International
Tables for
Crystallography
Volume F
Crystallography of biological macromolecules
Edited by M. G. Rossmann and E. Arnold

© International Union of Crystallography 2006
International Tables for Crystallography (2006). Vol. F. ch. 23.3, p. 590   | 1 | 2 |

Figure 23.3.1.3 

R. E. Dickersona*

a Molecular Biology Institute, University of California, Los Angeles, Los Angeles, CA 90095–1570, USA
Correspondence e-mail: red@mbi.ucla.edu

[Figure 23.3.1.3]
Figure 23.3.1.3

Infinite B-DNA helix, generated in a similar manner to Fig. 23.3.1.2[link] from the central ten base pairs of the dodecamer C-G-C-G-A-A-T-T-C-G-C-G (B1–B5). Note that the minor groove is narrow in the AT region facing the viewer at the centre, but appreciably wider in the GC regions on the back side of the helix at top and bottom. Propeller twisting, or deviations of bases from coplanarity within one pair, is one sequence-dependent aspect of DNA that was not suspected from the averaged structures obtained from fibres. (From Dickerson, 1983[link].) Reprinted courtesy of the estate of Irving Geis. Rights owned by Howard Hughes Medical Institute.