The Enzyme Database

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EC 2.4.1.62     
Accepted name: ganglioside galactosyltransferase
Reaction: UDP-α-D-galactose + an N-acetyl-β-D-galactosaminyl-(1→4)-[α-N-acetylneuraminyl-(2→3)]-β-D-galactosyl-(1→4)-β-D-glucosyl-(1↔1)-ceramide = UDP + a β-D-galactosyl-(1→3)-N-acetyl-β-D-galactosaminyl-(1→4)-[α-N-acetylneuraminyl-(2→3)]-β-D-galactosyl-(1→4)-β-D-glucosyl-(1↔1)-ceramide
For diagram of ganglioside biosynthesis, click here
Glossary: N-acetyl-β-D-galactosaminyl-(1→4)-[α-N-acetylneuraminyl-(2→3)]-β-D-galactosyl-(1→4)-β-D-glucosyl-(1↔1)-ceramide = ganglioside GM2
a β-D-galactosyl-(1→3)-N-acetyl-β-D-galactosaminyl-(1→4)-[α-N-acetylneuraminyl-(2→3)]-β-D-galactosyl-(1→4)-β-D-glucosyl-(1↔1)-ceramide = gangloside GM1a
Other name(s): UDP-galactose—ceramide galactosyltransferase; uridine diphosphogalactose-ceramide galactosyltransferase; UDP galactose-LAC Tet-ceramide α-galactosyltransferase; UDP-galactose-GM2 galactosyltransferase; uridine diphosphogalactose-GM2 galactosyltransferase; uridine diphosphate D-galactose:glycolipid galactosyltransferase; UDP-galactose:N-acetylgalactosaminyl-(N-acetylneuraminyl) galactosyl-glucosyl-ceramide galactosyltransferase; UDP-galactose-GM2 ganglioside galactosyltransferase; GM1-synthase; UDP-galactose:N-acetyl-D-galactosaminyl-(N-acetylneuraminyl)-D-galactosyl-D-glucosyl-N-acylsphingosine β-1,3-D-galactosyltransferase; UDP-galactose:N-acetyl-D-galactosaminyl-(N-acetylneuraminyl)-D-galactosyl-(1→4)-β-D-glucosyl-N-acylsphingosine 3-β-D-galactosyltransferase
Systematic name: UDP-α-D-galactose:N-acetyl-β-D-galactosaminyl-(1→4)-[α-N-acetylneuraminyl-(2→3)]-β-D-galactosyl-(1→4)-β-D-glucosyl-(1↔1)-ceramide 3-β-D-galactosyltransferase
Comments: The substrate is also known as gangloside GM2, the product as gangloside GM1a
Links to other databases: BRENDA, EXPASY, KEGG, MetaCyc, CAS registry number: 37217-28-0
References:
1.  Basu, S., Kaufman, B. and Roseman, S. Conversion of Tay-Sachs ganglioside to monosialoganglioside by brain uridine diphosphate D-galactose: glycolipid galactosyltransferase. J. Biol. Chem. 240 (1965) 4115–4117. [PMID: 5842076]
2.  Yip, G.B. and Dain, J.A. The enzymic synthesis of ganglioside. II. UDP-galactose: N-acetylgalactosaminyl-(N-acetylneuraminyl)galactosyl-glucosyl-ceramide galactosyltransferase in rat brain. Biochim. Biophys. Acta 206 (1970) 252–260. [DOI] [PMID: 4987145]
3.  Yip, M.C.M. and Dain, J.A. Frog brain uridine diphosphate galactose-N-acetylgalactosaminyl-N-acetylneuraminylgalactosylglucosylceramide galactosyltransferase. Biochem. J. 118 (1970) 247–252. [PMID: 5484669]
[EC 2.4.1.62 created 1972, modified 2013]
 
 
EC 2.4.1.80     
Accepted name: ceramide glucosyltransferase
Reaction: UDP-α-D-glucose + an N-acylsphingosine = UDP + a β-D-glucosyl-N-acylsphingosine
For diagram of glycolipid biosynthesis, click here
Other name(s): UDP-glucose:ceramide glucosyltransferase; ceramide:UDP-Glc glucosyltransferase; uridine diphosphoglucose-ceramide glucosyltransferase; ceramide:UDP-glucose glucosyltransferase; glucosylceramide synthase; UDP-glucose:N-acylsphingosine D-glucosyltransferase
Systematic name: UDP-α-D-glucose:N-acylsphingosine β-D-glucosyltransferase (configuration-inverting)
Comments: Sphingosine and dihydrosphingosine can also act as acceptors; CDP-glucose can act as donor.
Links to other databases: BRENDA, EXPASY, KEGG, MetaCyc, CAS registry number: 37237-44-8
References:
1.  Basu, S., Kaufman, B. and Roseman, S. Enzymatic synthesis of glucocerebroside by a glucosyltransferase from embryonic chicken brain. J. Biol. Chem. 248 (1973) 1388–1394. [PMID: 4631392]
[EC 2.4.1.80 created 1976]
 
 
EC 3.2.1.45     
Accepted name: glucosylceramidase
Reaction: a D-glucosyl-N-acylsphingosine + H2O = D-glucose + a ceramide
For diagram of glycolipid biosynthesis, click here
Glossary: a ceramide = an N-acylsphingosine
Other name(s): psychosine hydrolase; glucosphingosine glucosylhydrolase; GlcCer-β-glucosidase; β-D-glucocerebrosidase; glucosylcerebrosidase; β-glucosylceramidase; ceramide glucosidase; glucocerebrosidase; glucosylsphingosine β-glucosidase; glucosylsphingosine β-D-glucosidase
Systematic name: D-glucosyl-N-acylsphingosine glucohydrolase
Comments: Also acts on glucosylsphingosine (cf. EC 3.2.1.62 glycosylceramidase).
Links to other databases: BRENDA, EXPASY, KEGG, MetaCyc, PDB, CAS registry number: 37228-64-1
References:
1.  Brady, R.O., Kanfer, J.N. and Shapiro, D. The metabolism of glucocerebrosides. I. Preparation and properties of a glucocerebroside-cleaving enzyme from spleen tissue. J. Biol. Chem. 240 (1966) 39–43. [PMID: 14253443]
2.  Vaccaro, A.M., Muscillo, M. and Suzuki, K. Characterization of human glucosylsphingosine glucosyl hydrolase and comparison with glucosylceramidase. Eur. J. Biochem. 146 (1985) 315–321. [DOI] [PMID: 3967661]
[EC 3.2.1.45 created 1972]
 
 
EC 3.5.1.109     
Accepted name: sphingomyelin deacylase
Reaction: (1) an N-acyl-sphingosylphosphorylcholine + H2O = a fatty acid + sphingosylphosphorylcholine
(2) a D-glucosyl-N-acylsphingosine + H2O = a fatty acid + D-glucosyl-sphingosine
Glossary: sphingomyelin = N-acyl-sphingosylphosphorylcholine
D-glucosyl-N-acylsphingosine = glucosylceramide
Other name(s): SM deacylase; GcSM deacylase; glucosylceramide sphingomyelin deacylase; sphingomyelin glucosylceramide deacylase; SM glucosylceramide GCer deacylase; SM-GCer deacylase; SMGCer deacylase
Systematic name: N-acyl-sphingosylphosphorylcholine amidohydrolase
Comments: The enzyme is involved in the sphingolipid metabolism in the epidermis.
Links to other databases: BRENDA, EXPASY, KEGG, MetaCyc
References:
1.  Hara, J., Higuchi, K., Okamoto, R., Kawashima, M. and Imokawa, G. High-expression of sphingomyelin deacylase is an important determinant of ceramide deficiency leading to barrier disruption in atopic dermatitis. J. Invest. Dermatol. 115 (2000) 406–413. [DOI] [PMID: 10951276]
2.  Higuchi, K., Hara, J., Okamoto, R., Kawashima, M. and Imokawa, G. The skin of atopic dermatitis patients contains a novel enzyme, glucosylceramide sphingomyelin deacylase, which cleaves the N-acyl linkage of sphingomyelin and glucosylceramide. Biochem. J. 350 (2000) 747–756. [PMID: 10970788]
3.  Ishibashi, M., Arikawa, J., Okamoto, R., Kawashima, M., Takagi, Y., Ohguchi, K. and Imokawa, G. Abnormal expression of the novel epidermal enzyme, glucosylceramide deacylase, and the accumulation of its enzymatic reaction product, glucosylsphingosine, in the skin of patients with atopic dermatitis. Lab. Invest. 83 (2003) 397–408. [PMID: 12649340]
[EC 3.5.1.109 created 2011]
 
 


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