scholarly journals Visualisation of a 2′-5′ parallel stranded double helix at atomic resolution: crystal structure of cytidylyl-2′,5′-adenosine

1991 ◽  
Vol 19 (2) ◽  
pp. 379-384 ◽  
Author(s):  
R. Krishnan ◽  
T.P. Seshadri ◽  
M.A. Viswamitra
Keyword(s):  
Crystal Structure ◽  
Double Helix ◽  
Atomic Resolution

scholarly journals Preferred orientation in an angled intercalation site of a chloro-substituted Λ -[Ru(TAP) 2 (dppz)] 2+ complex bound to d(TCGGCGCCGA) 2

2013 ◽  
Vol 371 (1995) ◽  
pp. 20120525 ◽  
Author(s):  
James P. Hall ◽  
Hanna Beer ◽  
Katrin Buchner ◽  
David J. Cardin ◽  
Christine J. Cardin
Keyword(s):  
Crystal Structure ◽  
Ruthenium Complex ◽  
Double Helix ◽  
Minor Groove ◽  
Preferred Orientation ◽  
Atomic Resolution ◽  
Oligonucleotide Duplex ◽  
First Time

The crystal structure of the ruthenium DNA ‘light-switch’ complex Λ -[Ru(TAP) 2 (11-Cl-dppz)] 2+ (TAP=tetraazaphenanthrene, dppz=dipyrido[3,2- a ′:2′,3′- c ]phenazine) bound to the oligonucleotide duplex d(TCGGCGCCGA) 2 is reported. The synthesis of the racemic ruthenium complex is described for the first time, and the racemate was used in this study. The crystal structure, at atomic resolution (1.0 Å), shows one ligand as a wedge in the minor groove, resulting in the 51 ° kinking of the double helix, as with the parent Λ -[Ru(TAP) 2 (dppz)] 2+ . Each complex binds to one duplex by intercalation of the dppz ligand and also by semi-intercalation of one of the orthogonal TAP ligands into a second symmetrically equivalent duplex. The 11-chloro substituent binds with the major component (66%) oriented with the 11-chloro substituent on the purine side of the terminal step of the duplex.

scholarly journals The molecular structure of the left-handed Z-DNA double helix at 1.0-Å atomic resolution

1989 ◽  
Vol 264 (14) ◽  
pp. 7921-7935
Author(s):  
R V Gessner ◽  
C A Frederick ◽  
G J Quigley ◽  
A Rich ◽  
A H J Wang
Keyword(s):  
Molecular Structure ◽  
Double Helix ◽  
Atomic Resolution ◽  
Left Handed ◽  
Z Dna ◽  
Dna Double Helix

X-ray Crystal Structure of a Metalled Double-Helix Generated by Infinite and Consecutive C*-AgI -C* (C*:N1 -Hexylcytosine) Base Pairs through Argentophilic and Hydrogen Bond Interactions

2017 ◽  
Vol 23 (9) ◽  
pp. 2103-2108 ◽  
Author(s):  
Angel Terrón ◽  
Blas Moreno-Vachiano ◽  
Antonio Bauzá ◽  
Angel García-Raso ◽  
Juan Jesús Fiol ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Hydrogen Bond ◽  
Double Helix ◽  
Base Pairs ◽  
X Ray ◽  
Hydrogen Bond Interactions

scholarly journals Aza-proline effectively mimics l-proline stereochemistry in triple helical collagen

2019 ◽  
Vol 10 (29) ◽  
pp. 6979-6983 ◽  
Author(s):  
Alexander J. Kasznel ◽  
Trevor Harris ◽  
Nicholas J. Porter ◽  
Yitao Zhang ◽  
David M. Chenoweth
Keyword(s):  
Crystal Structure ◽  
Computational Analysis ◽  
Atomic Resolution

Chenoweth and co-workers provide an atomic resolution crystal structure and computational analysis illustrating that aza-proline mimics l-proline stereochemistry in collagen.

Atomic resolution crystal structure of squid ganglion DFPase

2002 ◽  
Vol 58 (10) ◽  
pp. 1757-1759 ◽  
Author(s):  
Juergen Koepke ◽  
Eileen I. Scharff ◽  
Christian Lücke ◽  
Heinz Rüterjans ◽  
Günter Fritzsch
Keyword(s):  
Crystal Structure ◽  
Atomic Resolution

scholarly journals Crystal structure of d(CCGGGGTACCCCGG)2at 1.4 Å resolution

2017 ◽  
Vol 73 (5) ◽  
pp. 259-265
Author(s):  
Selvam Karthik ◽  
Arunachalam Thirugnanasambandam ◽  
Pradeep Kumar Mandal ◽  
Namasivayam Gautham
Keyword(s):  
Crystal Structure ◽  
Metal Ion ◽  
Double Helix ◽  
Barium Chloride ◽  
Base Pairs ◽  
X Ray ◽  
Density Map ◽  
Solvent Molecules ◽  
Electron Density Map ◽  
Phosphate Groups

The X-ray crystal structure of the DNA tetradecamer sequence d(CCGGGGTACCCCGG)2is reported at 1.4 Å resolution in the tetragonal space groupP41212. The sequence was designed to fold as a four-way junction. However, it forms an A-type double helix in the presence of barium chloride. The metal ion could not be identified in the electron-density map. The crystallographic asymmetric unit consists of one A-type double helix with 12 base pairs per turn, in contrast to 11 base pairs per turn for canonical A-DNA. A large number of solvent molecules have been identified in both the grooves of the duplex and around the backbone phosphate groups.

Direct observation of incommensurate structure in Mo3Si

2016 ◽  
Vol 72 (6) ◽  
pp. 660-666 ◽  
Author(s):  
Ahmet Gulec ◽  
Xiaoxiang Yu ◽  
Matthew Taylor ◽  
John H. Perepezko ◽  
Laurence Marks
Keyword(s):  
Crystal Structure ◽  
Density Functional Theory ◽  
Atom Probe Tomography ◽  
Density Functional ◽  
Density Functional Theory Calculations ◽  
Atom Probe ◽  
Atomic Resolution ◽  
Contrast Imaging ◽  
Functional Theory ◽  
Incommensurate Structure

Z-contrast imaging, electron diffraction, atom-probe tomography (APT) and density functional theory calculations were used to study the crystal structure of the Mo3Si phase which was previously reported to have an A15 crystal structure. The results showed that Mo3Si has an incommensurate crystal structure with a non-cubic unit cell. The small off-stoichiometry in composition of the sample which was revealed by APT and atomic resolutionZ-contrast imaging suggested that site substitution caused the development of split atomic positions, disorder and vacancies.

Atomic Resolution Investigations of Phase Transformation from TaN to CrTaN in a Steel Matrix

2012 ◽  
Vol 706-709 ◽  
pp. 823-828
Author(s):  
Hilmar Kjartansson Danielsen ◽  
John Hald
Keyword(s):  
Crystal Structure ◽  
Creep Strength ◽  
Power Plants ◽  
Atomic Resolution ◽  
Double Layers ◽  
Steel Matrix ◽  
Phase Precipitation ◽  
Direct Transformation ◽  
Term Creep

In development of 12%Cr high temperature steels used for fossil fired power plants, the precipitation of large Z-phase particles, CrMN, has been identified as a major problem since they replace small and finely distributed MN particles. This causes a premature breakdown in the long-term creep strength of the steel. The Cr content promotes Z-phase precipitation, making MN strengthening of these materials unfeasible, since 12%Cr is necessary for oxidation resistance. The authors have suggested an acceleration of Z-phase precipitation to obtain a fine and stable distribution of CrMN instead of MN, thus preserving long-term creep strength. This can be done by alloying with Ta instead of Nb and V. Recent investigations have indicated a direct transformation of MN into CrMN to take place, not the traditional nucleation/dissolution process. In this paper atomic resolution microscopy shows how Cr atoms diffuse from the steel matrix into TaN precipitates and physically transform them into CrTaN. The crystal structure of the precipitates changes from that of a typical MN NaCl type crystal structure to a Z-phase crystal structure with alternating double layers of Cr and TaN. Since there is a large contrast between heavy Ta atoms and light Cr atoms, the ordering of the Cr layers inside the TaN particles can clearly be observed.

Double Helix at Atomic Resolution

Nature ◽  
1973 ◽  
Vol 243 (5403) ◽  
pp. 150-154 ◽  
Author(s):  
JOHN M. ROSENBERG ◽  
NADRIAN C. SEEMAN ◽  
JUNG JA PARK KIM ◽  
F. L. SUDDATH ◽  
HUGH B. NICHOLAS ◽  
...  
Keyword(s):  
Double Helix ◽  
Atomic Resolution
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