Rhea - reaction knowledgebase

Enzymes

UniProtKB ^help_outline	2,365 proteins
Enzyme class ^help_outline	EC 2.4.3.3 alpha-N-acetylgalactosaminide alpha-2,6-sialyltransferase
GO Molecular Function ^help_outline	GO:0001665 alpha-N-acetylgalactosaminide alpha-2,6-sialyltransferase activity

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Name ^help_outline a β-D-galactosyl-(1→3)-N-acetyl-α-D-galactosaminyl derivative Identifier CHEBI:133470 Charge 0 Formula C14H24NO11R SMILES^help_outline [C@H]1([C@@H]([C@H]([C@H]([C@H](O1)CO)O)O[C@H]2[C@@H]([C@H]([C@H]([C@H](O2)CO)O)O)O)NC(=O)C)O* 2D coordinates Mol file for the small molecule Search links Involved in 4 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
Name ^help_outline CMP-N-acetyl-β-neuraminate Identifier CHEBI:57812 (Beilstein: 5899715) ^help_outline Charge -2 Formula C20H29N4O16P InChIKey^help_outline TXCIAUNLDRJGJZ-BILDWYJOSA-L SMILES^help_outline [H][C@]1(O[C@](C[C@H](O)[C@H]1NC(C)=O)(OP([O-])(=O)OC[C@H]1O[C@H]([C@H](O)[C@@H]1O)n1ccc(N)nc1=O)C([O-])=O)[C@H](O)[C@H](O)CO 2D coordinates Mol file for the small molecule Search links Involved in 81 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
Name ^help_outline a β-D-galactosyl-(1→3)-[N-acetyl-α-neuraminyl-(2→6)]-N-acetyl-α-D-galactosaminyl derivative Identifier CHEBI:140764 Charge -1 Formula C25H40N2O19R SMILES^help_outline [C@@H]1([C@H](O[C@@H]([C@@H]([C@@H]1O[C@H]2[C@@H]([C@H]([C@H]([C@H](O2)CO)O)O)O)O)CO[C@@]3(C[C@@H]([C@H]([C@](O3)([H])[C@@H]([C@@H](CO)O)O)NC(=O)C)O)C([O-])=O)O*)NC(=O)C 2D coordinates Mol file for the small molecule Search links Involved in 1 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
Name ^help_outline CMP Identifier CHEBI:60377 Charge -2 Formula C9H12N3O8P InChIKey^help_outline IERHLVCPSMICTF-XVFCMESISA-L SMILES^help_outline Nc1ccn([C@@H]2O[C@H](COP([O-])([O-])=O)[C@@H](O)[C@H]2O)c(=O)n1 2D coordinates Mol file for the small molecule Search links Involved in 164 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 InChIKey^help_outline GPRLSGONYQIRFK-UHFFFAOYSA-N SMILES^help_outline [H+] 2D coordinates Mol file for the small molecule Search links Involved in 9,431 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule

Cross-references

	RHEA:11136	RHEA:11137	RHEA:11138	RHEA:11139
Reaction direction	undefined	left-to-right	right-to-left	bidirectional
UniProtKB ^help_outline	2,365 proteins	2,365 proteins
EC numbers ^help_outline	2.4.3.3
Gene Ontology ^help_outline	GO:0001665
MetaCyc ^help_outline		RXN-15270

Publications

Molecular cloning and functional expression of human ST6GalNAc II. Molecular expression in various human cultured cells.

Samyn-Petit B., Krzewinski-Recchi M.A., Steelant W.F.A., Delannoy P., Harduin-Lepers A.

A cDNA clone encoding a human Galbeta1-3GalNAc alpha2, 6-sialyltransferase (designated hST6GalNAc II) was identified employing the PCR with degenerated primers to the sialylmotifs, followed by BLAST analysis of databanks. This sialyltransferase sequence is similar to that of previously cloned ST6G ... >> More

A cDNA clone encoding a human Galbeta1-3GalNAc alpha2, 6-sialyltransferase (designated hST6GalNAc II) was identified employing the PCR with degenerated primers to the sialylmotifs, followed by BLAST analysis of databanks. This sialyltransferase sequence is similar to that of previously cloned ST6GalNAc II (chicken and mouse) and shows the sialylmotifs that are present in all eukaryotic members of the sialyltransferase gene family. The predicted amino acid sequence encodes a putative type II transmembrane protein as found for other eukaryotic sialyltransferases and shows significant similarity to chicken (56. 8% identity) and mouse (74.6% identity) enzymes. Expression of a secreted form of hST6GalNAc II in COS-7 cells showed that the gene product had Galbeta1-3GalNAc (sialyl to GalNAc) alpha2, 6-sialyltransferase activity. In vitro analysis of substrate specificity revealed that the enzyme required a peptide aglycone fraction to be active and used both Galbeta1-3GalNAc and Neu5Acalpha2-3Galbeta1-3GalNAc as acceptor substrates. Northern analysis revealed a restricted expression pattern of two hST6GalNAc II transcripts, a 2.0 kb mRNA found mainly in skeletal muscle, heart and kidney and a 1.8 kb mRNA found in placenta, lung and leukocytes. No transcriptional expression was detected in brain, thymus or spleen. Transcriptional expression of the ST6GalNAc II gene was followed in various human cell lines and found to be expressed in almost all cell types with notable exceptions for several myeloid and lymphoid cell lines. << Less

Biochim. Biophys. Acta 1474:201-211(2000) [PubMed] [EuropePMC]
Molecular cloning and genomic analysis of mouse Galbeta1, 3GalNAc-specific GalNAc alpha2,6-sialyltransferase.

Kurosawa N., Inoue M., Yoshida Y., Tsuji S.

cDNA and genomic clones encoding mouse Galbeta1, 3GalNAc-specific GalNAc alpha2,6-sialyltransferase (ST6GalNAc II) were isolated, and the structure organization of the gene was determined. The predicted amino acid sequence is 57.4% identical to the chick ST6GalNAc II sequence but 33.8% identical t ... >> More

cDNA and genomic clones encoding mouse Galbeta1, 3GalNAc-specific GalNAc alpha2,6-sialyltransferase (ST6GalNAc II) were isolated, and the structure organization of the gene was determined. The predicted amino acid sequence is 57.4% identical to the chick ST6GalNAc II sequence but 33.8% identical to the chick ST6GalNA I (GalNAc alpha2, 6-sialyltransferase) sequence. The ST6GalNAc II gene is constitutively expressed in various mouse tissues but highly expressed in lactating mammary gland and adult testis. The gene contains nine exons spanning about 25 kilobases of genomic DNA and encodes a messenger RNA of 1995 nucleotides. Primer extension and S1 nuclease protection analysis of submaxillary gland mRNA showed that the transcription of the ST6GalNAc II gene starts from 68 nucleotides upstream from the translation start site. Characterization of 5'-flanking genomic regions indicated that the Galbeta1,3GalNAc-specific GalNAc alpha2,6-sialyltransferase promoter is embedded in a G+C-rich domain and contains no TATA or CAAT box but has putative binding sites for transcription factors Sp1 and AP-2. Transient transfection experiments involving luciferase reporter genes demonstrated promoter activity in NIH3T3 cells. << Less

J. Biol. Chem. 271:15109-15116(1996) [PubMed] [EuropePMC]
Expression system for structural and functional studies of human glycosylation enzymes.

Moremen K.W., Ramiah A., Stuart M., Steel J., Meng L., Forouhar F., Moniz H.A., Gahlay G., Gao Z., Chapla D., Wang S., Yang J.Y., Prabhakar P.K., Johnson R., Rosa M.D., Geisler C., Nairn A.V., Seetharaman J., Wu S.C., Tong L., Gilbert H.J., LaBaer J., Jarvis D.L.

Vertebrate glycoproteins and glycolipids are synthesized in complex biosynthetic pathways localized predominantly within membrane compartments of the secretory pathway. The enzymes that catalyze these reactions are exquisitely specific, yet few have been extensively characterized because of challe ... >> More

Vertebrate glycoproteins and glycolipids are synthesized in complex biosynthetic pathways localized predominantly within membrane compartments of the secretory pathway. The enzymes that catalyze these reactions are exquisitely specific, yet few have been extensively characterized because of challenges associated with their recombinant expression as functional products. We used a modular approach to create an expression vector library encoding all known human glycosyltransferases, glycoside hydrolases, and sulfotransferases, as well as other glycan-modifying enzymes. We then expressed the enzymes as secreted catalytic domain fusion proteins in mammalian and insect cell hosts, purified and characterized a subset of the enzymes, and determined the structure of one enzyme, the sialyltransferase ST6GalNAcII. Many enzymes were produced at high yields and at similar levels in both hosts, but individual protein expression levels varied widely. This expression vector library will be a transformative resource for recombinant enzyme production, broadly enabling structure-function studies and expanding applications of these enzymes in glycochemistry and glycobiology. << Less

Nat. Chem. Biol. 14:156-162(2018) [PubMed] [EuropePMC]
Purification to homogeneity and enzymatic characterization of an alpha-N-acetylgalactosaminide alpha 2 leads to 6 sialyltransferase from porcine submaxillary glands.

Sadler J.E., Rearick J.I., Hill R.L.

By means of affinity chromatography on CDP-hexanolamine-agarose, a CMP-N-acetylneuraminate: alpha-N-acetylgalactosaminide alpha 2 leads to 6 sialyltransferase (EC 2.4.99.1) has been purified 117,000-fold to homogeneity from Triton X-100 extracts of porcine submaxillary glands. The enzyme consists ... >> More

By means of affinity chromatography on CDP-hexanolamine-agarose, a CMP-N-acetylneuraminate: alpha-N-acetylgalactosaminide alpha 2 leads to 6 sialyltransferase (EC 2.4.99.1) has been purified 117,000-fold to homogeneity from Triton X-100 extracts of porcine submaxillary glands. The enzyme consists of several electrophoretic forms that can be partially resolved by chromatography on Sephadex G-200, the largest of which has a molecular weight of approximately 160,000 as estimated by sodium dodecyl sulfate-gel electrophoresis. Periodate oxidation studies show that the linkage formed by this enzyme with ovine submaxillary asialo-mucin as the acceptor substrate is NeuAc alpha 2 leads to 6GalNAc alpha 1 leads to O-Thr/Ser. On the basis of initial rate studies and the patterns of inhibition observed with alternate acceptor substrates, the transferase is proposed to have either a random equilibrium kinetic mechanism or an ordered steady state mechanism with the acceptor substrate binding first. Among a wide variety of oligosaccharides, glycoproteins, and simple glycosides (including p-nitrophenyl-alpha-N-acetylgalactosaminide), the only acceptor substrates for this enzyme are those glycoproteins containing the structure, R leads to 3GalNAc alpha 1 leads to O-Thr/Ser, where R may be H or a beta-galactoside. << Less

J Biol Chem 254:5934-5941(1979) [PubMed] [EuropePMC]

RHEA:11136 a beta-D-galactosyl-(1->3)-N-acetyl-alpha-D-galactosaminyl derivative + CMP-N-acetyl-beta-neuraminate = a beta-D-galactosyl-(1->3)-[N-acetyl-alpha-neuraminyl-(2->6)]-N-acetyl-alpha-D-galactosaminyl derivative + CMP + H(+)

Enzymes

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Cross-references

Publications

Molecular cloning and functional expression of human ST6GalNAc II. Molecular expression in various human cultured cells.

Molecular cloning and genomic analysis of mouse Galbeta1, 3GalNAc-specific GalNAc alpha2,6-sialyltransferase.

Expression system for structural and functional studies of human glycosylation enzymes.

Purification to homogeneity and enzymatic characterization of an alpha-N-acetylgalactosaminide alpha 2 leads to 6 sialyltransferase from porcine submaxillary glands.