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Synthesis, structure, and properties of a dialumane supported by pyrazolate ligands

01-Mar-2015 | Christopher J. Snyder; Peter Zavalij; Kit Bowen; Hansgeorg Schnöckel; Bryan Eichhorn, Dalton Transactions, 2015

The dialumane [Al2][Na(Ph2pz)3]2 (1) has been prepared by the reaction of Na(Ph2pz) with a metastable solution of AlCl. The structure of 1 contains two hydrotris(pyrazolyl)borate-like Na(Ph2pz)32− moieties that are coordinated to each Al atom of the dialumane in a κ2,κ1-N,N,N fashion and several ...

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Solution structure and biophysical characterization of the multifaceted signalling effector protein growth arrest specific-1

28-Feb-2015 | Rosti, Katja; Goldman, Adrian; Kajander, Tommi, BMC Biochemistry, 2015

Background: The protein growth arrest specific-1 (GAS1) was discovered based on its ability to stop the cell cycle. During development it is involved in embryonic patterning, inhibits cell proliferation and mediates cell death, and has therefore been considered as a tumor suppressor. GAS1 is ...

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Co–C Bond Dissociation Energies in Cobalamin Derivatives and Dispersion Effects: Anomaly or Just Challenging?

26-Feb-2015 | Zheng-wang Qu; Andreas Hansen; Stefan Grimme, Journal of Chemical Theory and Computation, 2015

Accurate Co–C bond dissociation energies (BDEs) of large cobalamin derivatives in the gas phase and solution are crucial for understanding bond activation mechanisms in various enzymatic reactions. However, they are challenging for both experiment and theory as indicated by an obvious discrepancy ...

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Notch ligand Delta-like1: X-ray crystal structure and binding affinity

26-Feb-2015 | Kershaw N; Church N; Griffin M; Luo C; Adams T; Burgess A, Biochemical Journal, 2015

The Notch pathway is a fundamental signalling system in most multicellular animals. We have determined the X-ray crystal structure of the extracellular domain of the Notch ligand Delta-like ligand-1 (Dll-1). This is the first structure of a Delta-like ligand. The structure incorporates the ...

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Interaction of PiB‐Derivative Metal Complexes with Beta‐Amyloid Peptide: Selective Recognition of the Aggregated Forms

25-Feb-2015 | André F. Martins, David M. Dias, Jean‐François Morfin, Sara Lacerda, Douglas V. Laurents, Éva Tóth, Carlos F. G. C. ..., Chemistry - A European Journal, 2015

Abstract Metal complexes are increasingly explored as imaging probes in amyloid peptide related pathologies. We report the first detailed study on the mechanism of interaction between a metal complex and both the monomer and the aggregated form of Aβ1–40 peptide. We have studied ...

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Substituent effects in solution speciation of the mononuclear and dinuclear trimethylplatinum(IV) iodide complexes of pyridines

25-Feb-2015 | Biswa Nath Ghosh; Dieter Lentz; Sabine Schlecht, New Journal of Chemistry, 2015

A series of mononuclear trimethylplatinum(IV) complexes, [PtMe3L2I] (L = 4-NCpy, 4-MeOpy, 4-Mepy, 4-Etpy, 4-tBupy and 4-Me2Npy) has been synthesized in good yield via reaction of trimethylplatinum(IV) iodide with excess pyridine ligands L in chloroform. The synthesized mononuclear [PtMe3L2I] ...

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Isotope Effects in 195Pt NMR Spectroscopy: Unique 35/37Cl- and 16/18O-Resolved “Fingerprints” for All [PtCl6–n(OH)n]2– (n = 1–5) Anions in an Alkaline Solution and the Implications of the Trans Influence

20-Feb-2015 | Leon Engelbrecht; Pieter Murray; Klaus R. Koch, Inorganic Chemistry, 2015

A detailed analysis of the intrinsic 1Δ195Pt(37/35Cl) and 1Δ195Pt(18/16O) isotope 128.8 MHz 195Pt NMR profiles of the series of kinetically inert [PtCl6–n(OH)n]2– (n = 1–5) anions generated in strongly alkaline aqueous solutions shows that each 195Pt NMR resonance of the ...

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An Interconverting Family of Coordination Cages and a meso-Helicate; Effects of Temperature, Concentration, and Solvent on the Product Distribution of a Self-Assembly Process

20-Feb-2015 | William Cullen; Christopher A. Hunter; Michael D. Ward, Inorganic Chemistry, 2015

The self-assembly between a water-soluble bis-bidentate ligand L18w and Co(II) salts in water affords three high-spin Co(II) products: a dinuclear meso-helicate [Co2(L18w)3]X4; a tetrahedral cage [Co4(L18w)6]X8; and a dodecanuclear truncated-tetrahedral cage [Co12(L18w)18]X24 (X = BF4 or ClO4). ...

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Structural Mechanisms Underlying Sequence-Dependent Variations in GAG Affinities of Decorin Binding Protein A, a {Less than}i{Greater than}Borrelia burgdorferi{Less than}/i{Greater than} Adhesin

19-Feb-2015 | Morgan A; Wang X, Biochemical Journal, 2015

Decorin binding protein A (DBPA) is an important surface adhesin of the bacterium Borrelia burgdorferi, the causative agent of Lyme disease. DBPA facilitates the bacteria’s colonization of human tissue by adhering to glycosaminoglycan (GAG), a sulfated polysaccharide. Interestingly, DBPA sequence ...

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Tris‐Functionalized Hybrid Anderson Polyoxometalates: Synthesis, Characterization, Hydrolytic Stability and Inversion of Protein Surface Charge

10-Feb-2015 | Amir Blazevic, Emir Al‐Sayed, Alexander Roller, Gerald Giester, Annette Rompel, Chemistry - A European Journal, 2015

Abstract Single‐ and double‐sided functionalized hybrid organic–inorganic Anderson polyoxomolybdates with GaIII and FeIII positioned as central heteroatoms have been synthesized in a mild, two‐step synthesis in an aqueous medium. Compounds 1–4 were isolated as hydrated salts, ...

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