title: Chain flexibility and hydrodynamics of the B and Z forms of poly(dG-dC).poly(dG-dC).
abstract: The solution properties of the B and Z forms of poly(dG-dC).poly(dG-dC) have been measured by static and dynamic laser light scattering. The radius of gyration, persistence length, translational and segmental diffusion coefficients, and the Rouse-Zimm parameters have been evaluated. The persistence length of the Z form determined at 3 M NaCl is about 200 nm compared to 84 and 61 nm respectively for the B forms of poly(dG-dC).poly(dG-dC), and calf thymus DNA, both determined at 0.1 M NaCl. The data on persistence length, diffusion coefficients and the Rouse-Zimm parameters indicate a large increase in the chain stiffness of Z DNA compared to the B form. These results are opposite to the ionic strength effects on random sequence native DNAs, for which the flexibility increases with ionic strength and levels off at about 1 M NaCl.
mesh_terms: D000818:Animals; D002417:Cattle; D004247:DNA; D008970:Molecular Weight; D009690:Nucleic Acid Conformation; D009994:Osmolar Concentration; D011089:Polydeoxyribonucleotides; D013329:Structure-Activity Relationship; D013950:Thymus Gland
chemical_list: D011089:Polydeoxyribonucleotides; C019530:poly(dC-dG); D004247:DNA