Title

Analogs of unusual sponge phospholipids. Synthesis and thermotropic properties of 1,2-di-(6Z,9Z)-6,9-hexacosadienoyl phosphatidylcholine and phosphatidylethanolamine

ORCiD

Nejat Düzgüneş: 0000-0001-6159-1391

Document Type

Article

Publication Title

Chemistry and Physics of Lipids

ISSN

0009-3084

Volume

48

Issue

1-2

DOI

10.1016/0009-3084(88)90138-7

First Page

109

Last Page

117

Publication Date

1-1-1988

Abstract

The major marine sponge phospholipids 1,2-di-(5Z,9Z)-5,9-hexacosadienoyl phosphatidylcholine (PC) and phosphatidylethanolamine (PE) hardly incorporate cholesterol into their liposomal bilayers, as reported earlier. Our previous studies indicated that their synthetic short chain (C18-C24) analogs with the same double bond pattern readily incorporated cholesterol, thus demonstrating the importance of the chain length. In order to investigate the possible role of the unusual Δ5,9 diunsaturation 1,2-di-(6Z,9Z)-6,9-hexacosadienoyl phosphatidylcholine and phosphatidylethanolamine were synthesized and their thermotropic behavior studied. Both analogs shows a transition endoterm at 45°C, while the natural 1,2-di-(5Z,9Z)-5,9-hexacosadienoyl PC and its PE counterpart exhibited it at 42°C. A partial incorporation of cholesterol into liposomal bilayers of 1,2-di-(6Z,9Z)-6,9-hexacosadienoyl PC was observed. Our results suggest that while the chain length is the predominant factor in the interactions of these phospholipids with sterols, the double bond location may also play a contributing role. © 1988.

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