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  • 1
    Electronic Resource
    Electronic Resource
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 55 (1999), S. 689-690 
    ISSN: 1399-0047
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: The Rhodobacter capsulatus BchI protein is one of three subunits of Mg chelatase, the enzyme which catalyzes the first committed step of chlorophyll and bacteriochlorophyll biosynthesis. The BchI protein was produced with an inducible T7 RNA polymerase expression system in Escherichia coli. The protein was purified from the soluble cell-extract fraction and crystallized from polyethylene glycol solution. The crystals diffract to a minimum Bragg spacing of 2.1 Å. The space group is P63 with unit-cell dimensions a = b = 90.6, c = 84.1 Å.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 56 (2000), S. 149-151 
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: The structure of the title compound, {[Co(C2H8N2)3]Cl3}2·-[Na(H2O)6]Cl, has been redetermined to a higher degree of accuracy. The true space group is shown to be trigonal P3, but the structure is extremely close to hexagonal P63. Both of the independent Λ-[Co(en)3]Cl3 moieties (en is ethylenediamine) and the [Na(H2O)6]Cl unit reside on sites of crystallographic threefold symmetry. The sodium and chloride ions share the same lattice positions and the whole [Na(H2O)6]Cl unit is disordered over two positions in an approximate ratio of 0.73:0.27.
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  • 3
    Electronic Resource
    Electronic Resource
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 56 (2000), S. e435-e436 
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: The three title complexes, namely pentasodium tris(2,2′-oxydiacetato)neodymium(III) bis(tetrafluoroborate) hexahydrate and its samarium(III) and gadolinium(III) analogues, (I)–(III), respectively, are isomorphous and isostructural and have crystallographic D3 symmetry. The lanthanide metal ions are nine-coordinate, binding to three O atoms of three oxodiacetate ligands. One Na+ ion is octahedrally coordinated to six O atoms and the other Na+ ion is octahedrally coordinated to four O atoms and two F atoms. The structure is effectively an infinite three-dimensional polymer, consistent with the exceptional crystal quality. The racemic solutions spontaneously resolve on crystallization. For the individual crystals selected for structural analysis, the Nd and Sm complexes have the Λ configuration, while the Gd complex has the Δ configuration. The lanthanide–oxygen distances show the expected contraction of ca 0.02 Å with increasing atomic number for the lanthanide metal.
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