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  • 1
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    Uncovering the assembly pathway of human ribosomes and its emerging links to disease (2019)
    Springer Nature
    Details
    Publication Date: 2019
    Description: 〈p〉This review summarizes and integrates recent insights from loss-of-functions screens, genetic disorders and structural biology, which begin to close the gap in understanding human ribosome biogenesis compared to yeast.〈/p〉
    Print ISSN: 0261-4189
    Electronic ISSN: 1460-2075
    Topics: Biology , Medicine
    Published by Springer Nature on behalf of The European Molecular Biology Organization (EMBO).
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  • 2
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    The interaction of DNA repair factors ASCC2 and ASCC3 is affected by somatic cancer mutations (2020)
    Springer Nature
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    Publication Date: 2020-11-02
    Description: The ASCC3 subunit of the activating signal co-integrator complex is a dual-cassette Ski2-like nucleic acid helicase that provides single-stranded DNA for alkylation damage repair by the α-ketoglutarate-dependent dioxygenase AlkBH3. Other ASCC components integrate ASCC3/AlkBH3 into a complex DNA repair pathway. We mapped and structurally analyzed interacting ASCC2 and ASCC3 regions. The ASCC3 fragment comprises a central helical domain and terminal, extended arms that clasp the compact ASCC2 unit. ASCC2–ASCC3 interfaces are evolutionarily highly conserved and comprise a large number of residues affected by somatic cancer mutations. We quantified contributions of protein regions to the ASCC2–ASCC3 interaction, observing that changes found in cancers lead to reduced ASCC2–ASCC3 affinity. Functional dissection of ASCC3 revealed similar organization and regulation as in the spliceosomal RNA helicase Brr2. Our results delineate functional regions in an important DNA repair complex and suggest possible molecular disease principles.
    Electronic ISSN: 2041-1723
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General , Physics
    Published by Springer Nature
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  • 3
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    Association of snR190 snoRNA chaperone with early pre-60S particles is regulated by the RNA helicase Dbp7 in yeast (2021)
    Springer Nature
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    Publication Date: 2021-10-22
    Description: Synthesis of eukaryotic ribosomes involves the assembly and maturation of precursor particles (pre-ribosomal particles) containing ribosomal RNA (rRNA) precursors, ribosomal proteins (RPs) and a plethora of assembly factors (AFs). Formation of the earliest precursors of the 60S ribosomal subunit (pre-60S r-particle) is among the least understood stages of ribosome biogenesis. It involves the Npa1 complex, a protein module suggested to play a key role in the early structuring of the pre-rRNA. Npa1 displays genetic interactions with the DExD-box protein Dbp7 and interacts physically with the snR190 box C/D snoRNA. We show here that snR190 functions as a snoRNA chaperone, which likely cooperates with the Npa1 complex to initiate compaction of the pre-rRNA in early pre-60S r-particles. We further show that Dbp7 regulates the dynamic base-pairing between snR190 and the pre-rRNA within the earliest pre-60S r-particles, thereby participating in structuring the peptidyl transferase center (PTC) of the large ribosomal subunit.
    Electronic ISSN: 2041-1723
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General , Physics
    Published by Springer Nature
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  • 4
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    The RNA helicase Dbp7 promotes domain V/VI compaction and stabilization of inter-domain interactions during early 60S assembly (2021)
    Springer Nature
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    Publication Date: 2021-10-22
    Description: Early pre-60S ribosomal particles are poorly characterized, highly dynamic complexes that undergo extensive rRNA folding and compaction concomitant with assembly of ribosomal proteins and exchange of assembly factors. Pre-60S particles contain numerous RNA helicases, which are likely regulators of accurate and efficient formation of appropriate rRNA structures. Here we reveal binding of the RNA helicase Dbp7 to domain V/VI of early pre-60S particles in yeast and show that in the absence of this protein, dissociation of the Npa1 scaffolding complex, release of the snR190 folding chaperone, recruitment of the A3 cluster factors and binding of the ribosomal protein uL3 are impaired. uL3 is critical for formation of the peptidyltransferase center (PTC) and is responsible for stabilizing interactions between the 5′ and 3′ ends of the 25S, an essential pre-requisite for subsequent pre-60S maturation events. Highlighting the importance of pre-ribosome remodeling by Dbp7, our data suggest that in the absence of Dbp7 or its catalytic activity, early pre-ribosomal particles are targeted for degradation.
    Electronic ISSN: 2041-1723
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General , Physics
    Published by Springer Nature
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  • 5
    Electronic Resource
    Electronic Resource
    Effects of fibronectin on actin organization and respiratory burst activity in neutrophils, monocytes, and macrophages (1994)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Cellular Physiology 158 (1994), S. 347-353 
    Details
    ISSN: 0021-9541
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: Previous studies have shown that fibronectin (Fn) enhances phagocytosis and killing of antibody-coated bacteria by neutrophils and macrophages. In an attempt to understand the mechanism of this enhancement, we have investigated the effects of Fn on phagocytosis-related actin organization as well as respiratory burst activity in neutrophils, monocytes and culture-derived macrophages. Employing an NBD-phallacidin flow cytometric analysis of filamentous actin formation, we found that Fn promotes rapid actin polymerization within 30 seconds in neutrophils, monocytes, and macrophages, but not lymphocytes. Enhancement of actin polymerization by Fn was concentration-dependent and mediated by a pertussis toxin- but not cholera toxin- sensitive G protein. Inhibition of protein kinase C by sphingosine (20 μM), calcium influx by verapamil (0.1 mM), or intracellular calcium mobilization by 8-(N, N-diethyl-amino) octyl-3,4,5-trimethoxybenzoate HCI (TMB-8; 0.1 mM) did not block Fn-enhanced actin polymerization in phagocytes. Incubation of neutrophils and macrophages on microtiter plates precoated with Fn suppressed superoxide (O2-) production induced by IgG- and IgA- opsonized group B streptococci. In contrast, Fn significantly enhanced IgA- and IgG-mediated O2- production by freshly isolated monocytes. These data suggest that Fn enhances phagocytosis, presumably through G protein-coupled cytoskeleton reorganization and augments O2- production by circulating monocytes. In contrast, it appears to suppress O2- production by the active phagocytic cells, neutrophils and macrophages. This may result in enhanced phagocytosis and intracellular killing of microorganisms without damaging interstitial tissues. © 1994 Wiley-Liss, Inc.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jcp.1041580217
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  • 6
    Electronic Resource
    Electronic Resource
    Synthese und Kristallstruktur von (NH4)3Cu4Ho2Br13. Weitere Bromide vom Typ (NH4)3Cu4M2Br13 (M = Dy—Lu, Y) und Rb3Cu4Ho2Br13Frau Professor Marianne Baudler zum 75. Geburtstag gewidmet (1996)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 622 (1996), S. 675-678 
    Details
    ISSN: 0044-2313
    Keywords: Rare Earths ; Bromides ; Copper ; Synthesis ; Crystal Structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis and Crystal Structure of (NH4)3Cu4Ho2Br13. Further Bromides of the (NH4)3Cu4M2Br13 Type (M = Dy—Lu, Y) and on Rb3Cu4Ho2Br13Single crystals of (NH4)3Cu4Ho2Br13 were obtained for the first time from the reaction of CuBr with HoBr3 which was contaminated with NH4Br: cubic, space group Pn3, Z = 2, a = 1101.71(5) pm. The crystal structure may be considered as a variant of the fluorite type according to [(HoBr6)4][(NH4)6(Cu4Br)2] ≡ Ca4F8. Pure products can be prepared from the binary halides in glass ampoules at 350°C. The bromides (NH4)3Cu4M2Br13 (M = Dy—Lu, Y) and Rb3Cu4Ho2Br13 are isotypic with (NH4)3Cu4Ho2Br13.
    Notes: Einkristalle von (NH4)3Cu4Ho2Br13 wurden erstmals bei der Reaktion von CuBr mit HoBr3, das mit NH4Br „verunreinigt“ war, erhalten: kubisch, Raumgruppe Pn3, Z = 2, a = 1101,71(5) pm. Die Kristallstruktur ist gemäß [(HoBr6)4][(NH4)6(Cu4Br)2] ≡ Ca4F8 als eine Variante des Flußspat-Typs aufzufassen. Reine Produkte können aus den binären Halogeniden bei 350°C in Glasampullen dargestellt werden. Die Bromide (NH4)3Cu4M2Br13 (M = Dy—Lu, Y) und Rb3Cu4Ho2Br13 sind mit (NH4)3Cu4Ho2Br13 isotyp.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19966220417
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  • 7
    Electronic Resource
    Electronic Resource
    Ternäre Halogenide vom Typ A3MX6. VII [1]. Die Bromide Li3MBr6 (M=Sm—Lu, Y): Synthese, Kristallstruktur, Ionenbeweglichkeit (1997)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 623 (1997), S. 1352-1356 
    Details
    ISSN: 0044-2313
    Keywords: Lithium ; Rare Earth Halides ; Crystal Structure ; Ionic Conductivity ; NMR Spectroscopy ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Ternary Halides of the A3MX6Type. VII. The Bromides Li3MBr6 (M=Sm—Lu, Y): Synthesis, Crystal Structure, and Ionic MobilityThe bromides Li3MBr6 (M=Sm—Lu, Y) are obtained from the binary components LiBr and MBr3. They crystallize with a substitution/addition variant of the AlCl3- type of structure as was established from single crystal X-ray diffraction data for Li3ErBr6 (monoclinic, C2/m, Z = 2, a = 689.0(3), b = 1191.6(9), c = 684.2(6) pm, β = 109.77(6)°) and by powder X-ray diffraction for the remaining bromides. They are isotypic with Na3GdI6 and Li3ScCl6, respectively. Impedance spectroscopy and 7Li-NMR spectroscopy show that the lithium ions are highly mobile.
    Notes: Die Bromide Li3MBr6 (M=Sm—Lu, Y) erhält man durch Umsetzung der binären Komponenten LiBr und MBr3. Sie kristallisieren in einer Substitutions-Additions-Varianten des AlCl3-Typs, was anhand von röntgenographischen Untersuchungen an einem Einkristall von Li3ErBr6 (monoklin, C2/m, Z = 2, a = 689,0(3); b = 1191,6(9); c = 684,2(6) pm, β = 109,77(6)°) sowie an Pulverproben der übrigen Bromide nachgewiesen wurde. Sie sind isotyp mit Na3GdI6 bzw. Li3ScCl6. Impedanzmessungen und 7Li-NMR-Messungen an Pulverproben zeigen eine hohe Mobilität der Li+-Ionen.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19976230905
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  • 8
    Electronic Resource
    Electronic Resource
    Ternäre Halogenide vom Typ A3MX6. V. Synthese, Kristallstrukturen und Natrium-Ionenleitfähigkeit der ternären Iodide Na3MI6 (M = Sm, Gd-Dy) sowie der Mischkristalle Na3GdBr6-xIxProfessor Joachim Strähle zum 60. Geburtstage gewidmet (1997)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 623 (1997), S. 837-843 
    Details
    ISSN: 0044-2313
    Keywords: Rare-Earth Halides ; Crystal Structure ; Ionic Conductivity ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Ternary Halides of the A3MX6 Type. V. Synthesis, Crystal Structures, and Sodium Ionic Conductivity of the Ternary Iodides Na3MI6 (M = Sm, Gd-Dy) and of the Solid Solution Halides Na3GdBr6-xIxThe system Na3GdBr6-xIx exhibits a complete solid solution. The influence of the successive substitution of iodide for bromide on structure and ionic conductivity has been investigated systematically. X-ray structure determination from single crystal and powder data shows that the cryolite-type of structure is observed for x 〈 1 [Na3GdBr5.1I0.9, monoclinic, P21/n, Z = 2, a = 734.6(10), b = 779.5(9), c = 1101(2) pm, β = 90.8(2)°]. For x 〉 3 the new Na3GdI6 type is observed [monoclinic, C2/m, Z = 2, a = 787.5(1), b = 1353.4(2), c = 778.3(1) pm, β = 110.14(1)°; for Na3GdBr2.4I3.6: a = 772.7(4), b = 1323.3(7), c = 765.8(4) pm, β = 110.14(3)°]. In between, an ordered variant of the Na3GdI6 structure type is found with a doubled c axis [for Na3GdBr4.8I1.2: monoclinic, C2/c, Z = 4, a = 751.5(4), b = 1285.7(6), c = 1413.7(7) pm, β = 99,65(2)°]. Ionic conductivity measurements by impedance spectroscopy exhibit a decline of the activation energies for Na+ conductivity for halides with unchanged crystal structures with increasing substitution by iodide.
    Notes: Das System Na3GdBr6-XIX zeigt vollständige Mischkristallbildung. Der Einfluß des sukzessiven Austausches von Bromid gegen Iodid auf Struktur und Ionenleitfähigkeit wurde systematisch untersucht. Röntgenographische Untersuchungen an Einkristallen und Pulverproben ergaben, daß der Kryolith-Typ für x 〈 1 auftritt [Na3GdBr5,1I0,9 monoklin, P21/n, Z = 2, a = 734,6(10), b = 779,5(9), c = 1101(2) pm, β = 90,8(2)°]. Für x 〉 3 tritt der neue Na3GdI6-Typ auf [monoklin, C2/m, Z = 2, a = 787,5(1), b = 1353,4(2), c = 778,3(1) pm, β = 110,14(1)°; für Na3GdBr2,4I3,6: a = 772,7(4), b = 1323,3(7), c = 765,8(4) pm, β = 110,34(3)°]. Dazwischen beobachtet man eine ebenfalls bisher nicht bekannte Ordnungsvariante zum Na3GdI6-Typ, die eine verdoppelte c-Achse aufweist [für Na3GdBr4,8I1,2: monoklin, C2/c, Z = 4, a = 751,5(4), b = 1285,7(6), c = 1413,7(7) pm, β = 99,65(2)°]. Leitfähigkeitsmessungen mittels Impedanzspektroskopie zeigen in Bereichen mit unveränderter Kristallstruktur eine schrittweise Abnahme der Aktivierungsenergie mit zunehmendem Iodidgehalt.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.199762301132
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  • 9
    Electronic Resource
    Electronic Resource
    Ternäre Halogenide vom Typ A3MX6. IV. [1]. Ternäre Halogenide des Scandiums mit Natrium, Na3ScX6 (X = F, Cl, Br): Synthese, Strukturen, IonenleitfähigkeitIn memoriam Wilhelm Klemm (1996)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 622 (1996), S. 173-178 
    Details
    ISSN: 0044-2313
    Keywords: Scandium ; Halides ; Crystal Structures ; Ionic Conductivity ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Ternary Halides of the A3MX6 Type. IV. Ternary Halides of Scandium with Sodium, Na3ScX6 (X = F, Cl, Br): Synthesis, Structures, Ionic ConductivityX-ray studies on single crystals of Na3ScF6 and Na3ScBr6 show, that Na3ScF6 crystallizes with the cryolite type (monoclinic, P21/n, Z = 2, a = 560.16(9), b = 580.31(8), c = 812.1(2)pm, β = 90.720(14)°) and Na3ScBr6, as the only ternary bromide of the rare earth elements with sodium, in the Na3CrCl6 type (trigonal, P31c, Z = 2, a = 728.95(7), c = 1309.29(17)pm). The ionic conductivity of powder samples of Na3ScF6, Na3ScBr6 and of Na3ScCl6 was studied by impedance spectroscopy. Activation energies were determined as 1.22 eV, 0.80 eV and 0.71 eV for the fluoride, chloride and bromide, respectively. The differences are explained from the crystal structures and the sizes and polarizabilities of the anions.
    Notes: Röntgenographische Untersuchungen an Einkristallen von Na3ScF6 und Na3ScBr6 ergaben, daß Na3ScF6 im Kryolith-Typ (monoklin, P21/n, Z = 2, a = 560,16(9), b = 580,31(8), c = 812,1(2)pm, β = 90,720(14)°) und Na3ScBr6 als bisher einziges ternäres Bromid der Selten-Erd-Elemente mit Natrium im Na3CrCl6-Typ (trigonal, P31c, Z = 2, a = 728,95(7), c = 1309,29(17)pm) kristallisieren. An Pulverproben von Na3ScF6 und Na3ScBr6 sowie an Na3ScCl6 wurden Leitfähigkeitsuntersuchungen mittels Impedanzspektroskopie vorgenommen und aus den Ergebnissen die Aktivierungsenergien für den Leitungsprozeß zu 1,22 eV, 0,80 eV und 0,71 eV für das Fluorid, Chlorid bzw. Bromid bestimmt. Die Unterschiede werden aus den Kristallstrukturen sowie durch die Größen und Polarisierbarkeiten der Anionen erklärt.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19966220125
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  • 10
    Electronic Resource
    Electronic Resource
    Ternäre Halogenide vom Typ A3MX6. VI [1]. Ternäre Chloride der Selten-Erd-Elemente mit Lithium, Li3MCl6 (M = Tb—Lu, Y, Sc): Synthese, Kristallstrukturen und IonenbewegungProfessor Welf Bronger zum 65. Geburtstag gewidmet (1997)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 623 (1997), S. 1067-1073 
    Details
    ISSN: 0044-2313
    Keywords: Lithium ; Rare Earth Halides ; Crystal Structures ; Ionic Motion ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Ternary Halides of the A3MX6 Type. VI. Ternary Chlorides of the Rare-Earth Elements with Lithium, Li3MCl6 (M = Tb—Lu, Y, Sc): Synthesis, Crystal Structures, and Ionic MotionSingle crystal X-ray studies on the ternary chlorides Li3ErCl6, Li3YbCl6 and Li3ScCl6 show that they crystallize in three different structure types. Li3ErCl6 (trigonal, P3ml, Z = 3, a = 1117.7(2); c = 603.6(2) pm; the chlorides with M = Tb—Tm, Y are isotypic) and Li3YbCl6 (orthorhombic, Pnma, Z = 4, a = 1286.6(1); b = 1113.2(1); c = 602.95(8) pm; Li3LuCl6 is isotypic) have very similar structures that may be derived from hexagonal closest packings of chloride ions with the cations occupying octahedral holes in part statistically. Li3ScCl6 (monoclinic, C2/m, Z = 2, a = 639.8(1); b = 1104.0(2); c = 639,1(1) pm; β = 109.89(1)°) crystallizes isotypic with Na3GdI6 and Li3ErBr6, structures that may be derived from a cubic closes packings of anions. The ionic movement in Li3YCl6 and Li3YbCl6 has been investigated by impedance and 7Li-NMR spectroscopy.
    Notes: Die ternären Chloride Li3ErCl6, Li3YbCl6 und Li3ScCl6 kristallisieren nach röntgenographischen Untersuchungen an Einkristallen in drei verschiedenen Strukturtypen. Li3ErCl6 (trigonal, P3ml, Z = 3, a = 1117,7(2); c = 603,6(2) pm; isotyp mit M = Tb—Tm, Y) und Li3YbCl6 (orthorhombisch, Pnma, Z = 4, a = 1286,6(1); b = 1113,2(1); c = 602,95(8) pm; Li3LuCl6 ist isotyp) haben sehr ähnliche Strukturen, die sich als hexagonal-dichteste Kugelpackungen von Chlorid-Ionen mit zum Teil statistischer Auffüllung der Oktaederlücken mit Kationen beschreiben lassen. Li3ScCl6 (monoklin, C2/m, Z = 2, a = 639,8(1); b = 1104,0(2); c = 639,1(1) pm; β = 109,89(1)°) kristallisiert isotyp mit Na3GdI6 und Li3ErBr6; die Anionen bilden hier eine kubisch-dichteste Kugelpackung. Die Ionenbewegung in Li3YCl6 und Li3YbCl6 wurde mittels Impedanzspektroskopie und 7Li-NMR-Spektroskopie untersucht.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19976230710
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