Abstract:
:DNA bending is assumed to play a crucial role during recognition of the cAMP-responsive element (CRE) by transcription factors. However, diverging results have been obtained for the bending direction of the unbound double helix. The refined NMR structures present a bend directed toward the minor groove, while biochemical methods conclude that there is a bend toward the major groove. The present 10-ns molecular dynamics (MD) simulation of d(GAGATGACGTCATCTC)(2), which contains the octamer CRE in its center, was carried out with AMBER in explicit water and counterions. It shows that CRE is a flexible segment, although it is bent slightly toward the major groove (7 degrees -8 degrees ) on the average. The MD structure agrees with both the biochemical results and unrefined NMR data. The divergence with the NMR refined structures suggests an improper electrostatic parameterization in the refinement software. The malleability of the central CpG is certainly the major contribution to the curving of the whole CRE segment in both the unbound and bound states. Comparison with the crystal structure of CRE bound to GCN4 shows that the deformation induced by the protein is concentrated mainly on the CpG step, rendering the bound structure of CRE closer to the structure of the 12-0 tetradecanoylphorbol-beta-acetate-responsive element.
journal_name
Biophys Jjournal_title
Biophysical journalauthors
Derreumaux S,Fermandjian Sdoi
10.1016/S0006-3495(00)76324-7subject
Has Abstractpub_date
2000-08-01 00:00:00pages
656-69issue
2eissn
0006-3495issn
1542-0086pii
S0006-3495(00)76324-7journal_volume
79pub_type
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