RESUMO
The X-ray crystal structures of a decamer sequence d(CGCGTACGCG)2 and a tetradecamer sequence d(CGCGCGTACGCGCG)2 are presented here. Both sequences are alternating pyrimidine-purine repeat sequences and they form disordered, pseudo-continuous left handed Z-type helices. They demonstrate interesting variants of the 'bundles of columns of helices' mode of packing.
Assuntos
Cristalização , DNA/química , Sequência de Bases , Cristalografia por Raios X/métodos , Bases de Dados de Ácidos Nucleicos , Modelos Moleculares , Conformação de Ácido Nucleico , Purinas/química , Pirimidinas/químicaRESUMO
We present here a comparison of three different X-ray crystal structures of DNA tetradecamer sequence d(CCCGGGTACCCGGG)2 all at about 1.7 Å resolution. The sequence was designed as an attempt to form a DNA four-way junction with A-type helical arms. However, in the presence of zinc, magnesium, and in the absence of any metal ion, it does not take up the junction structure, but forms an A-type double helix. This allowed us to study possible conformational changes in the double helix due to the presence of metal ions. Upon addition of the zinc ion, there is a change in the space group from P41212 to P41. The overall conformation of the duplex remains the same. There are small changes in the interaction of the metal ions with the DNA. In the zinc-bound structure, there are two zinc ions that show direct interaction with the N7 atoms of terminal G13 bases at either end of the molecule. There are small changes in the interhelical contacts. The consequence of these differences is to break some of the symmetry and change the space group.
