Characterization of the reversible nature of the reaction catalyzed by sphingolipid ceramide N-deacylase: A novel form of reverse hydrolysis reaction

Katsuhiro Kita, Toyohisa Kurita, Makoto Ito

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

Sphingolipid ceramide N-deacylase catalyzes a reversible reaction in which the amide linkages of the ceramides of various sphingolipids are cleaved or synthesized. Hydrolysis of sphingolipids by the enzyme proceeded efficiently at acidic pH in the presence of high concentrations of detergents, whereas the reverse reaction tended to be favored at neutral pH with a decrease in the detergent concentration. Although the catalytic efficiency (V max/K m) of the hydrolysis and reverse reactions was changed mainly by the concentration of detergents in the reaction mixture, V max and K m for the reverse reaction were relatively higher than those for the forward reaction, irrespective of the detergent concentration. The reverse reaction proceeded most efficiently when the molar ratio of lyso-sphingolipids and fatty acids was fixed at 1 : 1-2, the yield of the reaction exceeding 70-80%. The reverse and exchange (transacylation) reactions did not require ATP, CoA, metal ions or addition of organic solvents. Studies using inhibitors and chemical modifiers of the enzyme protein suggested that both the hydrolysis and condensation reactions are catalyzed at the same catalytic domain. These results indicate that the reverse hydrolysis reaction of the enzyme is unique, being completely different from those of lipases, proteases and glycosidases reported to date.

Original languageEnglish
Pages (from-to)592-602
Number of pages11
JournalEuropean Journal of Biochemistry
Volume268
Issue number3
DOIs
Publication statusPublished - Sep 27 2001

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Detergents
Sphingolipids
Hydrolysis
Enzymes
Condensation reactions
Ceramides
Glycoside Hydrolases
Coenzyme A
Lipase
Amides
Organic solvents
Metal ions
Catalytic Domain
Peptide Hydrolases
Fatty Acids
Adenosine Triphosphate
Metals
Ions
sphingolipid ceramide N-deacylase
Proteins

All Science Journal Classification (ASJC) codes

  • Biochemistry

Cite this

Characterization of the reversible nature of the reaction catalyzed by sphingolipid ceramide N-deacylase : A novel form of reverse hydrolysis reaction. / Kita, Katsuhiro; Kurita, Toyohisa; Ito, Makoto.

In: European Journal of Biochemistry, Vol. 268, No. 3, 27.09.2001, p. 592-602.

Research output: Contribution to journalArticle

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