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. 1994 Dec 1;304(Pt 2):603–609. doi: 10.1042/bj3040603

Glycoinositol-phospholipid profiles of four serotypically distinct Old World Leishmania strains.

P Schneider 1, L F Schnur 1, C L Jaffe 1, M A Ferguson 1, M J McConville 1
PMCID: PMC1137534  PMID: 7998997

Abstract

Glycoinositol-phospholipids (GIPLs) are the major glycolipid class and prominant surface antigens of leishmanial parasites. The GIPLs from four serologically distinct Old World strains of Leishmania were characterized to determine inter- and intra-specific differences in these glycolipids. These studies showed that: (1) the major GIPLs of Leishmania topica (LRC-L36) and Leishmania aethiopica (LRC-L495) belong to the alpha-mannose-terminating GIPL series (iM2, iM3 and iM4) that are structurally related to the glycosyl-phosphatidylinositol anchors of both the surface proteins and the abundant lipophosphoglycan (LPG). In contrast, the GIPLs from two Leishmania major strains (LRC-L456 and LRC-L580) belong to the alpha-galactose-terminating GIPL series (GIPL-1, -2 and -3) that are more structurally related to the LPG anchor; (2) the GIPL profiles of the L. major strains differed in that a significant proportion of the GIPL-2 and -3 species (approximately 40% and 80%, respectively) in LRC-L580 are substituted with a glucose-1-PO4 residue, while this type of substitution was not detected in LRC-L456; and (3) all the GIPLs contained either an alkylacyl- or a lysoalkyl-phosphatidylinositol lipid moiety. However, the alkyl chain compositions of different GIPLs within the same strain was variable. In L. major, the major GIPL species contained alkylacylglycerols with predominantly C18:0 and C24:0 alkyl chains, whereas the glucose-1-PO4-substituted GIPLs contained exclusively lysoalkylglycerols with C24:0 alkyl chains. In L. tropica, the major GIPL, iM2, contained predominantly C24:0 alkyl chains whereas the structurally related iM3 and iM4 GIPLs in this strain contained predominantly C18:0 alkyl chains. In L. aethiopica all the GIPLs (iM2, iM3, iM4) contained C18:0 alkyl chains. These data suggest that the synthesis of the GIPLs may occur in more than one subcellular compartment. The possibility that species-specific differences in the predominantly surface glycan structures may modulate the interaction of the parasite with the insect and mammalian hosts is discussed.

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Selected References

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