Reaction participants Show >> << Hide
- Name help_outline a globoside NORint Identifier CHEBI:140616 Charge 0 Formula C44H73N3O33R2 SMILEShelp_outline [C@H]([C@@H](*)O)(NC(=O)*)CO[C@@H]1O[C@@H]([C@@H](O[C@@H]2O[C@@H]([C@H](O[C@@H]3[C@@H]([C@@H](O[C@H]4[C@@H]([C@H]([C@@H](O[C@@H]5[C@@H]([C@@H](O[C@H]6[C@@H]([C@H]([C@@H](O)[C@H](O6)CO)O)NC(C)=O)[C@H]([C@@H](CO)O5)O)O)[C@H](O4)CO)O)NC(C)=O)[C@H]([C@@H](CO)O3)O)O)[C@@H]([C@H]2O)O)CO)[C@@H]([C@H]1O)O)CO 2D coordinates Mol file for the small molecule Search links Involved in 2 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
- Name help_outline UDP-α-D-galactose Identifier CHEBI:66914 Charge -2 Formula C15H22N2O17P2 InChIKeyhelp_outline HSCJRCZFDFQWRP-ABVWGUQPSA-L SMILEShelp_outline OC[C@H]1O[C@H](OP([O-])(=O)OP([O-])(=O)OC[C@H]2O[C@H]([C@H](O)[C@@H]2O)n2ccc(=O)[nH]c2=O)[C@H](O)[C@@H](O)[C@H]1O 2D coordinates Mol file for the small molecule Search links Involved in 151 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
- Name help_outline a globoside NOR2 Identifier CHEBI:140619 Charge 0 Formula C50H83N3O38R2 SMILEShelp_outline [C@H]([C@@H](*)O)(NC(=O)*)CO[C@@H]1O[C@@H]([C@@H](O[C@@H]2O[C@@H]([C@H](O[C@@H]3[C@@H]([C@@H](O[C@H]4[C@@H]([C@H]([C@@H](O[C@@H]5[C@@H]([C@@H](O[C@H]6[C@@H]([C@H]([C@@H](O)[C@H](O6)CO)O[C@@H]7[C@@H]([C@@H](O)[C@H]([C@@H](CO)O7)O)O)NC(C)=O)[C@H]([C@@H](CO)O5)O)O)[C@H](O4)CO)O)NC(C)=O)[C@H]([C@@H](CO)O3)O)O)[C@@H]([C@H]2O)O)CO)[C@@H]([C@H]1O)O)CO 2D coordinates Mol file for the small molecule Search links Involved in 2 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
- Name help_outline UDP Identifier CHEBI:58223 Charge -3 Formula C9H11N2O12P2 InChIKeyhelp_outline XCCTYIAWTASOJW-XVFCMESISA-K SMILEShelp_outline O[C@@H]1[C@@H](COP([O-])(=O)OP([O-])([O-])=O)O[C@H]([C@@H]1O)n1ccc(=O)[nH]c1=O 2D coordinates Mol file for the small molecule Search links Involved in 711 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
- Name help_outline H+ Identifier CHEBI:15378 Charge 1 Formula H InChIKeyhelp_outline GPRLSGONYQIRFK-UHFFFAOYSA-N SMILEShelp_outline [H+] 2D coordinates Mol file for the small molecule Search links Involved in 10,232 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
Cross-references
| RHEA:43588 | RHEA:43589 | RHEA:43590 | RHEA:43591 | |
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| Reaction direction help_outline | undefined | left-to-right | right-to-left | bidirectional |
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Related reactions help_outline
Specific form(s) of this reaction
Publications
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Evaluation of an amino acid residue critical for the specificity and activity of human Gb3/CD77 synthase.
Kaczmarek R., Mikolajewicz K., Szymczak K., Duk M., Majorczyk E., Krop-Watorek A., Buczkowska A., Czerwinski M.
Human Gb3/CD77 synthase (α1,4-galactosyltransferase) is the only known glycosyltransferase that changes acceptor specificity because of a point mutation. The enzyme, encoded by A4GALT locus, is responsible for biosynthesis of Gal(α1-4)Gal moiety in Gb3 (CD77, P<sup>k</sup> antigen) and P1 glycosph ... >> More
Human Gb3/CD77 synthase (α1,4-galactosyltransferase) is the only known glycosyltransferase that changes acceptor specificity because of a point mutation. The enzyme, encoded by A4GALT locus, is responsible for biosynthesis of Gal(α1-4)Gal moiety in Gb3 (CD77, P<sup>k</sup> antigen) and P1 glycosphingolipids. We showed before that a single nucleotide substitution c.631C > G in the open reading frame of A4GALT, resulting in replacement of glutamine with glutamic acid at position 211 (substitution p. Q211E), broadens the enzyme acceptor specificity, so it can not only attach galactose to another galactose but also to N-acetylgalactosamine. The latter reaction leads to synthesis of NOR antigens, which are glycosphingolipids with terminal Gal(α1-4)GalNAc sequence, never before described in mammals. Because of the apparent importance of position 211 for enzyme activity, we stably transfected the 2102Ep cells with vectors encoding Gb3/CD77 synthase with glutamine substituted by aspartic acid or asparagine, and evaluated the cells by quantitative flow cytometry, high-performance thin-layer chromatography and real-time PCR. We found that cells transfected with vectors encoding Gb3/CD77 synthase with substitutions p. Q211D or p. Q211N did not express P<sup>k</sup>, P1 and NOR antigens, suggesting complete loss of enzymatic activity. Thus, amino acid residue at position 211 of Gb3/CD77 synthase is critical for specificity and activity of the enzyme involved in formation of P<sup>k</sup>, P1 and NOR antigens. Altogether, this approach affords a new insight into the mechanism of action of the human Gb3/CD77 synthase. << Less
Glycoconj J 33:963-973(2016) [PubMed] [EuropePMC]
This publication is cited by 2 other entries.