title: DNA bending at adenine . thymine tracts.
abstract: Intrinsic bending of DNA molecules results from local structural polymorphism in regions of homopolymeric dA . dT which are at least 4 base pairs long; the A . T tracts must be repeated in phase with the helix screw. Bending, in the direction of base-pair tilt rather than roll, occurs at the junctions between the A . T tract and adjacent B-DNA, with a larger angle at the 3' than at the 5' end of the A tract.
mesh_terms: D000225:Adenine; D001483:Base Sequence; D004247:DNA / Q000032:analysis*; D004591:Electrophoresis, Polyacrylamide Gel; D009690:Nucleic Acid Conformation; D011067:Poly dA-dT; D011110:Polymorphism, Genetic; D012091:Repetitive Sequences, Nucleic Acid; D013696:Temperature; D013941:Thymine
chemical_list: D011067:Poly dA-dT; D004247:DNA; D000225:Adenine; D013941:Thymine