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Wyszukujesz frazę "Xavier, C." wg kryterium: Autor


Tytuł:
Crystal structure of rhodopsin in complex with a mini-$G_{o}$ sheds light on the principles of G protein selectivity
Autorzy:
Weinert, Tobias
Nogły, Przemysław
Ma, Pikyee
Carpenter, Byron
Nehmé, Rony
Tsai, Ching-Ju
Deupi, Xavier
Tate, Christopher G.
Edwards, Patricia C.
Standfuss, Jörg
Gruhl, Thomas
Flock, Tilman
Pamula, Filip
Schertler, Gebhard F. X.
Mühle, Jonas
Opis:
Selective coupling of G protein (heterotrimeric guanine nucleotide-binding protein)-coupled receptors (GPCRs) to specific Gα-protein subtypes is critical to transform extracellular signals, carried by natural ligands and clinical drugs, into cellular responses. At the center of this transduction event lies the formation of a signaling complex between the receptor and G protein. We report the crystal structure of light-sensitive GPCR rhodopsin bound to an engineered mini-Go protein. The conformation of the receptor is identical to all previous structures of active rhodopsin, including the complex with arrestin. Thus, rhodopsin seems to adopt predominantly one thermodynamically stable active conformation, effectively acting like a "structural switch," allowing for maximum efficiency in the visual system. Furthermore, our analysis of the well-defined GPCR-G protein interface suggests that the precise position of the carboxyl-terminal "hook-like" element of the G protein (its four last residues) relative to the TM7/helix 8 (H8) joint of the receptor is a significant determinant in selective G protein activation.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Tytuł:
In vitro and in vivo activity of a new unsymmetrical dinuclear copper complex containing a derivative ligand of 1,4,7-triazacyclononane : catalytic promiscuity of $[Cu_{2}(L)Cl_{3}]$
Autorzy:
Haase, Wolfgang
Neves, Ademir
Schilling, Eduardo L.
Osório, Renata E. H. M. B.
Vilhena, Felipe
Szpoganicz, Bruno
Almeida, Vicente R. de
Bessa, Luiza M.
Pereira, Marcos D.
Bortoluzzi, Adailton J.
Xavier, Fernando R.
Bortolotto, Tiago
Alves, Odivaldo C.
Eleutherio, Elis C. A.
Tomkowicz, Zbigniew
Cavalett, Angelica
Terenzi, Hernán
Castro, Frederico A. V.
Costa, Thiago G.
Opis:
Here we present the synthesis of the dinuclear complex $[Cu_{2}^{II}(L)Cl_{3}]$ (1), where L is the deprotonated form of the 3-[(4,7-diisopropyl-1,4,7-triazacyclononan-1-yl)methyl]-2-hydroxy-5-methylbenzaldehyde ligand. The complex was characterized by single crystal X-ray diffraction, potentiometric titration, mass spectrometry, electrochemical and magnetic measurements, EPR, UV-Vis and IR. Complex 1 is able to increase the hydrolysis rate of the diester bis-(2,4-dinitrophenyl)phosphate (2,4-BDNPP) by a factor of 2700, and also to promote the plasmidial DNA cleavage at pH 6 and to inhibit the formazan chromophore formation in redox processes at pH 7. Using Saccharomyces cerevisiae (BY4741) as a eukaryotic cellular model, we observed that 1 presents reduced cytotoxicity. In addition, treatment of wild-type and mutant cells lacking Cu/Zn-superoxide dismutase (Sod1) and cytoplasmic catalase (Ctt1) with 1 promotes increased survival after $H_{2}O_{2}$ or menadione ($O_{2} ^{\cdot}$ -generator) stress, indicating that 1 might act as a Sod1 and Ctt1 mimetic. Considered together, these results support considerations regarding the dynamic behaviour of an unsymmetrical dinuclear copper(II) complex in solid state and in aqueous pH-dependent solution.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Tytuł:
Archaeologia Polona Vol. 53 (2015)
Cultural variations of the Neolithic landscape of Thessaly
Autorzy:
Arachoviti, Polyxeni
Karampatsou, Georgia
García, Carmen C.
Almatzi, Kaliopi
Rondiri, Vasso
Efstathiou, Despina
Argyriou, Nassos
Simon, François-Xavier
Kalogiropoulou, Evita
Dederix, Sylviane
Nikas, Nikos
Donati, Jamieson
Sarris, Apostolos
Cantoro, Gianluca
Kalayci, Tuna
Manzetti, Cristina
Vouzaxakis, Konstantinos
Stamelou, Evangelia
Manataki, Meropi
Wydawca:
Institute of Archaeology and Ethnology Polish Academy of Sciences
Powiązania:
Archaeologia Polona
Floras, S. and Sgouras, I. 2004. Reconnaisance survey of the geology and the soils. In H.R. Reinders (ed.), Prehistoric sites at the Almiros and Sourpi Plains (Thessaly, Greece), Publications of the Netherlands Institute at Athens 5, Athens, 6-19
Wijnen, M. and Rondiri, V. 2004. Neolithic. In H.R. Reinders (ed.), Prehistoric sites at the Almiros and Sourpi Plains (Thessaly, Greece), Publications of the Netherlands Institute at Athens 5, Athens, 20-38
Opis:
il. ; 24 cm
ill. ; 24 cm
Dostawca treści:
RCIN - Repozytorium Cyfrowe Instytutów Naukowych
Inne

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