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  • 1990-1994  (5)
  • 1975-1979  (2)
Materialart
Erscheinungszeitraum
Jahr
  • 1
    Digitale Medien
    Digitale Medien
    s.l. : American Chemical Society
    Biochemistry 32 (1993), S. 7966-7971 
    ISSN: 1520-4995
    Quelle: ACS Legacy Archives
    Thema: Biologie , Chemie und Pharmazie
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 24 (1991), S. 857-865 
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Notizen: With the availability of synchrotron-radiation facilities, new approaches to time-resolved structural experiments in biology have been developed. The common feature of the experiments described is the use of powerful light sources to trigger structural transitions by flash photolysis, flash excitation or laser temperature jump. Special emphasis will be given to the selection criteria for a laser temperature jump system and to the performance of the selected erbium glass laser as a tool for rapid temperature jumps. Experiments are presented on the structure and kinetics of muscle contraction, lipid phase transition, Ha-ras p21 Laue crystallography and structural changes during the photocycle of bacteriorhodopsin.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    [s.l.] : Nature Publishing Group
    Nature 262 (1976), S. 613-615 
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] Unfortunately both structural signs can be faulted, the electron microscopy because of the possibility of fixation or postfixation changes6, and the X-ray diffraction because of the long time which was used to obtain the required exposures2,4. We have tried to overcome these objections by observing ...
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 4
    ISSN: 1399-0047
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik
    Notizen: The parameters affecting the crystal quality of complexes between p21H-ras and caged GTP have been investigated. The use of pure diastereomers of caged GTP complexed to the more stable p21(G12P)′ mutant of p21 and the addition of n-octyl-β-D-glucopyranoside improved the reproducibility and decreased the mosaicity of the crystals significantly. Furthermore, the crystallization technique was changed from the batch method to the sitting-drop technique. With the availability of a larger yield of well ordered crystals, it was possible to extend the time-resolved crystallographic investigations on p21H-ras. A structure of p21(G12P)′:GTP could be obtained 2 min after photolytic removal of the cage group and led to the identification of a previously unidentified conformation for the so-called catalytically active loop L4. The refinement of five data sets collected within 2 min at different times (2–4, 11–13, 20–22, 30–32 and 90–92 min) after the initiation of the intrinsic GTPase reaction of the protein indicates that the synchrotron Laue method can be used to detect small structural changes and alternative conformations, but is presently limited in the analysis of larger rearrangements since these produce diffuse and broken electron density.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 5
    Digitale Medien
    Digitale Medien
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 50 (1994), S. 521-526 
    ISSN: 1399-0047
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik
    Notizen: p21 is a small guanine nucleotide binding protein that is involved in intracellular signal transduction. Biochemical data suggest that the presence of the β-phosphate is essential for strong binding of guanine nucleotides to the protein. Guanosine or GMP bind six orders of magnitude more weakly to p21 than GDP or GTP. Moreover, the thermal stability of the protein is dramatically reduced when bound to GMP or guanosine. We have crystallized C-terminally truncated forms of p21H-ras, with guanosine or GMP bound, in the space groups P43212, P21212 and P21. The crystals diffract in the range 2.8–2.2 Å. Details of the crystallization procedures, the characterization of the crystals and preliminary results of structure determination are described. An unexpected electron-density peak was found close to the position of the β-phosphate in the phosphate-binding loop.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 6
    Digitale Medien
    Digitale Medien
    Springer
    Journal of molecular medicine 53 (1975), S. 617-622 
    ISSN: 1432-1440
    Schlagwort(e): Tissue damage ; enzyme elimination ; enzyme tests ; Gewebsschädigungen ; Enzymelimination ; Enzymtests
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Beschreibung / Inhaltsverzeichnis: Zusammenfassung 1. Adenylatkinasen, kleine organspezifische Isoenzyme, die nach Zellschädigungen im Serum nachweisbar sind, werden teilweise durch die Niere eliminiert. Bei der Ratte erschienen nach Applikation von 3000 Enzymeinheiten14C-markierter Adenylatkinase (AK) innerhalb von 7 min etwa 50% cer Enzym- und der Radioaktivität im Urin. 2. Beim Menschen erfolgt die Elimination von AK aus dem Plasma in zwei Phasen, einer schnelleren (Halbwertszeit 16 min) und einer langsameren (Halbwertszeit 160 min). Ein Teil der in Selbstversuchen injizierten Enzymaktivität ließ sich in wenigen Minuten im Urin nachweisen. Die potentielle Bedeutung von AK-Bestimmungen in Urin und Plasma für die Früh-und Rezidivdiagnostik des Herzinfarkts wird diskutiert. — Am Beispiel verschiedener Skeletmuskelerkrankungen werden Möglichkeiten gezeigt, die extrem rasche Elimination von AK aus dem Serum für Verlaufskontrollen auszunutzen. 3. Der kompetitive Inhibitor Diadenosinpentaphosphat (AP5A) hat eine sehr viel höhere Affinität zu den Adenylatkinasen aus Erythrocyten, Herz- und Skeletmuskel als zu den Isoenzymen aus Leber und Niere. AP5A kann deshalb zur Differentialbestimmung von Adenylatkinase-Isoenzymen im Plasma oder im Urin verwendet werden.
    Notizen: Summary Adenylate kinases, small organ-specific isoenzymes which appear after tissue damage in the blood plasma are partly eliminated via the kidney. After intravenous administration of 3000 enzyme units of14C-labelled adenylate kinase to rats, about 50% of the enzyme and of the radioactivity are found in the urine within 7 minutes. The elimination of adenylate kinase from the serum occurs in two phases, a faster (half-life 16 minutes) and a slower (half-life 160 minutes). After intravenous administration of adenylate kinase to humans, a part of the activity was recovered in the urine within minutes. The potential use of assaying adenylate kinase levels for early diagnosis of myocardial infarction is discussed. Using various skeletal muscle diseases as examples, the possible use of the very rapid elimination of adenylate kinase from the serum in monitoring the course of the acute illnesses is described. The competitive inhibitor diadenosine pentaphosphate (AP5A) has a much higher affinity for the adenylate kinases from erythrocytes, heart or skeletal muscle than for the isoenzymes from liver or kidney. Therefore, AP5A can be used for the differential determination of adenylate kinase isoenzymes in the blood plasma or the urine.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 7
    Digitale Medien
    Digitale Medien
    Springer
    Journal of muscle research and cell motility 12 (1991), S. 208-215 
    ISSN: 1573-2657
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Summary The specific feature of stretch activation of the indirect flight muscle of the tropical waterbugLethocerus was used to correlate mechanical and structural aspects of muscle contraction. The time courses of the changes in intensities of the strongest equatorial reflections, the (10) and (20) and of the first meridional reflection at 14.5 nm−1 were monitored using synchrotron radiation as a high intensity X-ray source. The ratio of the intensities of the equatorial reflections, (I20/I10), which reflects the mass distribution within the filament lattice array, increases by about 10% relative to the Ca2+-activated level when a rapid stretch is imposed, compared with a 200% change seen when fibres change from the relaxed to the rigor state, while the spacing of the lattice planes decreases by about 1%. The intensity of the first meridional reflection at 14.5 nm−1 decreases by about 35% during stretch activation with a slightly faster time course than the delayed tension increase. The results suggest that the average structure of cycling crossbridges is different from that present in the rigor state.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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