Sphingomyelin deacylase

Sphingomyelin deacylase (EC 3.5.1.109, SM deacylase, GcSM deacylase, glucosylceramide sphingomyelin deacylase, sphingomyelin glucosylceramide deacylase, SM glucosylceramide GCer deacylase, SM-GCer deacylase, SMGCer deacylase) is an enzyme with systematic name N-acyl-sphingosylphosphorylcholine amidohydrolase.^[1]^[2]^[3] This enzyme catalyses the following chemical reaction

(1) an N-acyl-sphingosylphosphorylcholine + H₂O

\rightleftharpoons

a fatty acid + sphingosylphosphorylcholine;;

(2) a D-glucosyl-N-acylsphingosine + H₂O

\rightleftharpoons

a fatty acid + D-glucosyl-sphingosine

The enzyme is involved in the sphingolipid metabolism in the epidermis.

References

↑ Hara, J., Higuchi, K., Okamoto, R., Kawashima, M. and Imokawa, G. (2000). "High-expression of sphingomyelin deacylase is an important determinant of ceramide deficiency leading to barrier disruption in atopic dermatitis". J. Invest. Dermatol. 115: 406–413. doi:10.1046/j.1523-1747.2000.00072.x. PMID 10951276.
↑ Higuchi, K., Hara, J., Okamoto, R., Kawashima, M. and Imokawa, G. (2000). "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: 747–756. doi:10.1042/0264-6021:3500747. PMID 10970788.
↑ Ishibashi, M., Arikawa, J., Okamoto, R., Kawashima, M., Takagi, Y., Ohguchi, K. and Imokawa, G. (2003). "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: 397–408. doi:10.1097/01.lab.0000059931.66821.92. PMID 12649340.

External links

Sphingomyelin deacylase at the US National Library of Medicine Medical Subject Headings (MeSH)

Hydrolases: carbon-nitrogen non-peptide (EC 3.5)

3.5.1: Linear amides / Amidohydrolases	Asparaginase Glutaminase Urease Biotinidase Aspartoacylase Ceramidase Aspartylglucosaminidase Fatty acid amide hydrolase Histone deacetylase Sirtuin

3.5.2: Cyclic amides/ Amidohydrolases	Barbiturase Beta-lactamase

3.5.3: Linear amidines/ Ureohydrolases	Arginase Agmatinase Protein-arginine deiminase

3.5.4: Cyclic amidines/ Aminohydrolases	Guanine deaminase Adenosine deaminase AMP deaminase Inosine monophosphate synthase DCMP deaminase GTP cyclohydrolase I Cytidine deaminase AICDA Activation-induced cytidine deaminase

3.5.5: Nitriles/ Aminohydrolases	Nitrilase

3.5.99: Other	Riboflavinase Thiaminase II

Enzymes

Activity	Active site Binding site Catalytic triad Oxyanion hole Enzyme promiscuity Catalytically perfect enzyme Coenzyme Cofactor Enzyme catalysis Enzyme kinetics Lineweaver–Burk plot Michaelis–Menten kinetics

Regulation	Allosteric regulation Cooperativity Enzyme inhibitor

Classification	EC number Enzyme superfamily Enzyme family List of enzymes

Types	EC1 Oxidoreductases(list) EC2 Transferases(list) EC3 Hydrolases(list) EC4 Lyases(list) EC5 Isomerases(list) EC6 Ligases(list)

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