scholarly journals High regularity of Z-DNA revealed by ultra high-resolution crystal structure at 0.55 ņ

2011 ◽  
Vol 39 (14) ◽  
pp. 6238-6248 ◽  
Author(s):  
Krzysztof Brzezinski ◽  
Anna Brzuszkiewicz ◽  
Miroslawa Dauter ◽  
Maciej Kubicki ◽  
Mariusz Jaskolski ◽  
...  
Keyword(s):  
Crystal Structure ◽  
High Resolution ◽  
High Regularity ◽  
Z Dna

scholarly journals High-resolution crystal structure of Z-DNA in complex with Cr3+ cations

2015 ◽  
Vol 20 (3) ◽  
pp. 595-602 ◽  
Author(s):  
Pawel Drozdzal ◽  
Miroslaw Gilski ◽  
Ryszard Kierzek ◽  
Lechoslaw Lomozik ◽  
Mariusz Jaskolski
Keyword(s):  
Crystal Structure ◽  
High Resolution ◽  
Z Dna

scholarly journals Crystal structure of Z-DNA in complex with the polyamine putrescine and potassium cations at ultra-high resolution

2021 ◽  
Vol 77 (3) ◽  
Author(s):  
Pawel Drozdzal ◽  
Miroslaw Gilski ◽  
Mariusz Jaskolski
Keyword(s):  
Crystal Structure ◽  
High Resolution ◽  
Hydrogen Bonds ◽  
Structural Disorder ◽  
Potassium Cation ◽  
Water Molecules ◽  
Dna Duplexes ◽  
Dna Backbone ◽  
Z Dna ◽  
Phosphate Groups

The X-ray crystal structure of the d(CGCGCG)2/putrescine(2+)/K+ complex has been determined at 0.60 Å resolution. Stereochemical restraints were used only for the putrescinium dication, and 23 bonds and 18 angles of the Z-DNA nucleotides with dual conformation. The N atoms of the putrescine(2+) dication form three direct hydrogen bonds with the N7_G atoms of three different Z-DNA molecules, plus three water-mediated hydrogen bonds with cytosine, guanine and phosphate acceptors. A unique potassium cation was also unambiguously identified in the structure, albeit at a ∼0.5 occupation site shared with a water molecule, providing the first example of such a complex with Z-DNA. The K+ cation has coordination number of eight and an irregular coordination sphere, formed by four water molecules and four O atoms from two phosphate groups of the Z-DNA, including ligands present at fractional occupancy. The structural disorder of the Z-DNA duplex is manifested by the presence of alternate conformations along the DNA backbone. Comparison of the position and interactions of putrescine(2+) in the present structure with other ultra-high-resolution structures of Z-DNA in complexes with Mn2+ and Zn2+ ions shows that the dicationic putrescinium moiety can effectively substitute these metal ions for stabilization of Z-type DNA duplexes. Furthermore, this comparison also suggests that the spermine(4+) tetracation has a higher affinity for Z-DNA than K+.

High resolution STEM imaging study on high Tc superconductor YBa2CuaO7-x

1988 ◽  
Vol 46 ◽  
pp. 882-883
Author(s):  
H.-J. Ou ◽  
J. M. Cowley
Keyword(s):  
Crystal Structure ◽  
High Resolution ◽  
Grain Boundary ◽  
Strong Field ◽  
Imaging Study ◽  
Structure Defects ◽  
High Tc ◽  
High Tc Superconductor ◽  
Diffraction Patterns ◽  
Lattice Planes

Using the dedicate VG-HB5 STEM microscope, the crystal structure of high Tc superconductor of YBa2Cu3O7-x has been studied via high resolution STEM (HRSTEM) imaging and nanobeam (∽3A) diffraction patterns. Figure 1(a) and 2(a) illustrate the HRSTEM image taken at 10' times magnification along [001] direction and [100] direction, respectively. In figure 1(a), a grain boundary with strong field contrast is seen between two crystal regions A and B. The grain boundary appears to be parallel to a (110) plane, although it is not possible to determine [100] and [001] axes as it is in other regions which contain twin planes [3]. Following the horizontal lattice lines, from left to right across the grain boundary, a lattice bending of ∽4° is noticed. Three extra lattice planes, indicated by arrows, were found to terminate at the grain boundary and form dislocations. It is believed that due to different chemical composition, such structure defects occur during crystal growth. No bending is observed along the vertical lattice lines.

Perovskite Solar Cells: Crystal Structure and Interface Architecture with High Resolution TEM Observations

2017 ◽  
Author(s):  
Satoshi Uchida ◽  
Tae Woong Kim ◽  
Ludmila Cojocaru ◽  
Takashi Kondo ◽  
Hiroshi Segawa
Keyword(s):  
Crystal Structure ◽  
Solar Cells ◽  
High Resolution ◽  
Perovskite Solar Cells ◽  
High Resolution Tem

Molecular and Crystal Structure of d(CGCGmo4CG): N4−Methoxy-cytosineguanine Base Pairs in Z-DNA

1990 ◽  
Vol 9 (3) ◽  
pp. 467-469 ◽  
Author(s):  
L. Van Meervelt ◽  
M. H. Moore ◽  
P. Kong Thoo Lin ◽  
D. M. Brown ◽  
O. Kennard
Keyword(s):  
Crystal Structure ◽  
Molecular And Crystal Structure ◽  
Base Pairs ◽  
Z Dna

scholarly journals High resolution crystal structure of the catalytic domain of MCR-1

2016 ◽  
Vol 6 (1) ◽  
Author(s):  
Guixing Ma ◽  
Yifan Zhu ◽  
Zhicheng Yu ◽  
Ashfaq Ahmad ◽  
Hongmin Zhang
Keyword(s):  
Crystal Structure ◽  
High Resolution ◽  
Catalytic Domain
Sign in / Sign up

Export Citation Format

Share Document