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JBC, Vol. 251, Issue 10, 2976-2982, May, 1976

Lipophosphonoglycan of the plasma membrane of A canthamoeba castellanii. Inositol and phytosphingosine content and general structural features

D. G. Dearborn, S. Smith and E. D. Korn

Lipophosphonoglycan, a major component of the plasma membrane of Acanthamoeba castellanii, has now been shown to contain 8% inositol and 13% C25- and C24-phytosphingosines in addition to the previously identified content of neutral sugars (26%), amino sugars (3%), aminophosphonates (10%), acidhydrolyzable phosphate (3%), and long chain fatty acids (14%). The fatty acids and phytosphingosines are in ceramide groups. Lipophosphonoglycan can be separated by dodecyl sulfate-polyacrylamide electrophoresis into two major components that are similar in composition except for different oligosaccharide groups. A tentative structural model incorporating these features is proposed in which each of the two components of lipophosphonoglycan is conceived as an oligomeric inositol-containing glycosphingolipid.
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