Immunoassay of glycosylated proteins employing antibody directed

Chemistry: analytical and immunological testing – Involving production or treatment of antibody – Monoclonal antibody

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435 71, 435 79, 435 14, 43524027, 435 7021, 436536, 5303875, 5303879, 53038825, 5303893, G01N 3353, G01N 33542

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active

054847354

ABSTRACT:
An immunoassay for a protein that is non-enzymatically glycosylated on the alpha amino group of its N-terminal amino acid, the immunoassay comprising: providing a sample containing the glycosylated protein; reacting the glycosylated protein with a reducing agent so that the sugar residue on the N-terminal amino acid is reduced; contacting the reduced glycosylated protein with an antibody directed to Glc-ol-X which is prepared by immunizing an animal with an immunogen of the formula (Glc-ol-X-L).sub.n -carrier; and detecting or quantitating the reduced glycosylated protein bound to the antibody. In the formula (Glc-ol-X-L).sub.n -carrier: X is the N-terminal amino acid of the glycosylated protein, except that X cannot be lysine; L is a bond or a linker group; Glc-ol is the reduced form of the sugar attached to X on the glycosylated protein, and Glc-ol is attached to the alpha amino group of X; the carrier is an immunogenic compound other than the glycosylated protein; and n is from 1 to the number of available coupling sites on the carrier. Also, the antibody, the immunogen, and methods of making them. Finally, a kit for quantitating a protein glycosylated on its N-terminal amino acid.

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