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• W2067224879 abstract "Nucleoprotein complexes (NPCs) containing viral DNA and cellular histones except H 1 can be isolated from permissive cells infected with SV 40 [ 11 or polyoma virus [2]. Similar complexes can be obtained by mild dissociation of SV 40 or polyoma virions [3,4]. Electron microscopic studies of these complexes showed the presence of 2 1 * 2 v bodies or nucleosomes interconnected by naked DNA filaments [5,6]. This beaded structure is very similar to that of cellular chromatin [7,8]. The purification of viral NPCs, essentially limited to sucrose density gradients, is insufficient. Buoyant density centrifugations of irreversibly fixed NPCs have been described [91 l] , but the fixation process might introduce artifacts, and the material so purified is of little use for further biochemical studies. Metrizamide, a new density gradient medium [ 121, was recently used for the purification of chromatin in the absence of aldehyde fixation [ 131 , for the isolation of reconstituted DNA-histone complexes [ 141, for the purification of ribonucleoprotein particles [ 151, and for biochemical studies on polyoma NPCs [16]. We have isolated SV 40 nucleoprotein complexes by sedimentation on sucrose gradients, and further purified them by isopycnic centrifugation in metrizamide gradients. Detailed electron microscopic studies of SV 40 NPCs show that although the beaded circular structure is generally well preserved" @default.
• W2067224879 created "2016-06-24" @default.
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• W2067224879 date "1975-12-15" @default.
• W2067224879 modified "2023-09-27" @default.
• W2067224879 title "SV 40 Nucleoprotein complexes: Structural modifications after isopycnic centrifugation in metrizamide gradients" @default.
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• W2067224879 doi "https://doi.org/10.1016/0014-5793(75)80751-4" @default.
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