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  • 1
    ISSN: 0948-5023
    Keywords: Keywords: P53-DNA interface ; Mutation hotspots ; VRML ; 1D + 3D structure analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The inactivation of the p53 tumor suppressor function by single missense point mutations is found in almost half of human tumors. Most p53 mutation hotspots are at the DNA binding interface, shown in the three-dimensional (3D) structure of a p53-DNA complex crystallized by Pavletich and coworkers [1]. We have investigated the influence of mutations on the predicted specific DNA binding capacities of p53 by using molecular modeling to compare biochemical properties of wild type and mutated p53 complexed to DNA. Changes in local properties e.g. electrostatic potential or hydrophilic/lipophilic properties, combined with the steric interferences, lead to a loss of specific binding and presumably disables the tumor suppressor function. The 3D-structures combined with molecular biochemical properties of the wild type and the mutated p53-DNA complex can be transferred by the use of the Virtual Reality Modeling Language (VRML). Special tools e.g. ′space buttons′ allow users the interactive exploration of structures, properties, and additional information via internet.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 281 (1976), S. 379-380 
    ISSN: 1618-2650
    Keywords: Best. von Schwefel neben Schwefelorganoverbindungen ; Chromatographie, Säulen ; Extraktion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 280 (1976), S. 293-297 
    ISSN: 1618-2650
    Keywords: Trennung von Polysulfiden, aliphat. ; Chromatographie, Säulen ; HPLC
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Aliphatische Di- und Polysulfide lassen sich im reverse-phase-Verfahren an einer chemisch gebundenen Octadecylphase (Micro-Pak-CH) mit MeOH-H2O als Eluens sauber trennen. Die qualitative Zuordnung der Peaks wird durch folgende Effekte vereinfacht: 1. log k′ nimmt bei konstanter S-Zahl linear mit der C-Zahl zu; 2. log k′ nimmt bei konstantem Alkylrest linear mit der S-Zahl zu; 3. log k′ fällt linear mit zunehmendem Gehalt des Eluens an MeOH. Bei Auswahl eines geeigneten Eluensgradienten können homologe Reihen wie R 2 S 2 mit R = Methyl bis R = Hexyl oder R 2 S x mit x = 2−7 mit einer Auflösung Res ∼ 2 zwischen allen Komponenten getrennt werden. Die Polysulfide werden bei diesen Trennungen nicht verändert.
    Notes: Abstract Aliphatic di- and polysulphides were separated by reverse-phase bonded-phase liquid chromatography. Chemically bonded octadecyl groups formed the stationary phase, mixtures of water and methanol were the mobile phase. For the qualitative analysis of polysulphide mixtures the following findings are important: 1. With constant S-number log k′ increases linearly with the C-number. 2. With constant hydrocarbon group log k′ increases linearly with the S-number. 3. log k′ decreases linearly with increasing methanol percentage in the eluent. With proper choice of gradient homologous series like R 2 S 2 with R = methyl to R = hexyl or R 2Sx with x = 2 ... 7 could be separated with a resolution of about 2 between all components. The polysulphides are not altered during these separations.
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