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J. Biol. Chem., Vol. 276, Issue 5, 3498-3507, February 2, 2001
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1,3-N-Acetylglucosaminyltransferases Structurally
Related to the
1,3-Galactosyltransferase Family*
§,
§,
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,
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,

From the We have isolated three types of cDNAs
encoding novel
Tokyo Research Laboratories, Kyowa Hakko
Kogyo Company, Limited, 3-6-6 Asahi-machi, Machida-shi, Tokyo 194-8533, the ¶ Division of Cell Biology, Institute of Life Science, Soka
University, 1-236 Tangi-cho, Hachioji, Tokyo 192-8577, the
Laboratory of Cancer Biology and Molecular Immunology, Graduate
School of Pharmaceutical Sciences, University of Tokyo, 7-3-1 Hongo,
Bunkyo-ku, Tokyo 113, and the ** Laboratory of Animal Resources, Faculty
of Bioindustry, Tokyo University of Agriculture, 196 Aza-Yasaka,
Abashiri-shi, Hokkaido 099-2422, Japan
1,3-N-acetylglucosaminyltransferases
(designated
3Gn-T2, -T3, and -T4) from human gastric mucosa and the
neuroblastoma cell line SK-N-MC. These enzymes are predicted to be type
2 transmembrane proteins of 397, 372, and 378 amino acids,
respectively. They share motifs conserved among members of the
1,3-galactosyltransferase family and a
1,3-N-acetylglucosaminyltransferase (designated
3Gn-T1), but show no structural similarity to another type of
1,3-N-acetylglucosaminyltransferase (iGnT). Each
of the enzymes expressed by insect cells as a secreted protein fused to
the FLAG peptide showed
1,3-N-acetylglucosaminyltransferase activity for type 2 oligosaccharides but not
1,3-galactosyltransferase activity. These
enzymes exhibited different substrate specificity. Transfection of
Namalwa KJM-1 cells with
3Gn-T2, -T3, or -T4 cDNA led to an
increase in poly-N-acetyllactosamines recognized by an
anti-i-antigen antibody or specific lectins. The expression profiles of
these
3Gn-Ts were different among 35 human tissues.
3Gn-T2 was
ubiquitously expressed, whereas expression of
3Gn-T3 and -T4 was
relatively restricted.
3Gn-T3 was expressed in colon, jejunum,
stomach, esophagus, placenta, and trachea.
3Gn-T4 was mainly
expressed in brain. These results have revealed that several
1,3-N-acetylglucosaminyltransferases form a family with
structural similarity to the
1,3-galactosyltransferase family.
Considering the differences in substrate specificity and distribution,
each
1,3-N-acetylglucosaminyltransferase may play
different roles.
The nucleotide sequences reported in this paper have been
submitted to the DDBJ/GenBankTM/EBI Data Bank
with accession numbers AB049584 (
3Gn-T2), AB049585 (
3Gn-T3), and AB049586 (
3Gn-T4).

To whom correspondence should be addressed. Tel.:
81-427-25-2555; Fax: 81-427-26-8330; E-mail:
ksasaki@kyowa.co.jp.
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