Control of O-glycan branch formation -: Molecular cloning of human cDNA encoding a novel β1,6-N-acetylglucosaminyltransferase forming core 2 and core 4

被引:81
作者
Schwientek, T
Nomoto, M
Levery, SB
Merkx, G
van Kessel, AG
Bennett, EP
Hollingsworth, MA
Clausen, H
机构
[1] Univ Copenhagen, Sch Dent, DK-2200 Copenhagen N, Denmark
[2] Univ Nebraska, Med Ctr, Eppley Inst Res Canc & Allied Dis, Omaha, NE 68198 USA
[3] Univ Georgia, Complex Carbohydrate Res Ctr, Athens, GA 30602 USA
[4] Univ Nijmegen Hosp, Dept Human Genet, NL-6500 HB Nijmegen, Netherlands
关键词
D O I
10.1074/jbc.274.8.4504
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
A novel human UDP-GlcNAc: Gal/GlcNAc beta 1-3GalNAc alpha beta 1,6GlcNAc-transferase, designated C2/4GnT, was identified by BLAST analysis of expressed sequence tags. The sequence of C2/4GnT encoded a putative type II transmembrane protein with significant sequence similarity to human C2GnT and IGnT, Expression of the secreted form of C2/4GnT in insect cells showed that the gene product had UDP-N-acetyl-alpha-D-glucosamine: acceptor beta 1,6-N-acetylglucosaminyltransferase (beta 1,6GlcNAc-transferase) activity. Analysis of substrate specificity revealed that the enzyme catalyzed O-glycan branch formation of the core 2 and core 4 type. NMR analyses of the product formed with core 3-para-nitrophenyl confirmed the product core 4-para-nitrophenyl, The coding region of C2/4GnT was contained in a single exon and located to chromosome 15q21.3. Northern analysis revealed a restricted expression pattern of C2/4GnT mainly in colon, kidney, pancreas, and small intestine. No expression of C2/4GnT was detected in brain, heart, liver, ovary, placenta, spleen, thymus, and peripheral blood leukocytes, The expression of core 2 O-glycans has been correlated with cell differentiation processes and cancer. The results confirm the predicted existence of a beta 1,6GlcNAc-transferase that functions in both core 2 and core 4 O-glycan branch formation. The redundancy in beta 1,6Glc-NAc-transferases capable of forming core 2 O-glycans is important for understanding the mechanisms leading to specific changes in core 2 branching during cell development and malignant transformation.
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页码:4504 / 4512
页数:9
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