Glycobiology, Vol 9, 303-310, Copyright © 1999 by Oxford University Press
A Yoshida, MT Minowa, S Takamatsu, T Hara, S Oguri, H Ikenaga and M Takeuchi
A human cDNA for UDP- N -acetylglucosamine:alpha1,3-d-mannoside beta1,4- N-
acetylglucosaminyltransferase (GnT-IV) was isolated from a liver cDNA
library using a probe based on a partial cDNA sequence of the bovine
GnT-IV. The cDNA encoded a complete sequence of a type II membrane protein
of 535 amino acids which is 96% identical to the bovine GnT-IV. Transient
expression of the human cDNA in COS7 cells increased total cellular GnT-IV
activity 25-fold, demonstrating that this cDNA encodes a functional human
GnT-IV. Northern blot analysis of normal tissues indicated that at least
five different sizes of mRNA (9.7, 7.6, 5.1, 3.8, and 2.4 kb) forGnT-IV are
expressed in vivo. Furthermore, these mRNAs are expressed at different
levels between tissues. Large amounts of mRNA were detected in tissues
harboring T lineage cells. Also, the promyelocytic leukemia cell line HL-60
and the lymphoblastic leukemia cell line MOLT-4 revealed abundant mRNA.
Lastly, the gene was mapped at the locus on human chromosome 2, band q12 by
fluorescent in situ hybridization.
ORIGINAL ARTICLES
Tissue specific expression and chromosomal mapping of a human UDP-N- acetylglucosamine: alpha1,3-d-mannoside beta1, 4-N- acetylglucosaminyltransferase
Glycotechnology Group, Central Laboratories for Key Technology, Kirin Brewery Co., Ltd., 1-13-5 Fukuura, Kanazawa-ku, Yokohama 236-0004, Japan.
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