Xem 1-11 trên 11 kết quả Ganglioside
  • Gangliosides are sialic acid-containing glycosphingolipids present on mam-malian plasma membranes, where they participate in cell-surface events such as modulation of growth factor receptors and cell-to-cell and cell-to-matrix interactions. Antibodies to gangliosides have been associated with a wide range of clinically identifiable acute and chronic neuropathy syn-dromes.

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  • We analyzed the role of gangliosides in the association of the ErbB2 recep-tor tyrosine-kinase (RTK) with lipid rafts in mammary epithelial HC11 cells. Scanning confocal microscopy experiments revealed a strict ErbB2– GM3 colocalization in wild-type cells. In addition, analysis of membrane fractions obtained using a linear sucrose gradient showed that ErbB2, epi-

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  • The botulinum neurotoxins (BoNTs) are the most potent protein toxins for humans. There are seven serotypes of BoNTs (A–G), based on a lack of cross-antiserum neutralization. The BoNT⁄C and BoNT⁄D serotypes include mosaic toxins that are organized as D–C and C–D toxins.

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  • Gangliosides are glycosphingolipids mainly present at the outer leaflet of the plasma membrane of eukaryotic cells, where they participate in recogni-tion and signalling activities. The synthesis of gangliosides is carried out in the lumen of the Golgi apparatus by a complex system of glycosyltrans-ferases.

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  • The GM2-activator protein (GM2AP) is an essential cofactor for the degradation of ganglioside GM2 by lyso-somal b-hexosaminidase A. It mediates the interaction between the water-soluble exohydrolase and its membrane-bound substrate at the lipid–water interphase. Inherited defects in the gene encoding this glycoprotein result ina fatal neurological storage disorder, the AB variant of GM2-gangliosidosis. To elucidate the mode of action of this gly-coprotein cofactor, we synthesized the two photoaffinity labels [ 14 C]C3 -TPD-GM2 and [ 14 C]C7 -TPD-GM2. ...

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  • Gangliosideshavebeen found toreside inglycosphingolipid-enriched microdomains (GEM) of the plasma membrane and to be involved in the regulation of epidermal growth factor receptor (EGFr or ErbB1) activity.To gain further insight into the mechanisms involved in EGFr modulation by gangliosides, we investigated the distribution of EGFr family members in the plasma membrane of CHO-K1 cells, which were genetically modified to express different gan-glioside molecules or depleted of glycolipids.

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  • Numerous virus–target cell interactions have been described, and it is now clear that different viruses can use similar host-cell receptors for entry. The list of certain and likely host receptors for viral pathogens is long. Among the host membrane components that can serve as receptors for viruses are sialic acids, gangliosides, glycosaminoglycans, integrins and other members of the immunoglobulin superfamily, histocompatibility antigens, and regulators and receptors for complement components.

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  • The GM2-activator protein (GM2AP) is an essential cofactor for the lyso-somal degradation of ganglioside GM2 by b-hexosaminidase A (HexA). It mediates the interaction between the water-soluble exohydrolase and its membrane-embedded glycolipid substrate at the lipid–water interface. Functional deficiencies in this protein result in a fatal neurological storage disorder, the AB variant of GM2 gangliosidosis.

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  • We have investigated the conformational changes of New-castle disease virus (NDV) glycoproteins in response to receptor binding, using 1,1-bis(4-anilino)naphthalene-5,5-disulfonic acid (bis-ANS) as a hydrophobicity-sensitive probe. Temperature- and pH-dependent conformational changes were detected in the presence of free bovine gan-gliosides. The fluorescence of bis-ANS was maximal at pH 5.

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  • Prosaposin is a neurotrophic factor that has been demonstrated to mediate trophic signalling events in different cell types; it distributes to surface membranes of neural cells and also exists as a secreted protein in different body fluids. Prosaposin was demonstrated to form tightly bound complexes with a variety of gangliosides, and a functional role has been suggested for ganglioside–prosaposin complexes.

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  • Campylobacter jejuniinfections are one of the leading causes of human gastroenteritis and are suspected of being a pre-cursor to Guillain–Barre´ and Miller–Fisher syndromes. Recently, the complete genome sequence ofC. jejuniNCTC 11168wasdescribed. In this study, themolecular structureof the lipooligosaccharide and capsular polysaccharide of C. jejuniNCTC 11168 was investigated. The lipooligosac-charide was shown to exhibit carbohydrate structures anal-ogous to the GM1a and GM2 carbohydrate epitopes of human gangliosides (shown below)...

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