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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Proteins in intracellular simian virus 40 nucleoportein complexes: comparison with simian virus 40 core proteins.

Intracellular nucleoprotein complexes containing SV40 supercoiled DNA were purified from cell lysates by chromatography on hydroxyapatite columns followed by velocity sedimentation through sucrose gradients. The major protein components from purified complexes were identified as histone-like proteins. When analyzed by electrophoresis in sodium dodecyl sulfate-polyacrylamide gels, complex proteins comigrated with viral core polypeptides VP4, VP5, VP6, and VP7. (3H) tryptophan was not detected in polypeptides from intracellular complexes or in the histone components from purified SV40 virus. However, a large amount of (3H) tryptophan was found in the viral polypeptide VP3 relative to that incorporated into the capsid polypeptides VP1 and VP2. Intracellular complexes contain 30 to 40% more protein than viral cores prepared by alkali dissociation of intact virus, but when complexes were exposed to the same alkaline conditions, protein also was removed from complexes and they subsequently co-sedimented with and had the same buoyant density as viral cores. The composition and physical similarities of nucleoprotein complex and viral cores indicate that complexes may have a role in the assembly of virions.[1]


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