A rapid fluorescence assay for sphingosine-1-phosphate lyase enzyme activity
Sphingosine-1-phosphate (S1P) lyase (SPL) catalyzes the conversion of S1P to ethanolamine phosphate and hexadecenal. This enzyme plays diverse roles in physiology and disease and, thus, may be useful as a disease marker and/or drug target. Unfortunately, the radioisotope-based assay currently used t...
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2007-12-01
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doaj-86e3719c83c54762af0097985abd62fa2021-04-28T06:08:00ZengElsevierJournal of Lipid Research0022-22752007-12-01481227692778A rapid fluorescence assay for sphingosine-1-phosphate lyase enzyme activityPadmavathi Bandhuvula0Henrik Fyrst1Julie D. Saba2Children's Hospital, Oakland Research Institute, Oakland, CA 94609Children's Hospital, Oakland Research Institute, Oakland, CA 94609Children's Hospital, Oakland Research Institute, Oakland, CA 94609Sphingosine-1-phosphate (S1P) lyase (SPL) catalyzes the conversion of S1P to ethanolamine phosphate and hexadecenal. This enzyme plays diverse roles in physiology and disease and, thus, may be useful as a disease marker and/or drug target. Unfortunately, the radioisotope-based assay currently used to quantify SPL activity is suboptimal. We have devised an assay using a commercially available ω(7-nitro-2-1,3-benzoxadiazol-4-yl)-d-erythro (NBD)-labeled fluorescent substrate. Alternatively, we provide a method for synthesis of the substrate from NBD-sphingosine. Enzyme activity is determined by following the formation of NBD-aldehyde product, which is isolated from unreacted substrate by lipid extraction and quantified after separation by HPLC using a C18 column. A fluorescent NBD-C18-sphingosine internal standard is used to control for extraction efficiency. The reaction is linear over 20 min and total protein concentrations of 20–200 mg/l. The sensitivity of the fluorescence assay is comparable to or better than that of the radioactive assay, and SPL levels as low as 8 pmol/mg/min were readily detected. Semicarbazide, a nonspecific SPL inhibitor, reduced SPL activity in vitro by ∼70% using both standard and fluorescence methods. Product inhibition was not observed using ethanolamine phosphate and a commercially available source of hexadecenal. This method is suitable for quantifying SPL activity in a variety of cell and tissue sources.http://www.sciencedirect.com/science/article/pii/S002222752042927Xhigh-performance liquid chromatographyω(7-nitro-2-1,3-benzoxadiazol-4-yl)-d-erythro-sphingosinesphingosine-1-phosphatedihydrosphingosine-1-phosphate |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Padmavathi Bandhuvula Henrik Fyrst Julie D. Saba |
spellingShingle |
Padmavathi Bandhuvula Henrik Fyrst Julie D. Saba A rapid fluorescence assay for sphingosine-1-phosphate lyase enzyme activity Journal of Lipid Research high-performance liquid chromatography ω(7-nitro-2-1,3-benzoxadiazol-4-yl)-d-erythro-sphingosine sphingosine-1-phosphate dihydrosphingosine-1-phosphate |
author_facet |
Padmavathi Bandhuvula Henrik Fyrst Julie D. Saba |
author_sort |
Padmavathi Bandhuvula |
title |
A rapid fluorescence assay for sphingosine-1-phosphate lyase enzyme activity |
title_short |
A rapid fluorescence assay for sphingosine-1-phosphate lyase enzyme activity |
title_full |
A rapid fluorescence assay for sphingosine-1-phosphate lyase enzyme activity |
title_fullStr |
A rapid fluorescence assay for sphingosine-1-phosphate lyase enzyme activity |
title_full_unstemmed |
A rapid fluorescence assay for sphingosine-1-phosphate lyase enzyme activity |
title_sort |
rapid fluorescence assay for sphingosine-1-phosphate lyase enzyme activity |
publisher |
Elsevier |
series |
Journal of Lipid Research |
issn |
0022-2275 |
publishDate |
2007-12-01 |
description |
Sphingosine-1-phosphate (S1P) lyase (SPL) catalyzes the conversion of S1P to ethanolamine phosphate and hexadecenal. This enzyme plays diverse roles in physiology and disease and, thus, may be useful as a disease marker and/or drug target. Unfortunately, the radioisotope-based assay currently used to quantify SPL activity is suboptimal. We have devised an assay using a commercially available ω(7-nitro-2-1,3-benzoxadiazol-4-yl)-d-erythro (NBD)-labeled fluorescent substrate. Alternatively, we provide a method for synthesis of the substrate from NBD-sphingosine. Enzyme activity is determined by following the formation of NBD-aldehyde product, which is isolated from unreacted substrate by lipid extraction and quantified after separation by HPLC using a C18 column. A fluorescent NBD-C18-sphingosine internal standard is used to control for extraction efficiency. The reaction is linear over 20 min and total protein concentrations of 20–200 mg/l. The sensitivity of the fluorescence assay is comparable to or better than that of the radioactive assay, and SPL levels as low as 8 pmol/mg/min were readily detected. Semicarbazide, a nonspecific SPL inhibitor, reduced SPL activity in vitro by ∼70% using both standard and fluorescence methods. Product inhibition was not observed using ethanolamine phosphate and a commercially available source of hexadecenal. This method is suitable for quantifying SPL activity in a variety of cell and tissue sources. |
topic |
high-performance liquid chromatography ω(7-nitro-2-1,3-benzoxadiazol-4-yl)-d-erythro-sphingosine sphingosine-1-phosphate dihydrosphingosine-1-phosphate |
url |
http://www.sciencedirect.com/science/article/pii/S002222752042927X |
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