Lipid composition of Cryptococcus neoformans.

Abstract

The lipid composition of Cryptococcus neoformans grown in Sabouraud's dextrose broth (shake culture) was analysed. The organism contained extremely low amounts of lipid (0.96% dry weight basis) of which 86.1% were nonpolaris lipids, 3.4% phospholipids and the rest were glycolipids and pigments. Alkoxylipids (41%), tryglicerides (18%), diglycerides (7.4%), free fatty acids (5.4%), sterols (4.7%), sterol ester (3.9%) and monoglycerides (2.2%) were found in the nonpolar lipid fraction of C. neoformans. The phospholipid composition (expressed as relative abundance) was: phosphatidylinositol (11.5%), lysophosphatidyl ethanolamine (10.9%), cardiolipin (10.1%), a glycophospholipid (9.5%), lysophosphatidyl choline (4.7%), phosphatidic acid (4.1%), phosphatidyl choline (28.1%), phosphatidyl ethanolamine (14.5%) and an unidentified lipid (6.5%). Phosphatidyl serine, sphingolipids and cerebrosides, generally found in yeast-like fungi, were absent. Probable reasons for the abnormally low lipid content are discussed.