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J. Biol. Chem., Vol. 275, Issue 50, 39793-39798, December 15, 2000
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§,
¶,
,
,
,
**
From the Sphingolipids have emerged as novel bioactive
mediators in eukaryotic cells including yeast. It has been proposed
that sphingomyelin (SM) hydrolysis and the concomitant generation of
ceramide are involved in various stress responses in mammalian cells.
The yeast Saccharomyces cerevisiae has inositol
phosphosphingolipids (IPS) instead of SM and glycolipids, and synthesis
of IPS is indispensable to its growth. Although the genes responsible
for the synthesis of IPS have been identified, the gene(s) for the
degradation of IPS has not been reported. Here we show that
ISC1 (YER019w), which has homology
to bacterial neutral sphingomyelinase (SMase), encodes IPS
phospholipase C (IPS-PLC). First, we observed that overexpression of
ISC1 greatly increased neutral SMase activity, and this
activity was dependent on the presence of phosphatidylserine. Cells
deleted in ISC1 demonstrated negligible neutral SMase
activity. Because yeast cells have IPS instead of SM, we investigated
whether IPS are the physiologic substrates of this enzyme. Lysates of
ISC1-overexpressing cells demonstrated very high PLC
activities on IPS. Deletion of ISC1 eliminated endogenous
IPS-PLC activities. Labeling yeast cells with
[3H]dihydrosphingosine showed that IPS were increased in
the deletion mutant cells. This study identifies the first enzyme
involved in catabolism of complex sphingolipids in S. cerevisiae.
Department of Biochemistry and Molecular
Biology and the
Ralph H. Johnson Veterans Administration
Hospital and the Department of Medicine, Medical University of South
Carolina, Charleston, South Carolina 29425 and the
§ Department of Medicine, Osaka Dental University, 8-1 Kuzuhahanazonocho, Hirakata, Osaka 573, Japan
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