Fluorides and fluoro acids. 14. Crystal structures of acid hydrates and oxonium salts. 24. First examples of type I clathrate hydrates of strong acids: polyhydrates of hexafluorophosphoric, tetrafluoroboric, and perchloric acid

1987 ◽  
Vol 109 (4) ◽  
pp. 1200-1202 ◽  
Author(s):  
Dietrich Mootz ◽  
Ernst Josef Oellers ◽  
Michael Wiebcke
Keyword(s):  
Crystal Structures ◽  
Perchloric Acid ◽  
Clathrate Hydrates ◽  
Type I ◽  
Strong Acids ◽  
Oxonium Salts

scholarly journals Crystal structures of aconitase X enzymes from bacteria and archaea provide insights into the molecular evolution of the aconitase superfamily

2021 ◽  
Vol 4 (1) ◽  
Author(s):  
Seiya Watanabe ◽  
Yohsuke Murase ◽  
Yasunori Watanabe ◽  
Yasuhiro Sakurai ◽  
Kunihiko Tajima
Keyword(s):  
Molecular Evolution ◽  
Agrobacterium Tumefaciens ◽  
Crystal Structures ◽  
Epr Spectroscopy ◽  
Binding Sites ◽  
Active Sites ◽  
Type I ◽  
Type Ii ◽  
Thermococcus Kodakarensis ◽  
Evolutionary Scenario

AbstractAconitase superfamily members catalyze the homologous isomerization of specific substrates by sequential dehydration and hydration and contain a [4Fe-4S] cluster. However, monomeric and heterodimeric types of function unknown aconitase X (AcnX) have recently been characterized as a cis-3-hydroxy-L-proline dehydratase (AcnXType-I) and mevalonate 5-phosphate dehydratase (AcnXType-II), respectively. We herein elucidated the crystal structures of AcnXType-I from Agrobacterium tumefaciens (AtAcnX) and AcnXType-II from Thermococcus kodakarensis (TkAcnX) without a ligand and in complex with substrates. AtAcnX and TkAcnX contained the [2Fe-2S] and [3Fe-4S] clusters, respectively, conforming to UV and EPR spectroscopy analyses. The binding sites of the [Fe-S] cluster and substrate were clearlydifferent from those that were completely conserved in other aconitase enzymes; however, theoverall structural frameworks and locations of active sites were partially similar to each other.These results provide novel insights into the evolutionary scenario of the aconitase superfamilybased on the recruitment hypothesis.

Crystal structures of the thymidine kinase from herpes simplex virus type-I in complex with deoxythymidine and Ganciclovir

1995 ◽  
Vol 2 (10) ◽  
pp. 876-881 ◽  
Author(s):  
D.G. Brown ◽  
R. Visse ◽  
G. Sandhu ◽  
A. Davies ◽  
P.J. Rizkallah ◽  
...  
Keyword(s):  
Herpes Simplex Virus ◽  
Herpes Simplex ◽  
Thymidine Kinase ◽  
Crystal Structures ◽  
Virus Type ◽  
Herpes Simplex Virus Type ◽  
Type I ◽  
Simplex Virus

The theory of the crystallography of deformation twinning

1965 ◽  
Vol 288 (1413) ◽  
pp. 240-255 ◽  
Keyword(s):  
Crystal Structures ◽  
Deformation Twinning ◽  
Type I ◽  
Lattice Structures ◽  
Type Ii ◽  
Orientation Relationships ◽  
Tensor Calculus ◽  
Moving Interface ◽  
Twinning Shear ◽  
Crystallographic Characteristics

The crystallographic characteristics of deformation twinning are derived by considering the atomic movements which occur at the moving interface as a twin propagates. This is facilitated by making use of the notation of the tensor calculus, and general expressions, valid for all crystal structures, are obtained giving the magnitude of the twinning shear and relating the twinning elements for both type I and type II twinning. The atomic shuffles, which in general must accompany the twinning shear in both single and multiple lattice structures, are examined in detail and expressions are derived for their magnitudes and directions for the cases of the four classical orientation relationships associated with deformation twinning. The use of these expressions in predicting operative twinning modes is described and the relations between this theory and other recent theories of the crystallography of deformation twinning are discussed.

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