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  • 1
    Electronic Resource
    Electronic Resource
    The endogenous lectins of the chick blastoderm are present in association with an apolipoprotein in distinct organelles and in the extracellular matrix (1990)
    Springer
    Development genes and evolution 199 (1990), S. 295-306 
    Details
    ISSN: 1432-041X
    Keywords: Lectin ; Apolipoprotein ; Embryo ; Blastoderm
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Affinity purified preparations of the galactose-binding lectin from gastrulating chick blastoderms consist of three main polypeptides. Two of these have been identified as the 14 kD and 16 kD galactose-binding lectins. A third one migrates in SDS-PAGE gels with a relative molecular weight of 6,500±500 and has been identified as an apolipoprotein (Apo) of plasma very low density lipoproteins, Apo-VLDL-II. We have studied the localization of these polypeptides using immunofluorescence and ultrastructural immunocytochemistry with peroxidase and protein-A gold. The 14 kD lectin occurs in the intracellular yolk where it is mainly present within the electron lucent component. The 16 kD is also present in the intracellular yolk platelets, but tends to predominate in the electron-dense component. In addition, the 16 kD lectin is also present in pleiomorphic yolk-associated organelles and in the extracellular matrix. Apo-VLDL-II is also localized in the electron-lucent component of the yolk platelet and in the extracellular matrix. Our results suggest that the lectin(s) are associated with Apo-VLDL-II in the yolk platelet, and may subsequently become externalized.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01709508
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  • 2
    Electronic Resource
    Electronic Resource
    Endogenous β-d-galactoside binding lectin during the expansion of the yolk sac in the developing chick embryo (1987)
    Springer
    Development genes and evolution 196 (1987), S. 176-184 
    Details
    ISSN: 1432-041X
    Keywords: Lectin ; Galactose ; Yolk sac ; Chick embryo
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary A lectin with an affinity for β-d-galactoside-containing saccharides is present in the developing yolk sac from the chick embryo at stages from 2 to 7 days of incubation. This activity is present in the area vitellina (less differentiated) and the area vasculosa (more differentiated). In both areas, lectin activity increases significantly during the spreading of the yolk sac up to 5 days of incubation. At all of the stages studied lectin activity was significantly higher in the area vasculosa, as compared to the area vitellina. Lectins were purified by affinity chromatography and examined by SDS-PAGE. Under reducing conditions two components are evident. A more prominent band of subunit molecular weight of 14,200±100 for the area vitellina and 13,700±300 for the area vasculosa and a second band with molecular weight of about 68,000±700 and 68,000±1,200 for the area vitellina and area vasculosa respectively, were observed. The β-d-galactoside-binding lectin appears to be similar if not identical to that of the early chick blastoderm.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00376312
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    Paper (German National Licenses)
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