa
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.