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ß4GalT6 is involved in the synthesis of lactosylceramide with less intensity than ß4GalT5.
Glycobiology ; 23(10): 1175-83, 2013 Oct.
Article em En | MEDLINE | ID: mdl-23882130
ABSTRACT
Glycosphingolipids are expressed on the cell membrane and act as important factors in various events that occur across the plasma membrane. Lactosylceramide (LacCer) is synthesized from glucosylceramide and is a common precursor of various glycosphingolipids existing in whole body. Based on the enzyme purification, ß1,4-galactosyltransferase 6 (B4galt6) cDNA was isolated as a LacCer synthase-coding gene in the rat brain. We generated B4galt6 gene knockout (KO) mice and analyzed their phenotypes to examine roles of ß4GalT6. B4galt6 KO mice were born and grew up apparently normal. LacCer synthase activity and the composition of acidic glycosphingolipids in the brain were almost equivalent or minimally different between wild-type and KO mice. Studies by mouse embryonic fibroblasts (MEFs) revealed that the silencing of B4galt5 gene resulted in the marked reduction in LacCer synthase activity and this reduction was more severe in MEFs derived from B4galt6 KO mice than those from wild-type mice. These results suggested that ß4GalT6 plays a role as a LacCer synthase, whereas ß4GalT5 acts as a main enzyme for LacCer biosynthesis in these tissues and cells.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Galactosiltransferases / Lactosilceramidas Limite: Animals Idioma: En Revista: Glycobiology Assunto da revista: BIOQUIMICA Ano de publicação: 2013 Tipo de documento: Article

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Galactosiltransferases / Lactosilceramidas Limite: Animals Idioma: En Revista: Glycobiology Assunto da revista: BIOQUIMICA Ano de publicação: 2013 Tipo de documento: Article