TY - JOUR
T1 - Structures of the sugar chains of mouse immunoglobulin G
AU - Mizuochi, Tsuguo
AU - Hamako, Jiharu
AU - Titani, Koiti
N1 - Funding Information:
‘This work was supported in part by Grants-in-Aid for Scientific Research from the Ministry of Education, Science and Culture of Japan and by a Grant-in-Aid from Fujita-Gakuen Health University. ‘To whom correspondence should be addressed. ’ Abbreviations used: IgG, immunoglobulin ADCC, antibody-dependent cellular cytotoxicity; sodium dodecyl sulfate; GlcNAc, A’-acetylglucosamine; PBS, phosphate-buffered saline.
PY - 1987/9
Y1 - 1987/9
N2 - The asparagine-linked sugar chains of mouse immunoglobulin G (IgG) were quantitatively liberated as radioactive oligosaccharides from the polypeptide portions by hydrazinolysis followed by N-acetylation, and NaB3H4 reduction. After fractionation by paper electrophoresis, lectin (RCA120) affinity high-performance liquid chromatography, and gel filtration, their structures were studied by sequential exoglycosidase digestion in combination with methylation analysis. Mouse IgG was shown to contain the biantennary complex type sugar chains. Eight neutral oligosaccharide structures, viz, ±Galβ1 → 4GlcNAcβ1 → 2Manα1 → 6(±Galβ1 → 4GlcNAcβ1 → 2Manα1 → 3)Manβ1 → 4GlcNAcβ1 → 4(±Fucα1 → 6)GlcNAc, were found after the sialidase treatment. The molar ratio of the sugar chains with 2, 1, and 0 galactose residues was 2:5:3. The galactose residue in the monogalactosylated sugar chains was distributed on Manα1 → 3 and Manα1 → 6 sides in the ratio of 1:3. The oligosaccharides were almost wholly fucosylated and contained no bisecting N-acetylglucosamine which is present in human, rabbit, and bovine IgGS.
AB - The asparagine-linked sugar chains of mouse immunoglobulin G (IgG) were quantitatively liberated as radioactive oligosaccharides from the polypeptide portions by hydrazinolysis followed by N-acetylation, and NaB3H4 reduction. After fractionation by paper electrophoresis, lectin (RCA120) affinity high-performance liquid chromatography, and gel filtration, their structures were studied by sequential exoglycosidase digestion in combination with methylation analysis. Mouse IgG was shown to contain the biantennary complex type sugar chains. Eight neutral oligosaccharide structures, viz, ±Galβ1 → 4GlcNAcβ1 → 2Manα1 → 6(±Galβ1 → 4GlcNAcβ1 → 2Manα1 → 3)Manβ1 → 4GlcNAcβ1 → 4(±Fucα1 → 6)GlcNAc, were found after the sialidase treatment. The molar ratio of the sugar chains with 2, 1, and 0 galactose residues was 2:5:3. The galactose residue in the monogalactosylated sugar chains was distributed on Manα1 → 3 and Manα1 → 6 sides in the ratio of 1:3. The oligosaccharides were almost wholly fucosylated and contained no bisecting N-acetylglucosamine which is present in human, rabbit, and bovine IgGS.
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U2 - 10.1016/0003-9861(87)90581-9
DO - 10.1016/0003-9861(87)90581-9
M3 - Article
C2 - 3662531
AN - SCOPUS:0023414234
SN - 0003-9861
VL - 257
SP - 387
EP - 394
JO - Archives of Biochemistry and Biophysics
JF - Archives of Biochemistry and Biophysics
IS - 2
ER -