Distribution of glycosylinositol phosphoceramide-specific phospholipase D activity in plants.
Previously, we detected an unknown sphingophospholipid in cabbage leaves and identified it as phytoceramide-1-phosphate (PC1P). We also found an enzyme activity that produces PC1P by glycosylinositol phosphoceramide (GIPC)-specific hydrolysis in cabbage leaves. To characterize the GIPC-specific phospholipase D (GIPC-PLD) activity, we investigated distributions of GIPC-PLD activity in 25 tissues of 10 plants. In most plants, the GIPC-PLD activity was the highest in roots. Young leaves of cabbage and Welsh onion had higher activities than corresponding aged outer leaves. The GIPC-PLD activities in leaves, stems and roots of mung bean were higher in the sprouting stage than in more mature stages. We also examined the distribution of substrate GIPC and product PC1P and found that GIPC was ubiquitously distributed at 50–280 nmol/g (wet wt) in tissues of plants, whereas PC1P was detectable (3–60 nmol/g wet wt.) only in tissues showing considerable GIPC-PLD activity. These results suggest a possibility that GIPC-PLD activity is involved in plant growth.
Institute of Biomedical Sciences, Tokushima University Graduate School, Tokushima, 770-8505, Japan.
Takashi
T
Kida
Institute of Biomedical Sciences, Tokushima University Graduate School, Tokushima, 770-8505, Japan.
Aoi
A
Itoh
Institute of Biomedical Sciences, Tokushima University Graduate School, Tokushima, 770-8505, Japan.
Akari
A
Kimura
Institute of Biomedical Sciences, Tokushima University Graduate School, Tokushima, 770-8505, Japan.
Hisatsugu
H
Matsuoka
Department of Biology, Graduate School of Natural Science, Konan University, Kobe, 658-8501, Japan.
Hiroyuki
H
Imai
Institute of Biomedical Sciences, Tokushima University Graduate School, Tokushima, 770-8505, Japan.
Kentaro
K
Kogure
Department of Pharmaceutical Life Sciences, Faculty of Pharmacy, Yasuda Women's University, Hiroshima, 731-0351, Japan.
Akira
A
Tokumura
Institute of Biomedical Sciences, Tokushima University Graduate School, Tokushima, 770-8505, Japan.
Tamotsu
T
Tanaka
D001937:Brassica / Q000737:chemistry / Q000378:metabolism*; D002518:Ceramides / Q000096:biosynthesis / Q000737:chemistry; D018552:Daucus carota / Q000737:chemistry / Q000378:metabolism*; D006028:Glycosphingolipids / Q000737:chemistry / Q000378:metabolism*; D015394:Molecular Structure; D010739:Phospholipase D / Q000737:chemistry / Q000378:metabolism*; D018515:Plant Leaves / Q000737:chemistry / Q000378:metabolism; D031224:Raphanus / Q000737:chemistry / Q000378:metabolism*; D018724:Spinacia oleracea / Q000737:chemistry / Q000378:metabolism*
D002518:Ceramides; D006028:Glycosphingolipids; C065576:ceramide 1-phosphate; D010739:Phospholipase D
glycosylinositol phosphoceramide; phospholipase D; plants; sphingophospholipid