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  • 1
    Digitale Medien
    Digitale Medien
    The Hydrophobic Core Sequence Modulates the Neurotoxic and Secondary Structure Properties of the Prion Peptide 106-126 (1999)
    Oxford UK : Blackwell Science Ltd.
    Journal of neurochemistry 73 (1999), S. 0 
    Details
    ISSN: 1471-4159
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: Abstract : The neurodegeneration seen in spongiform encephalopathies is believed to be mediated by protease-resistant forms of the prion protein (PrP). A peptide encompassing residues 106-126 of human PrP has been shown to be neurotoxic in vitro. The neurotoxicity of PrP 106-126 appears to be dependent upon its adoption of an aggregated fibril structure. To examine the role of the hydrophobic core, AGAAAAGA, on PrP106-126 toxicity, we performed structure-activity analyses by substituting two or more hydrophobic residues for the hydrophilic serine residue to decrease its hydrophobicity. A peptide with a deleted alanine was also synthesized. We found all the peptides except the deletion mutant were no longer toxic on mouse cerebellar neuronal cultures. Circular dichroism analysis showed that the nontoxic PrP peptides had a marked decrease in β-sheet structure. In addition, the mutants had alterations in aggregability as measured by turbidity, Congo red binding, and fibril staining using electron microscopy. These data show that the hydrophobic core sequence is important for PrP106-126 toxicity probably by influencing its assembly into a neurotoxic structure. The hydrophobic sequence may similarly affect aggregation and toxicity observed in prion diseases.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1046/j.1471-4159.1999.0731557.x
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  • 2
    Digitale Medien
    Digitale Medien
    Prion protein glycosylation (2005)
    Oxford, UK : Blackwell Science Ltd
    Journal of neurochemistry 93 (2005), S. 0 
    Details
    ISSN: 1471-4159
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: The transmissible spongiform encephalopathies (TSE), or prion diseases are a group of transmissible neurodegenerative disorders of humans and animals. Although the infectious agent (the ‘prion’) has not yet been formally defined at the molecular level, much evidence exists to suggest that the major or sole component is an abnormal isoform of the host encoded prion protein (PrP). Different strains or isolates of the infectious agent exist, which exhibit characteristic disease phenotypes when transmitted to susceptible animals. In the absence of a nucleic acid genome it has been hard to accommodate the existence of TSE strains within the protein-only model of prion replication. Recent work examining the conformation and glycosylation patterns of disease-associated PrP has shown that these post-translational modifications show strain-specific properties and contribute to the molecular basis of TSE strain variation. This article will review the role of glycosylation in the susceptibility of cellular PrP to conversion to the disease-associated conformation and the role of glycosylation as a marker of TSE strain type.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1471-4159.2005.03104.x
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  • 3
    Digitale Medien
    Digitale Medien
    Continuous growth and differentiation of human myeloid leukaemic cells in suspension culture (1977)
    [s.l.] : Nature Publishing Group
    Nature 270 (1977), S. 347-349 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] Fig. 1 Initial growth of HL-60 leukaemic leukocytes in suspension culture. After seeding the fresh peripheral blood leukocytes at 2.5 x 105 cells per ml, weekly*haemocytometer counts were done on aliquots of cell suspensions grown in the presence or absence of conditioned media derived from ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/270347a0
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  • 4
    Digitale Medien
    Digitale Medien
    The synthesis and spectroscopic analysis of the neurotoxic prion peptide 106–126: Comparative use of manual Boc and Fmoc chemistry (1999)
    Springer
    International journal of peptide research and therapeutics 6 (1999), S. 129-134 
    Details
    ISSN: 1573-3904
    Schlagwort(e): amyloid ; circular dichroism ; ‘difficult sequence’ ; in situ neutralisation ; N-(2-hydroxy-4-methoxybenzyl) ; tetramethylfluoroformamidinium hexafluorophosphate
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Summary A peptide corresponding to residues 106–126 of the human prion protein (PrP) possesses the neurotoxic and amyloidogenic properties of the infectious form of the parental protein. This peptide is now identified as a ‘difficult sequence’ and synthesis using conventional manual Fmoc chemistry was unsuccessful with acylation terminating at a central core of hydrophobic amino acids. The use of tetramethylfluoroformamidinium hexafluorophosphate and 1-methyl-2-pyrrolidone as anti-aggregatory agents in the coupling steps improved the synthesis but still resulted in an incomplete peptide. The incorporation ofN-(2-hydroxy-4-methoxybenzyl)protection at glycine residues 119 and 124 enabled synthesis of the full length peptide in low yield. Synthesis using Boc chemistry within situ neutralisation gave the full length peptide in high yield.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02443627
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  • 5
    Digitale Medien
    Digitale Medien
    The synthesis and spectroscopic analysis of the neurotoxic prion peptide 106-126: Comparative use of manual Boc and Fmoc chemistry (1999)
    Springer
    International journal of peptide research and therapeutics 6 (1999), S. 129-134 
    Details
    ISSN: 1573-3904
    Schlagwort(e): amyloid ; circular dichroism ; 'difficult sequence' ; in situ neutralisation ; N-(2-hydroxy-4-methoxybenzyl) ; tetramethylfluoroformamidinium hexafluorophosphate
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract A peptide corresponding to residues 106-126 of the human prion protein (PrP) possesses the neurotoxic and amyloidogenic properties of the infectious form of the parental protein. This peptide is now identified as a 'difficult sequence' and synthesis using conventional manual Fmoc chemistry was unsuccessful with acylation terminating at a central core of hydrophobic amino acids. The use of tetramethylfluoroformamidinium hexafluorophosphate and 1-methyl-2- pyrrolidone as anti-aggregatory agents in the coupling steps improved the synthesis but still resulted in an incomplete peptide. The incorporation of N-(2-hydroxy-4-methoxybenzyl) protection at glycine residues 119 and 124 enabled synthesis of the full length peptide in low yield. Synthesis using Boc chemistry with in situ neutralisation gave the full length peptide in high yield.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1008808607811
    Standort Signatur Einschränkungen Verfügbarkeit
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