Expression of the developmental I antigen by a cloned human cDNA

Drug – bio-affecting and body treating compositions – Enzyme or coenzyme containing – Transferases

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435193, 435 691, 435 701, 4353201, 4351723, 4352402, 536 232, C12N 910, C12N 1554, A61K 3845

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active

054845904

ABSTRACT:
The present invention provides an isolated nucleic acid molecule encoding both a soluble and membrane-bound human .beta.-1,6-N-acetylglucosaminyltransferase, the I-branching enzyme (IGnT). The invention also provides vectors containing the isolated nucleic acid molecule encoding human IGnT as well as recombinant host cells transformed with the vectors. The invention further provides a method of preparing a membrane-bound form of human IGnT and methods of preparing and purifying soluble human IGnT and active fragments of either form. Also provided are antisense oligonucleotides complementary to a nucleic acid molecule encoding a human IGnT or an active fragment thereof, antibodies directed to the human IGnT, pharmaceutical compositions related to the human IGnT and transgenic nonhuman mammals expressing DNA encoding normal or mutant human IGnT. Also provided are methods for regulating the expression of human IGnT and methods for modifying a biological function mediated by the regulatory activity of human IGnT. Methods of detecting the presence of linear polylactosaminoglycans expressing i antigenic determinants on a cell surface also are provided.

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