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. 1971 Aug;123(5):739–745. doi: 10.1042/bj1230739

The oligosaccharide units of a human type L immunoglobulin M (macroglobulin)

I Johnson 1, J R Clamp 1
PMCID: PMC1177075  PMID: 5124383

Abstract

1. The carbohydrate composition of the monomeric unit of a type L macroglobulin (immunoglobulin M) was determined as 6 residues of fucose, 35 of mannose, 11 of galactose, 27 of N-acetylglucosamine and 9 of sialic acid. 2. Two types of oligosaccharide unit were present in the protein, one of which (Ca type) contained fucose, mannose, galactose, N-acetylglucosamine and sialic acid in the molar proportions 1:3–4:2:3–5:0–2, and the other (Cb type) contained mannose and N-acetylglucosamine in the proportions 6–8:2–3. 3. A tentative structure is proposed for the Cb type unit. 4. An S-carboxymethylcysteine-containing glycopeptide with a Ca-type unit was isolated after reduction, alkylation and tryptic digestion of the protein. 5. The immunoglobulin monomer appears to contain six oligosaccharide units of the Ca type and two of the Cb type.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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