Characterization of membrane properties of inositol phosphorylceramide

Biochimica Et Biophysica Acta
Anders BjörkbomJ Peter Slotte

Abstract

Inositol phosphorylceramides (IPCs) are a class of anionic sphingolipids with a single inositol-phosphate head group coupled to ceramide. IPCs and more complex glycosylated IPCs have been identified in fungi, plants and protozoa but not in mammals. IPCs have also been identified in detergent resistant membranes in several organisms. Here we report on the membrane properties of the saturated N-palmitoyl-IPC (P-IPC) in one component bilayers as well as in complex bilayers together with 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine and cholesterol. The membrane properties of P-IPC were shown to be affected by calcium. According to anisotropy changes reported by DPH, the gel-to-liquid transition temperature (T(m)) of P-IPC was 48 degrees C. Addition of 5 mM CaCl(2) during vesicle preparation markedly increased the T(m) (65 degrees C). According to fluorescence quenching experiments in complex lipid mixtures, P-IPC formed sterol containing domains in an otherwise fluid environment. The P-IPC containing domains melted at a lower temperature and appeared to contain less sterol as compared to domains containing N-palmitoyl-sphingomyelin. Calcium further reduced the sterol content of the ordered domains and also increased the thermal...Continue Reading

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Citations

Jun 10, 2010·The Journal of Organic Chemistry·Zheng LiuRobert Bittman
Jul 22, 2010·The Journal of Biological Chemistry·Christian KloseKai Simons
Aug 12, 2015·Langmuir : the ACS Journal of Surfaces and Colloids·Joaquim T MarquêsRodrigo F M de Almeida
Sep 11, 2019·FEMS Microbiology Reviews·Alexandros AthanasopoulosChristos Gournas
Aug 30, 2020·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Luís Borges-Araújo, Fabio Fernandes
Nov 4, 2020·FEBS Letters·Filipa C SantosRodrigo F M de Almeida

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