Smectic bimetallomesogens in β-enaminoketonate copper complexes: the steric effect of a methyl substituent on the core group and the crystal structure

1998 ◽  
pp. 1857-1862 ◽  
Author(s):  
Chung K. Lai ◽  
Raymond Lin ◽  
Min-Yi Lu ◽  
Kwo-Cheng Kao
Keyword(s):  
Crystal Structure ◽  
Copper Complexes ◽  
Steric Effect ◽  
Methyl Substituent ◽  
Core Group ◽  
The Core

Canonical Submersion and Lie Homomorphisms Normal Subgroup

2020 ◽  
Vol 23 (1) ◽  
pp. 97-101
Author(s):  
Mikhail Petrichenko ◽  
Dmitry W. Serow
Keyword(s):  
Normal Subgroup ◽  
Canonical System ◽  
System Of Equations ◽  
Core Group ◽  
The Core ◽  
Switch Group

Normal subgroup module f (module over the ring F = [ f ] 1; 2-diffeomorphisms) coincides with the kernel Ker Lf derivations along the field. The core consists of the trivial homomorphism (integrals of the system v = x = f (t; x )) and bundles with zero switch group Lf , obtained from the condition ᐁ( ω × f ) = 0. There is the analog of the Liouville for trivial immersion. In this case, the core group Lf derivations along the field replenished elements V ( z ), such that ᐁz = ω × f. Hence, the core group Lf updated elements helicoid (spiral) bundles, in particular, such that f = ᐁU. System as an example Crocco shown that the canonical system does not permit the trivial embedding: the canonical system of equations are the closure of the class of systems that permit a submersion.

scholarly journals Crystal Structure of African Swine Fever Virus pS273R Protease and Implications for Inhibitor Design

2020 ◽  
Vol 94 (10) ◽  
Author(s):  
Guobang Li ◽  
Xiaoxia Liu ◽  
Mengyuan Yang ◽  
Guangshun Zhang ◽  
Zhengyang Wang ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Structural Information ◽  
African Swine Fever Virus ◽  
African Swine Fever ◽  
Hydrolytic Activity ◽  
Viral Disease ◽  
Fever Virus ◽  
Dna Virus ◽  
Core Domain ◽  
The Core

ABSTRACT African swine fever (ASF) is a highly contagious hemorrhagic viral disease of domestic and wild pigs that is responsible for serious economic and production losses. It is caused by the African swine fever virus (ASFV), a large and complex icosahedral DNA virus of the Asfarviridae family. Currently, there is no effective treatment or approved vaccine against the ASFV. pS273R, a specific SUMO-1 cysteine protease, catalyzes the maturation of the pp220 and pp62 polyprotein precursors into core-shell proteins. Here, we present the crystal structure of the ASFV pS273R protease at a resolution of 2.3 Å. The overall structure of the pS273R protease is represented by two domains named the “core domain” and the N-terminal “arm domain.” The “arm domain” contains the residues from M1 to N83, and the “core domain” contains the residues from N84 to A273. A structure analysis reveals that the “core domain” shares a high degree of structural similarity with chlamydial deubiquitinating enzyme, sentrin-specific protease, and adenovirus protease, while the “arm domain” is unique to ASFV. Further, experiments indicated that the “arm domain” plays an important role in maintaining the enzyme activity of ASFV pS273R. Moreover, based on the structural information of pS273R, we designed and synthesized several peptidomimetic aldehyde compounds at a submolar 50% inhibitory concentration, which paves the way for the design of inhibitors to target this severe pathogen. IMPORTANCE African swine fever virus, a large and complex icosahedral DNA virus, causes a deadly infection in domestic pigs. In addition to Africa and Europe, countries in Asia, including China, Vietnam, and Mongolia, were negatively affected by the hazards posed by ASFV outbreaks in 2018 and 2019, at which time more than 30 million pigs were culled. Until now, there has been no vaccine for protection against ASFV infection or effective treatments to cure ASF. Here, we solved the high-resolution crystal structure of the ASFV pS273R protease. The pS273R protease has a two-domain structure that distinguishes it from other members of the SUMO protease family, while the unique “arm domain” has been proven to be essential for its hydrolytic activity. Moreover, the peptidomimetic aldehyde compounds designed to target the substrate binding pocket exert prominent inhibitory effects and can thus be used in a potential lead for anti-ASFV drug development.

scholarly journals Planar and distorted indigo as the core motif in novel chromophoric liquid crystals

2015 ◽  
Vol 39 (11) ◽  
pp. 8291-8301 ◽  
Author(s):  
Jan H. Porada ◽  
Jörg-M. Neudörfl ◽  
Dirk Blunk
Keyword(s):  
Crystal Structure ◽  
Liquid Crystals ◽  
Structure Analysis ◽  
Crystal Structure Analysis ◽  
Phase Behaviour ◽  
Core Motif ◽  
The Core

The phase behaviour of calamitic indigoid liquid crystals was investigated and rationalised on the basis of a crystal structure analysis.

scholarly journals Synthesis and structural characterization of hexa-μ2-chlorido-μ4-oxido-tetrakis{[4-(phenylethynyl)pyridine-κN]copper(II)} dichloromethane monosolvate

2021 ◽  
Vol 77 (1) ◽  
pp. 42-46
Author(s):  
Rayya A. Al Balushi ◽  
Muhammad S. Khan ◽  
Md. Serajul Haque Faizi ◽  
Ashanul Haque ◽  
Kieran Molloy ◽  
...  
Keyword(s):  
Molecular Structure ◽  
Crystal Structure ◽  
Structural Characterization ◽  
Title Compound ◽  
Three Dimensional ◽  
Hirshfeld Surface ◽  
The Core ◽  
Dimensional Network ◽  
Packing Arrangement

In the crystal structure of the title compound, [Cu4Cl6O(C13H9N)4]·CH2Cl2, the core molecular structure consists of a Cu4 tetrahedron with a central interstitial O atom. Each edge of the Cu4 tetrahedron is bridged by a chlorido ligand. Each copper(II) cation is coordinated to the central O atom, two chlorido ligands and one N atom of the 4-phenylethynylpyridine ligand. In the crystal, the molecules are linked by intermolecular C—H...Cl interactions. Furthermore, C—H...π and π–π interactions also connect the molecules, forming a three-dimensional network. Hirshfeld surface analysis indicates that the most important contributions for the packing arrangement are from H...H and C...H/H...C interactions.

scholarly journals Lessons Learned from the CORE Group Polio Project and Their Relevance for Other Global Health Priorities

2019 ◽  
Vol 101 (4_Suppl) ◽  
pp. 107-112 ◽  
Author(s):  
Henry B. Perry ◽  
Roma Solomon ◽  
Filimona Bisrat ◽  
Lisa Hilmi ◽  
Katherine V. Stamidis ◽  
...  
Keyword(s):  
Global Health ◽  
Lessons Learned ◽  
Health Priorities ◽  
Core Group ◽  
The Core

scholarly journals Crystal structure and electrochemical properties of [Ni(bztmpen)(CH3CN)](BF4)2{bztmpen isN-benzyl-N,N′,N′-tris[(6-methylpyridin-2-yl)methyl]ethane-1,2-diamine}

2017 ◽  
Vol 73 (6) ◽  
pp. 825-828
Author(s):  
Lin Chen ◽  
Gan Ren ◽  
Yakun Guo ◽  
Ge Sang
Keyword(s):  
Crystal Structure ◽  
Electrochemical Properties ◽  
Catalytic Reaction ◽  
Room Temperature ◽  
Title Complex ◽  
Methyl Substituent ◽  
Coordination Environment ◽  
Acetonitrile Molecule ◽  
Redox Couples ◽  
Open Site

The mononuclear nickel title complex (acetonitrile-κN){N-benzyl-N,N′,N′-tris[(6-methylpyridin-2-yl)methyl]ethane-1,2-diamine}nickel(II) bis(tetrafluoridoborate), [Ni(C30H35N5)(CH3CN)](BF4)2, was prepared from the reaction of Ni(BF4)2·6H2O withN-benzyl-N,N′,N′-tris[(6-methylpyridin-2-yl)methyl]ethane-1,2-diamine (bztmpen) in acetonitrile at room temperature. With an open site occupied by the acetonitrile molecule, the nickel(II) atom is chelated by five N-atom sites from the ligand and one N atom from the ligand, showing an overall octahedral coordination environment. Compared with analogues where the 6–methyl substituent is absent, the bond length around the Ni2+cation are evidently longer. Upon reductive dissociation of the acetronitrile molecule, the title complex has an open site for a catalytic reaction. The title complex has two redox couples at −1.50 and −1.80 V (versus Fc+/0) based on nickel. The F atoms of the two BF4−counter-anions are split into two groups and the occupancy ratios refined to 0.611 (18):0.389 (18) and 0.71 (2):0.29 (2).

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