330D

BASE-PAIRING SHIFT IN THE MAJOR GROOVE OF (CA)N TRACTS BY B-DNA CRYSTAL STRUCTURES

330D の概要

• エントリーDOI: 10.2210/pdb330d/pdb
• 分子名称: DNA (5'-D(*AP*CP*CP*GP*CP*CP*GP*GP*CP*GP*CP*C)-3'), DNA (5'-D(*GP*GP*CP*GP*CP*CP*GP*GP*CP*GP*GP*T)-3') (3 entities in total)
• 機能のキーワード: b-dna, double helix, dna
• タンパク質・核酸の鎖数: 2
• 化学式量合計: 7329.75

構造登録者

Timsit, Y.,Vilbois, E.,Moras, D. (登録日: 1997-04-29, 公開日: 1997-04-30, 最終更新日: 2024-04-03)

主引用文献

Timsit, Y.,Vilbois, E.,Moras, D.
Base-pairing shift in the major groove of (CA)n tracts by B-DNA crystal structures.
Nature, 354:167-170, 1991

PubMed Abstract: the crystal packing of the B-DNA dodecamer d(ACCG-GCGCCACA).d(TGTGGCGCCGGT) is characterized by the reciprocal fit of double helices with specific base-backbone interactions in the major groove. Cooling the crystals below -10 degrees C stabilizes a new conformational state with a long-range sequence-dependent one-step shift in the major-groove base pairing. The tilt of the bases leads to the disruption of the Watson-Crick pairing in the major groove and to the formation of interactions with the 5' neighbour of their complement. This alteration propagates along the helical axis over more than half a turn. As a result, the molecular structure is normal when seen from the minor groove side and mismatched in the major groove. Comparison with a parent isomorphous dodecamer structure corresponding to the codon 10-13 of the c-Ha-ras proto-oncogene show that this new structural feature is sequence dependent and clearly favoured by (CA)n tracts. As(CA)n tracts of DNA are involved both in recombination and in transcription, this new recognition pattern should be considered in the analysis of the various processes involving the reading of the genetic information.

PubMed: 1944598
DOI: 10.1038/354167a0

実験手法

X-RAY DIFFRACTION (2.7 Å)