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Original Article

Lipid composition of Paracoccidioides brasiliensis: Comparison between the yeast and mycelial forms

Pages 281-286 | Received 11 Feb 1980, Accepted 07 May 1980, Published online: 09 Jul 2009
 

Abstract

The total lipid extracted from the yeast form of Paracoccidioides brasiliensis was twice as much as from the mycelial form. In both morphological forms neutral lipids were predominant and triglycerides were the greatest single component in the extracts. Relative percentage of phospholipid was higher in Y form than in M form. Phosphatidylcholine was predominant in the former and phosphatidylethanolamine in the latter. Diphosphatidylglycerol was the most unsaturated lipid in both the forms, and in the Y form it was the only individual class of lipid that contained a greater percentage of linoleic than oleic acid. Otherwise, the lipids of Y form, both neutral and polar, were characterized by a greater percentage of oleic acid and those of the M form by the predominance of linoleic acid. Differential distribution of phosphatidylcholine, phosphatidylethanolamine, sterol, oleic and linoleic acid in Y and M forms is interpreted to suggest a possible role of cellular lipid composition in the dimorphic behaviour of P. brasiliensis.

Zusammenfassung

Die Hefeform von Paracoccidioides brasiliensis enthält doppelt soviele extrahierbare Lipide wie die Myzelform. In beiden morphologischen Formen überwogen die neutralen Lipide und die grösste einzelne Komponente in den Extrakten waren Triglyzeride. Der relative Anteil der Phospholipide war höher in der Hefe-Form (H-Form) als in der Myzelform. Phosphatidylcholine überwogen in der H-Form, Phosphatidylethanolamine in der Myzel-Form (M-Form). Diphosphatidylglyzerin war das Lipid mit den meisten ungesättigten Fetten in beiden morphologischen Formen, und in der H-Form war es die einzige Klasse von Lipiden, die einen grösseren Anteil an Linoelin- als Oleinsäure enthielt. Andererseits waren die Lipide (polar oder neutral) in der H-Form charakterisiert durch einen grösseren Anteil von Oleinsäure und die Lipide der M-Form durch einen grösseren Anteil von Linoleinsäure. Die Differential-Verteilung von Phosphatidylcholin, Phosphatidylethanolamin, Sterol, Olein und Linoleinsäure in H- und M-Formen ist interpretiert im Sinne einer möglichen Rolle der Zusammensetzung von zellulären Lipiden in dem dimorphen Verhalten der Paracoccidioides brasiliensis.

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