Showing papers by "George M. Sheldrick published in 2001"
TL;DR: This is the first monodomain bis-histidinyl monoheme cytochrome c to be structurally characterized and builds up a two-strand antiparallel β-sheet in a hairpin motif, which extends through two molecules owing to crystal packing.
Abstract: The crystal structure of low-potential cytochrome c
549, an extrinsic component of the photosystem II (PS II) from Synechocystis sp. PCC 6803, was obtained directly from single-wavelength 1.21 A resolution diffraction data. This is the first monodomain bis-histidinyl monoheme cytochrome c to be structurally characterized. The extended N-terminal region of c
549 builds up a two-strand antiparallel β-sheet in a hairpin motif, which extends through two molecules owing to crystal packing. Both peptide termini are involved in crystal contacts, which may explain their protrusion out of the globular fold. The C-terminus is preceded by a 9 A-long hydrophobic finger extending from a positively charged base and could be involved in PSII interactions, as well as a protruding negative patch built by a set of conserved acidic residues among c
549 sequences.
37 citations
TL;DR: In this paper, it was shown that it is possible to replace the solvent molecules in the channels by metal atoms forming quantum wires, giving rise to potentially endless tubes with diameters of ca. 28 .
Abstract: The biggest known quasi-rigid macrocycle is the cyclotetraicosaphenylene 1. Determining the X-ray crystal structure was a challenge which took more than a year. The three-dimensional packing shows the molecules to be piled up like coins or more precisely like garden chairs, giving rise to potentially endless tubes with diameters of ca. 28 . In the crystal these channels are filled with liquid solvent which is amorphously frozen during data collection at 133 K. In principle, it should be possible to replace the solvent molecules in the channels by metal atoms forming quantum wires.
14 citations
TL;DR: The inclusion complex of 2.7-dihydroxynaphthalene has been shown to be of the herringbone type as discussed by the authors, with one 2.2,7-D phthalene included completely in the β-CD cavity, its long axis being oriented along the beta-CD molecular axis.
13 citations