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1.
Glycoconj J ; 37(1): 57-76, 2020 02.
Artículo en Inglés | MEDLINE | ID: mdl-31828568

RESUMEN

The milk oligosaccharides were studied for two species of the Carnivora: the American black bear (Ursus americanus, family Ursidae, Caniformia), and the cheetah, (Acinonyx jubatus, family Felidae, Feliformia). Lactose was the most dominant saccharide in cheetah milk, while this was a minor saccharide and milk oligosaccharides predominated over lactose in American black bear milk. The structures of 8 neutral saccharides from American black bear milk were found to be Gal(ß1-4)Glc (lactose), Fuc(α1-2)Gal(ß1-4)Glc (2'-fucosyllactose), Gal(α1-3)Gal(ß1-4)Glc (isoglobotriose), Gal(α1-3)[Fuc(α1-2)]Gal(ß1-4)Glc (B-tetrasaccharide), Gal(α1-3)[Fuc(α1-2)]Gal(ß1-4)[Fuc(α1-3)]Glc (B-pentasaccharide), Fuc(α1-2)Gal(ß1-4)[Fuc(α1-3)]GlcNAc(ß1-3)Gal(ß1-4)Glc (difucosyl lacto-N-neotetraose), Gal(α1-3)Gal(ß1-4)[Fuc(α1-3)]GlcNAc(ß1-3)Gal(ß1-4)Glc (monogalactosyl monofucosyl lacto-N-neotetraose) and Gal(α1-3)Gal(ß1-4)GlcNAc(ß1-3)Gal(ß1-4)Glc (Galili pentasaccharide). Structures of 5 acidic saccharides were also identified in black bear milk: Neu5Ac(α2-3)Gal(ß1-4)Glc (3'-sialyllactose), Neu5Ac(α2-6)Gal(ß1-4)GlcNAc(ß1-3)[Fuc(α1-2)Gal(ß1-4)GlcNAc(ß1-6)]Gal(ß1-4)Glc (monosialyl monofucosyl lacto-N-neohexaose), Neu5Ac(α2-6)Gal(ß1-4)GlcNAc(ß1-3)[Gal(α1-3)Gal(ß1-4)GlcNAc(ß1-6)]Gal(ß1-4)Glc (monosialyl monogalactosyl lacto-N-neohexaose), Neu5Ac(α2-6)Gal(ß1-4)GlcNAc(ß1-3){Gal(α1-3)Gal(ß1-4)[Fuc(α1-3)]GlcNAc(ß1-6)}Gal(ß1-4)Glc (monosialyl monogalactosyl monofucosyl lacto-N-neohexaose), and Neu5Ac(α2-6)Gal(ß1-4)GlcNAc(ß1-3){Gal(α1-3)[Fuc(α1-2)]Gal(ß1-4)[Fuc(α1-3)]GlcNAc(ß1-6)}Gal(ß1-4)Glc (monosialyl monogalactosyl difucosyl lacto-N-neohexaose). A notable feature of some of these milk oligosaccharides is the presence of B-antigen (Gal(α1-3)[Fuc(α1-2)]Gal), α-Gal epitope (Gal(α1-3)Gal(ß1-4)Glc(NAc)) and Lewis x (Gal(ß1-4)[Fuc(α1-3)]GlcNAc) structures within oligosaccharides. By comparison to American black bear milk, cheetah milk had a much smaller array of oligosaccharides. Two cheetah milks contained Gal(α1-3)Gal(ß1-4)Glc (isoglobotriose), while another cheetah milk did not, but contained Gal(ß1-6)Gal(ß1-4)Glc (6'-galactosyllactose) and Gal(ß1-3)Gal(ß1-4)Glc (3'-galactosyllactose). Two cheetah milks contained Gal(ß1-4)GlcNAc(ß1-3)[Gal(ß1-4)GlcNAc(ß1-6)]Gal(ß1-4)Glc (lacto-N-neohexaose), and one cheetah milk contained Gal(ß1-4)Glc-3'-O-sulfate. Neu5Ac(α2-8)Neu5Ac(α2-3)Gal(ß1-4)Glc (disialyllactose) was the only sialyl oligosaccharide identified in cheetah milk. The heterogeneity of milk oligosaccharides was found between both species with respect of the presence/absence of B-antigen and Lewis x. The variety of milk oligosaccharides was much greater in the American black bear than in the cheetah. The ratio of milk oligosaccharides-to-lactose was lower in cheetah (1:1-1:2) than American black bear (21:1) which is likely a reflection of the requirement for a dietary supply of N-acetyl neuraminic acid (sialic acid), in altricial ursids compared to more precocial felids, given the role of these oligosaccharides in the synthesis of brain gangliosides and the polysialic chains on neural cell adhesion.


Asunto(s)
Acinonyx/metabolismo , Leche/química , Oligosacáridos/química , Ursidae/metabolismo , Animales , Oligosacáridos/análisis
2.
Glycoconj J ; 35(3): 275-286, 2018 06.
Artículo en Inglés | MEDLINE | ID: mdl-29644514

RESUMEN

In this study on milk saccharides of the raccoon (Procyonidae: Carnivora), free lactose was found to be a minor constituent among a variety of neutral and acidic oligosaccharides, which predominated over lactose. The milk oligosaccharides were isolated from the carbohydrate fractions of each of four samples of raccoon milk and their chemical structures determined by 1H-NMR and MALDI-TOF mass spectroscopies. The structures of the four neutral milk oligosaccharides were Fuc(α1-2)Gal(ß1-4)Glc (2'-fucosyllactose), Fuc(α1-2)Gal(ß1-4)GlcNAc(ß1-3)Gal(ß1-4)Glc (lacto-N-fucopentaose IV), Fuc(α1-2)Gal(ß1-4)GlcNAc(ß1-3)Gal(ß1-4)GlcNAc(ß1-3)Gal(ß1-4)Glc (fucosyl para lacto-N-neohexaose) and Fuc(α1-2)Gal(ß1-4)GlcNAc(ß1-3)[Fuc(α1-2)Gal(ß1-4)GlcNAc(ß1-6)]Gal(ß1-4)Glc (difucosyl lacto-N-neohexaose). No type I oligosaccharides, which contain Gal(ß1-3)GlcNAc units, were detected, but type 2 saccharides, which contain Gal(ß1-4)GlcNAc units were present. The monosaccharide compositions of two of the acidic oligosaccharides were [Neu5Ac]1[Hex]6[HexNAc]4[deoxy Hex]2, while those of another two were [Neu5Ac]1[Hex]8[HexNAc]6[deoxy Hex]3. These acidic oligosaccharides contained α(2-3) or α(2-6) linked Neu5Ac, non reducing α(1-2) linked Fuc, poly N-acetyllactosamine (Gal(ß1-4)GlcNAc) and reducing lactose.


Asunto(s)
Leche/química , Oligosacáridos/química , Animales , Conformación de Carbohidratos , Femenino , Mapaches
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