[New packing of B-DNA in crystals].
Two crystal forms of the self-complementary tetramer GpGpCpC have been obtained by phase diagram technique: P6(2)22/P6(4)22. a = b = 67.7 A, c = 105.6 A and P3(2)12/P3(1)12, a = b = 116.9 A. c = 116.4 A. Both crystals form diffract at least up to 3.2 A. Diffraction patterns of both crystal forms have strongest base-stacking reflections corresponding to the Bragg spacing 3.38 A which is typical for B-DNA. Moreover the self-rotation function of the first crystal form shows regular located two-fold pseudo-axes periodicity of which also indicates that this is B-conformation. The same conclusion can be reached on the basis of the crystal packing of the duplexes in the unit cell. It should be emphasized that this is a new example of B-DNA crystal packing.
Minasov
G A
GA
Tereshko
V A
VA
Chernov
B K
BK
Malinina
L V
LV
D003460:Crystallization; D004247:DNA / Q000737:chemistry*; D009690:Nucleic Acid Conformation; D014961:X-Ray Diffraction
D004247:DNA
Novaia upakovka B-DNK v kristallakh.