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Different asparagine linked sugar chains on the 2 poly peptide chains of human chorionic gonadotropin






Biochemical & Biophysical Research Communications 97(2): 772-778

Different asparagine linked sugar chains on the 2 poly peptide chains of human chorionic gonadotropin

Human chorionic gonadotropin (hCG) purified from placenta, like urinary hCG, has the sialylated forms of 3 neutral oligosaccharides: Gal.beta.1 .fwdarw. 4GlcNAc.beta.1 .fwdarw. 2Man.alpha.1 .fwdarw. 6 (Gal.beta.1 .fwdarw. 4GlcNAc.beta.1 .fwdarw. 2 Man.alpha.1 .fwdarw. 3) Man.beta.1 .fwdarw. 4GlcNAc.beta.1 .fwdarw. 4 (Fuc.alpha.1 .fwdarw. 6) GlcNAc (N-1), Gal.beta.1 .fwdarw. 4GlcNAc.beta.1 .fwdarw. 2Man.alpha.1 .fwdarw. 6 (Gal.beta.1 .fwdarw. 4GlcNAc.beta.1 .fwdarw. 2Man.alpha.1 .fwdarw. 3) Man.beta.1 .fwdarw. 4GlcNAc.beta.1 .fwdarw. 4GlcNAc (N-2) and Man.alpha.1 .fwdarw. 6 (Gal.beta.1 .fwdarw. 4GlcNAc.beta.1 .fwdarw. 2Man.alpha.1 .fwdarw. 3) Man.beta.1 .fwdarw. 4 GlcNAc.beta.1 .fwdarw. 4GlcNAc (N-3). Gel permeation chromatographic analysis of oligosaccharides released from .alpha.- and .beta.-subunits of placental hCG revealed that the .alpha.-subunit has 1 each of sialylated N-2 and N-3, while the .beta.-subunit has 1 each of sialylated N-1 and N -2.

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Accession: 005151885



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