β1,3-Galactosyltransferase β3Gal-T5 Acts on the GlcNAcβ1→3Galβ1→4GlcNAcβ1→R Sugar Chains of Carcinoembryonic Antigen and Other N-Linked Glycoproteins and Is Down-regulated in Colon Adenocarcinomas*
β1,3-Galactosyltransferase β3Gal-T5 Acts on the GlcNAcβ1→3Galβ1→4GlcNAcβ1→R Sugar Chains of Carcinoembryonic Antigen and Other N-Linked Glycoproteins and Is Down-regulated in Colon Adenocarcinomas*
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β1,3-半乳糖基转移酶 β3Gal-T5 作用于癌胚抗原和其他 N 连接糖蛋白的 GlcNAcβ1→3Galβ1→4GlcNAcβ1→R 糖链,并在结肠腺癌中下调*
DOI:
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发表时间:
2001
影响因子:
4.8
通讯作者:
M. Trinchera
中科院分区:
文献类型:
--
作者:
R. Salvini;A. Bardoni;M. Valli;M. Trinchera
We attempted to determine whether β1,3-galactosyltransferase β3Gal-T5 is involved in the biosynthesis of a specific subset of type 1 chain carbohydrates and expressed in a cancer-associated manner. We transfected Chinese hamster ovary (CHO) cells expressing Fuc-TIII with β3Gal-T cDNAs and studied the relevant glycoconjugates formed. β3Gal-T5 directs synthesis of Lewis type 1 antigens in CHO cells more efficiently than β3Gal-T1, whereas β3Gal-T2, -T3, and -T4 are almost unable to direct synthesis. In the clone expressing Fuc-TIII and β3Gal-T5 (CHO-FT-T5), sialyl-Lewis a synthesis is strongly inhibited by swainsonine but not by benzyl-α-GalNAc, and sialyl-Lewis x is absent, although it is detected in the clones expressing Fuc-TIII and β3Gal-T1 (CHO-FT-T1) or Fuc-TIII and β3Gal-T2 (CHO-FT-T2). Endo-β-galactosidase treatment of N- glycans prepared from clone CHO-FT-T5 releases (±NeuAcα2→3)Galβ1→3[Fucα1→4]GlcNAcβ1→3Gal but not GlcNAcβ1→3Gal or type 2 chain oligosaccharides, which are found in CHO-FT-T1 cells. This result indicates that β3Gal-T5 expression prevents poly-N-acetyllactosamine and sialyl-Lewis x synthesis on N-glycans. Kinetic studies confirm that β3Gal-T5 prefers acceptors having the GlcNAcβ1→3Gal end, including lactotriosylceramide. Competitive reverse transcriptase mediated-polymerase chain reaction shows that the β3Gal-T5 transcript is expressed in normal colon mucosa but not or poorly in adenocarcinomas. Moreover, recombinant carcinoembryonic antigen purified from a CHO clone expressing Fuc-TIII and β3Gal-T5 reacts with anti-sialyl-Lewis a and carries type 1 chains on oligosaccharides released by endo-β-galactosidase. We conclude that β3Gal-T5 down-regulation plays a relevant role in determining the cancer-associated glycosylation pattern ofN-glycans.
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影响因子:
11.2
作者:
J. Magnani;Z. Steplewski;H. Koprowski;V. Ginsburg
通讯作者:
J. Magnani;Z. Steplewski;H. Koprowski;V. Ginsburg
影响因子:
3.9
作者:
Holmes,EH
通讯作者:
Holmes,EH
DOI:
--
发表时间:
1994
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
Bierhuizen,MF;Maemura,K;Fukuda,M
通讯作者:
Fukuda,M
DOI:
--
发表时间:
1994
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
Sueyoshi,S;Tsuboi,S;Sawada-Hirai,R;Dang,UN;Lowe,JB;Fukuda,M
通讯作者:
Fukuda,M
DOI:
--
发表时间:
1983
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
Sheares,BT;Carlson,DM
通讯作者:
Carlson,DM