title: Counterions which favour the C form of DNA.
abstract: Recently the relationship between the B and C forms of DNA has been questioned. We have found some amino acids and related amines which form complexes with DNA and favour the C form. We have studied such complexes by X-ray diffraction. With some of these counterions the transition between the B and C forms occurs smoothly, whereas in other cases there is a discontinuous transition. We conclude that the C form is a well-defined variant of the B form favoured by some counterions under low humidity conditions.
mesh_terms: D000596:Amino Acids; D000818:Animals; D002417:Cattle; D004247:DNA; D009690:Nucleic Acid Conformation; D013329:Structure-Activity Relationship; D013950:Thymus Gland; D014961:X-Ray Diffraction
chemical_list: D000596:Amino Acids; D004247:DNA