Table 3. Effects of various lipids and amines on pGal3ST activity.

Concentrations of lipids and amines were 0.005% (w/v). The relative activities were calculated with respect to the values of D-sphingosine, which was set as 100. The enzymatic activities represent the means for four independent experiments (S.D. was <5%).

Compound	Relative activity (%)
L-α-Phosphatidic acid	<1
α-Phosphatidylcholine	<1
L-α-Lysophosphatidylcholine	<1
L-α-Phosphatidylethanolamine	<1
L-α-Phosphatidylinositol	<1
L-α-Phosphatidyl-L-serine	<1
Sphingomyelin	<1
Ceramides	<1
Spermine	76
Spermidine	6
Putrescine	2
D-sphingosine	100
N,N-Dimethylsphingosine	86
N-Acetyl-D-sphingosine	<1
N-Stearoyl-D-sphingosine	<1
Psychosine	65
Sphingosine 1-phosphate	17
Stearylamine	103
Octylamine	<1
CHAPS	<1
Hexadecyltrimethylammonium bromide	105
1-Dodecylpyridinium chloride	83