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. 1978 Jan;75(1):122–126. doi: 10.1073/pnas.75.1.122

Membrane-bound neuraminidase from calf brain: regulation of oligosialoganglioside degradation by membrane fluidity and membrane components.

K Sandhoff, B Pallmann
PMCID: PMC411196  PMID: 272627

Abstract

The degradation of lipophilic ganglioside GD1a and hydrophilic sialyllactitol by membrane-bound neuraminidase (EC 3.2.1.18) from calf brain has been studied at substrate concentrations of 0.1 mM. Ganglioside GD1a taken up by cell membranes is hydrolyzed faster membrane-bound neuraminidase than are water-soluble substrates of the enzyme, sialyllactitol and des-GD1a. Availability and enzymic breakdown of the disialoganglioside are enhanced by general anesthetics such as N2O or halothane whereas the degradation of the hydrophilic substrate silayllactitol is not affected or even is decreased by these agents. General anesthetics lower the microviscosity of membranes as indicated by studies of fluorescence depolarization with the indicator 1,6-diphenylhexatriene. Increased fluidity can result in higher lateral diffusion of ganglioside GD1a, thus increasing its chances of presentation to, and interaction with, membrane-bound neuraminidase. Lipophilic derivatives of the disialoganglioside, gangliosides GM1 and GM2 and gangliotriaosylceramide GA2, are strong inhibitors of the ganglioside degradation whereas water-soluble derivatives des-GM1, des-GM2, N-acetylneuraminic acid, and sialyllactose are not. A model is presented that suggests that the activity of membrane-bound neuraminidase on gangliosides of brain membranes is regulated by the viscosity of these membranes and their monosialoganglioside content.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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