Abstract
Lipophorin was isolated from the stalk borer, Busseola fusca, larvae by ultracentrifugation in a KBr density-gradient. The lipophorin ( Mr ~ 700,000) is a high density lipoprotein (density = 1.13 g/ml) composed of 46% lipids and 4% carbohydrates. It consists of two apoproteins, apolipophorin-I (apoLp-I, Mr ~ 210,000) and apolipophorin-II (apoLp-II, Mr ~78,000). Both apoproteins are glycosylated as shown by periodate Schiff reagent staining and binding to the lectin, concanavalin A. Amino acid composition analysis of lipophorin showed predominance of aspartate (13%), glutamate (9%) and glycine (9%).
In an immunoblotting experiment, both apoproteins showed immunoreactivity with antiserum to B. fusca lipophorin and no cross-reactivity occurred with any other haemolvmph proteins. Immunodiffusion studies with the same antibodies showed cross-reactivity with haemolymph derived from other Lepidoptera and not from Orthoptera, Dictyoptera or Diptera.
Résumé
Une lipophorine a été isolée des larves de Busseola fusca, par ultracentrifugation avec gradient de densité. La lipophorine dont le poids moléculaire est d’environ ~700,000 est une lipoprotéine de densité élevée (1.13 mg/ml) composée de 46% de lipides et de 4% de glucides. La lipophorine comporte 2 apoprotéines: l’apolipophorine-I (apoLp-I, de poids moléculaire environ ~210,000) et l’apolipophorine-II (apoLp-II, de poids moléculaire ~78,000). Les deux apoprotéines sont glycosylées comme le démontre la coloration au réactif du périodate de Schiff (PAS). La présence de manose comportant des chaines d’oligosaccharides a été établie par la réaction d’attachement de la lipophorine à la concanavaline-A sur colonne de sépharose. L’analyse de la composition en acides aminés de la lipophorine montre une prédominance d’aspartate (13%), de glutamate (9%) et de glycine (9%). Au cours de tests d’immunoblotting, les antisera des deux apoprotéines de la lipophorine ont réagi avec les anticorps. Nos résultats suggèrent également que les lipophorines d’insectes du même ordre développeraient une cross réaction.
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Ogoyi, D.O., Osir, E.O. & Ochanda, J.O. Ophorin of the Larval Stalk Borer, Busseola Fusca: Purification and Properties. Int J Trop Insect Sci 14, 167–172 (1993). https://doi.org/10.1017/S1742758400014569
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DOI: https://doi.org/10.1017/S1742758400014569