Abstract
The cyclopropane fatty acids 17-methyl-trans-4,5-methyleneoctadecanoic acid, 18-methyl-trans-4,5-methylenenonadecanoic acid, and 17-methyl-trans-4,5-methylenenonadecanoic acid were characterized for the first time in nature in the phospholipids (mainly PE, PG and PS) of the hermit-crab sponge Pseudospongosorites suberitoides. Pyrrolidine derivatization was the key in identifying the position of the cyclopropyl and methyl groups in the acyl chains and 1H NMR was used to determine the trans stereochemistry of the cyclopropane ring. The phospholipids from the sponge also contained an interesting series of iso-anteiso Δ5,9 fatty acids with chain-lengths between 17 and 21 carbons, with the fatty acids (5Z,9Z)-18-methyl-5,9-nonadecadienoic acid and the (5Z,9Z)-17-methyl-5,9-nonadecadienoic acid being described for the first time in sponges. The anteiso α-methoxylated fatty acid 2-methoxy-12-methyltetradecanoic acid was also identified for the first time in nature in the phospholipids of this interesting marine sponge. The novel cyclopropyl fatty acids could have originated from the phospholipids of a cyanobacterium living in symbiosis with the sponge.
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Abbreviations
- ATCC:
-
American type culture collection
- ECL:
-
Equivalent chain length
- FAME:
-
Fatty acid methyl ester
- GC–MS:
-
Gas chromatography–mass spectrometry
- PE:
-
Phosphatidylethanolamine
- PG:
-
Phosphatidylglycerol
- PS:
-
Phosphatidylserine
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Acknowledgments
This work was supported by a grant from the SCORE program of the National Institutes of Health (grant no. S06GM08102). J. Vicente thanks the NIH-MARC program for an undergraduate fellowship.
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Carballeira, N.M., Montano, N., Vicente, J. et al. Novel Cyclopropane Fatty Acids from the Phospholipids of the Caribbean Sponge Pseudospongosorites suberitoides . Lipids 42, 519–524 (2007). https://doi.org/10.1007/s11745-007-3047-3
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DOI: https://doi.org/10.1007/s11745-007-3047-3