Figure 23.3.4.6

Dickerson, R. E.

doi:10.1107/97809553602060000716

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

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International Tables for Crystallography (2006). Vol. F. ch. 23.3, p. 606 | 1 | 2 |

Figure 23.3.4.6

R. E. Dickerson^a ^*

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

Figure 23.3.4.6

Roll-angle plots for sequence-specific DNA–protein complexes with lacI (top) and purR (bottom). In each case, bending occurs via localized roll at a C-G step. Other steps of the sequence have random rolls of ca 10° or less. Note that, as with IHF, A-tracts are especially straight and unbent. Dashed lines in the lacI plot demonstrate the unimportance of tilt in production of helix bending.