scholarly journals Crystal structure of the alternative oxidases: New insights into the catalytic cycle

2012 ◽  
Vol 1817 ◽  
pp. S102-S103 ◽  
Author(s):  
T. Shiba ◽  
Y. Kido ◽  
K. Sakamoto ◽  
D.K. Inaoka ◽  
E. Oluwadare Balogun ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Catalytic Cycle

scholarly journals Crystal Structure of Reduced and of Oxidized Peroxiredoxin IV Enzyme Reveals a Stable Oxidized Decamer and a Non-disulfide-bonded Intermediate in the Catalytic Cycle

2011 ◽  
Vol 286 (49) ◽  
pp. 42257-42266 ◽  
Author(s):  
Zhenbo Cao ◽  
Timothy J. Tavender ◽  
Aleksander W. Roszak ◽  
Richard J. Cogdell ◽  
Neil J. Bulleid
Keyword(s):  
Crystal Structure ◽  
Catalytic Cycle

Isolation and Crystal Structure of the Proposed Low-Valent Active Species in the H2Activation Catalytic Cycle

2013 ◽  
Vol 2013 (22-23) ◽  
pp. 3978-3986 ◽  
Author(s):  
Daisuke Inoki ◽  
Takahiro Matsumoto ◽  
Hidetaka Nakai ◽  
Seiji Ogo
Keyword(s):  
Crystal Structure ◽  
Active Species ◽  
Catalytic Cycle ◽  
Low Valent

Crystal Structure of Escherichia coli SsuE: Defining a General Catalytic Cycle for FMN Reductases of the Flavodoxin-like Superfamily

Biochemistry ◽  
2014 ◽  
Vol 53 (21) ◽  
pp. 3509-3519 ◽  
Author(s):  
Camden M. Driggers ◽  
Paritosh V. Dayal ◽  
Holly R. Ellis ◽  
P. Andrew Karplus
Keyword(s):  
Crystal Structure ◽  
Escherichia Coli ◽  
Catalytic Cycle

New insights into the mechanism of molybdenum-catalyzed asymmetric alkylation

2004 ◽  
Vol 76 (3) ◽  
pp. 625-633 ◽  
Author(s):  
S. W. Krska ◽  
D. L. Hughes ◽  
R. A. Reamer ◽  
D. J. Mathre ◽  
M. Palucki ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Solid State ◽  
Catalytic Cycle ◽  
Allylic Alkylation ◽  
Nmr Analysis ◽  
Minor Isomer ◽  
Asymmetric Alkylation ◽  
Anionic Ligand ◽  
Reaction Proceeds ◽  
A Minor

The major features of the catalytic cycle, including structures of key intermediates, have been determined for the molybdenum-catalyzed asymmetric alkylation. The crystal structure of the π-allyl intermediate exhibits 3-point binding of an anionic ligand. Based on NMR analysis, this species adopts in solution a structure consistent with that observed in the solid state. For the allylic alkylation, the crystal structure predicts the opposite stereochemistry vs. that observed experimentally, which suggests that either the reaction proceeds via a minor isomer (Curtin-Hammett conditions) or with retention of configuration. In addition, CO transfer, promoted by Mo(CO)6, has been found to play a key role in catalyst turnover.

Crystal Structure Determination of Glycerol-Containing Lipids from Electron Diffraction Data. Use of Analog Compounds Based upon Configurational Isomers of Cyclopentane-1, 2, 3-TRIOL

1977 ◽  
Vol 35 ◽  
pp. 24-25
Author(s):  
Douglas L. Dorset ◽  
Anthony J. Hancock
Keyword(s):  
Crystal Structure ◽  
Electron Diffraction ◽  
Diffraction Data ◽  
Structure Determination ◽  
Crystal Surface ◽  
Coherent Scattering ◽  
Crystal Structure Determination ◽  
Electron Diffraction Data ◽  
Polar Group ◽  
Axis Orientation

Lipids containing long polymethylene chains were among the first compounds subjected to electron diffraction structure analysis. It was only recently realized, however, that various distortions of thin lipid microcrystal plates, e.g. bends, polar group and methyl end plane disorders, etc. (1-3), restrict coherent scattering to the methylene subcell alone, particularly if undistorted molecular layers have well-defined end planes. Thus, ab initio crystal structure determination on a given single uncharacterized natural lipid using electron diffraction data can only hope to identify the subcell packing and the chain axis orientation with respect to the crystal surface. In lipids based on glycerol, for example, conformations of long chains and polar groups about the C-C bonds of this moiety still would remain unknown.One possible means of surmounting this difficulty is to investigate structural analogs of the material of interest in conjunction with the natural compound itself. Suitable analogs to the glycerol lipids are compounds based on the three configurational isomers of cyclopentane-1,2,3-triol shown in Fig. 1, in which three rotameric forms of the natural glycerol derivatives are fixed by the ring structure (4-7).

Spherulitic crystal growth in the prodissoconch larval of Crassostrea virginica

1983 ◽  
Vol 41 ◽  
pp. 518-519
Author(s):  
George G. Cocks ◽  
Louis Leibovitz ◽  
DoSuk D. Lee
Keyword(s):  
Crystal Structure ◽  
Crassostrea Virginica ◽  
Crystal Orientation ◽  
Developmental Changes ◽  
Gastrula Stage ◽  
Orthorhombic Crystal ◽  
Orthorhombic Crystal Structure ◽  
Stages Of Growth ◽  
Early Stages ◽  
Initial Deposition

Our understanding of the structure and the formation of inorganic minerals in the bivalve shells has been considerably advanced by the use of electron microscope. However, very little is known about the ultrastructure of valves in the larval stage of the oysters. The present study examines the developmental changes which occur between the time of conception to the early stages of Dissoconch in the Crassostrea virginica(Gmelin), focusing on the initial deposition of inorganic crystals by the oysters.The spawning was induced by elevating the temperature of the seawater where the adult oysters were conditioned. The eggs and sperm were collected separately, then immediately mixed for the fertilizations to occur. Fertilized animals were kept in the incubator where various stages of development were stopped and observed. The detailed analysis of the early stages of growth showed that CaCO3 crystals(aragonite), with orthorhombic crystal structure, are deposited as early as gastrula stage(Figuresla-b). The next stage in development, the prodissoconch, revealed that the crystal orientation is in the form of spherulites.

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