Phosphatidylethanolamine is the precursor of the ethanolamine phosphoglycerol moiety bound to eukaryotic elongation factor 1A

In addition to its conventional role during protein synthesis, eukaryotic elongation factor 1A is involved in other cellular processes. Several regions of interaction between eukaryotic elongation factor 1A and the translational apparatus or the cytoskeleton have been identified, yet the roles of the different post-translational modifications of eukaryotic elongation factor 1A are completely unknown. One amino acid modification, which so far has only been found in eukaryotic elongation factor 1A, consists of ethanolamine-phosphoglycerol attached to two glutamate residues that are conserved between mammals and plants. We now report that ethanolamine-phosphoglycerol is also present in eukaryotic elongation factor 1A of the protozoan parasite Trypanosoma brucei, indicating that this unique protein modification is of ancient origin. In addition, using RNA-mediated gene silencing against enzymes of the Kennedy pathway, we demonstrate that phosphatidylethanolamine is a direct precursor of the ethanolamine-phosphoglycerol moiety. Down-regulation of the expression of ethanolamine kinase and ethanolamine-phosphate cytidylyltransferase results in inhibition of phosphatidylethanolamine synthesis in T. brucei procyclic forms and, concomitantly, in a block in glycosylphosphatidylinositol attachment to procyclins and ethanolamine-phosphoglycerol modification of eukaryotic elongation factor 1A.

N-terminal aromatic residues closely impact the cytolytic activity of cupiennin 1a, a major spider venom peptide

Cupiennins are small cationic a-helical peptides from the venom of the ctenid spider Cupiennius salei which are characterized by high bactericidal as well as hemolytic activities. To gain insight into the determinants responsible for the broad cytolytic activities, two analogues of cupiennin 1a with different N-terminal hydrophobicities were designed. The insecticidal, bactericidal and hemolytic activities of these analogues were assayed and compared to the native peptide. Specifically, substitution of two N-terminal Phe residues by Ala results in less pronounced insecticidal and cytolytic activity, whereas a substitution by Lys reduces strongly its bactericidal activity and completely diminishes its hemolytic activity up to very high tested concentrations. Biophysical analyses of peptide/bilayer membrane interactions point to distinct interactions of the analogues with lipid bilayers, and dependence upon membrane surface charge. Indeed, we find that lower hemolytic activity was correlated with less surface association of the analogues. In contrast, our data indicate that the reduced bactericidal activity of the two cupiennin 1a analogues likely correspond to greater bilayer-surface localization of the peptides. Overall, ultimate insertion and destruction of the host cell membrane is highly dependent on the presence of Phe-2 and Phe-6 (Cu 1a) or Leu-6 (Cu 2a) in the N-terminal sequences of native cupiennins.

Responses to rapid warming at Termination 1a at Gerzensee (Central Europe): Primary succession, albedo, soils, lake development, and ecological interactions

The transition from the Oldest Dryas to the Bølling around 14,685 cal yr BP was a period of extremely rapid climatic warming. From a single core of lake marl taken at Gerzensee (Switzerland) we studied the transition in stable isotopes of oxygen and carbon on bulk sediment and charophyte remains, as well as on monospecific samples of ostracods, after Pisidium a; in addition pollen, chironomids, and Cladocera were analyzed. The δ18O record serves as an estimate of mean air temperature, and by correlation to the one from NGRIP in Greenland it provides a timescale. The timing of responses: The statistically significant zone boundaries of the biostratigraphies are telescoped at the rapid increase of about 3‰ in δ18O at the onset of Bølling. Biotic responses may have occurred within sampling resolution (8 to 16 years), although younger zone boundaries are less synchronous. Gradual and longer-lasting responses include complex processes such as primary or secular succession. During the late-glacial interstadial of Bølling and Allerød, two stronger and two weaker cool phases were found. Biological processes involved in the responses occurred on levels of individuals (e.g. pollen productivity), of populations (increases or decreases, immigration, or extinction), and on the ecosystem level (species interactions such as facilitation or competition). Abiotic and biotic interactions include pedogenesis, nitrogen-fixation, nutrient cycling, catchment hydrology, water chemistry of the lake and albedo (controlled by the transition from tundra to forest). For the Swiss Plateau this major change in vegetation induced a change in the mammal fauna, which in turn led to changes in the tool-making by Paleolithic people.

Die Handschriften der Stadt- und Universitätsbibliothek Frankfurt am Main : (Fortsetzung von Teil 1A)

beschr. von Ernst Róth und Leo Prijs

Na 1 Nachlass Max Horkheimer, 661 - Berichte über die Arbeit des Instituts für Sozialforschung, "Research-Project on Anti-Semitism" u.a. (p. IX 78-IX 92.1a)

"Institut für Sozialforschung: Research Projects", Tabellarische Zusammenstellung (Juni 1953), Typoskript, 2 Blatt; "Institut für Sozialforschung an der Johann Wolfgang Goethe-Universität Frankfurt, Germany: Memorandum" (1953), a) Typoskript, 12 Blatt, b) Typoskript, 13 Blatt; "Projects of the Institute for Social Research" (1.7.1954), Typoskript, 5 Blatt; "Institut für Soziaforschung: Mitteilungen an die Presse" (November 1955), als Typoskript vervielfältigt, 6 Blatt; Clark: "Institut für Sozialforschung an der Johann Wolfgang Goethe-Universität in Frankfurt am Main" (etwa 1955), Typoskript, englisch, mit handschriftlichen Korrekturen, unter anderem von Max Horkheimer, 2 Blatt; "Institut für Sozialforschung" (6.3.1958), a) als Typoskript vervielfältigt, 10 Blatt, b) Typoskript, 22 Blatt, c) Kurzfassung, Typoskript, 3 Blatt, d) Teilstück, Typoskript, 1 Blatt, e) Sonderdruck, 15 Seiten; Abgeschlossene und laufende Arbeiten des Instituts. Tabellarische Zusammenstellung (1958?), Typoskript, 1 Blatt; "Laufende Studien" Tabellarische Aufstellung (25.5.1961), Typoskript, 1 Blatt; Friedrich Pollock (?): Anmerkungen zu Paul Klukes Darstellung des Instituts für Sozialforschung in dessen "Geschichte der Frankfurter Universität" (8.9.1969), Typoskript mit handschriftlichen Korrekturen, 4 Blatt; Theodor W. Adorno: Über die Arbeiten des Instituts für Sozialforschung (Datierung unklar, etwa 1941-45), Teilstück eines Entwurfs, Typoskript mit eigenhändiger Korrektur, 2 Blatt; Über die wesentliche Aufgabe des Instituts: Vereinigung geisteswissenschaftlicher und empirischer Methoden (Datierung unklar), Typoskript, 1 Blatt; "Forschungsprojekte des Instituts" (Datierung unklar, etwa 1950), Typoskript mit handschriftlichen Ergänzungen von Friedrich Pollock, 5 Blatt; "Vorträge im Institut für Sozialforschung. Einladungen und tabellarische Aufstellungen" (1953 u.a.), 5 Blatt; "Vorlesungen und Übungen im Institut für Sozialforschung, Ankündigungen aus den Jahren 1952-64, 9 Blatt; "International Institute of Social Research: Research-Project on Anti-Semitism" (1939-42) (veröffentlicht in Studies in Philosophy and Social Science Bd. IX, 1941, S. 124-143): 1. "Research Project on Anti-Semitism", a) Typoskript, 45 Blatt;

Na 1 Nachlass Max Horkheimer, 695 - "The Collapse of German Democracy and the Expansion of National Socialism", "Cultural Aspects of National Socialism" u.a. (p. IX 169.1a - IX 170.1-4)

"The Collapse of German Democracy and the Expansion of National Socialism" (1940):; 1. Darstellung des Forschungsprojekts (15.9.1940), b. Typoskript mit handschriftlichen Korrekturen, 78 Blatt; 2. "Research work on recent trends in the history of ideas (parts of the Research project on the Collapse of German Democracy would be included)". Als Memorandum zur Eröffnung zur Eröffnung einer Zweigstelle des Instituts in Los Angeles (12.12.1940): a) Typoskript, 2 Blatt, b) Teilstück, Typoskript mit handschriftlichen Korrekturen, 1 Blatt, c) Teilstück, Typoskript mit handschriftlichen Korrekturen, 1 Blatt, d) Teilstück, Typoskript, 1 Blatt, e) Teilstück, Typoskript, 1 Blatt, f) Entwurf, Typoskript mit handschriftlichen Korrekturen und Manuskript, 3 Blatt; 3. University of California, Los Angeles: 2 Briefe (Abschrift) von Max Horkheimer, o.O., 1940, 2 Briefe (Abschrift) an Max Horkheimer, 1940, 2 Blatt; A.R.L. Gurland: "Survey of Structural Changes in the German Economy, 1933 to 1939. Technological Bases and Organizational Forms of the National Socialist Economic System". Typoskript mit handschriftlichen Korrekturen unter anderem von Theodor W. Adorno, 48 Blatt (formal nicht identisch mit "Technological Trends and Economic Structure under National Socialism", Studies in Philosophy and Social Science, Bd. IX, 1941, S. 226ff.); "Cultural Aspects of National Socialism. A Research Project" (1941):; 1. Institute of Social Research: Mitteilung über das Forschungsprojekt und das 'Supplementary Statement', Typoskript, englisch, 4 Blatt; 2. Supplementary Statement to the Research Project, a) Typoskript, 14.4.1941, 63 Blatt, b) Typoskript, 12.4.1941, mit handschriftlichen Korrekturen, 35 Blatt; 3. "Cultural Aspects of National Socialism. A Research Project" (24.2.1941), a) als Typoskript vervielfältigt, 54 Blatt, b) Typoskript mit handschriftlichen Korrekturen, 34 Blatt, c) Fassung Januar 1941, Typoskript mit handschriftlichen Korrekturen, 40 Blatt; 4. Inhaltsverzeichnisse, mit handschriftlichen Korrekturen, 3 Blatt;