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  1. AU="Klein, Steffen"
  2. AU="Koike, Toru"
  3. AU="Hung, Chung-Yu"
  4. AU="Muendlein, Hayley I"
  5. AU="Papavramidis, Theodosios"

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  1. Buch ; Online ; Dissertation / Habilitation: In situ cryo-correlative light and electron tomography of influenza A virus entry and its inhibition by IFITM3

    Klein, Steffen [Verfasser] / Kräusslich, Hans-Georg [Akademischer Betreuer]

    2023  

    Verfasserangabe Steffen Klein ; Betreuer: Hans-Georg Kräusslich
    Schlagwörter Naturwissenschaften ; Science
    Thema/Rubrik (Code) sg500
    Sprache Englisch
    Verlag Universitätsbibliothek Heidelberg
    Erscheinungsort Heidelberg
    Dokumenttyp Buch ; Online ; Dissertation / Habilitation
    Datenquelle Digitale Dissertationen im Internet

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  2. Artikel ; Online: Post-correlation on-lamella cryo-CLEM reveals the membrane architecture of lamellar bodies.

    Klein, Steffen / Wimmer, Benedikt H / Winter, Sophie L / Kolovou, Androniki / Laketa, Vibor / Chlanda, Petr

    Communications biology

    2021  Band 4, Heft 1, Seite(n) 137

    Abstract: Lamellar bodies (LBs) are surfactant-rich organelles in alveolar cells. LBs disassemble into a lipid-protein network that reduces surface tension and facilitates gas exchange in the alveolar cavity. Current knowledge of LB architecture is predominantly ... ...

    Abstract Lamellar bodies (LBs) are surfactant-rich organelles in alveolar cells. LBs disassemble into a lipid-protein network that reduces surface tension and facilitates gas exchange in the alveolar cavity. Current knowledge of LB architecture is predominantly based on electron microscopy studies using disruptive sample preparation methods. We established and validated a post-correlation on-lamella cryo-correlative light and electron microscopy approach for cryo-FIB milled cells to structurally characterize and validate the identity of LBs in their unperturbed state. Using deconvolution and 3D image registration, we were able to identify fluorescently labeled membrane structures analyzed by cryo-electron tomography. In situ cryo-electron tomography of A549 cells as well as primary Human Small Airway Epithelial Cells revealed that LBs are composed of membrane sheets frequently attached to the limiting membrane through "T"-junctions. We report a so far undescribed outer membrane dome protein complex (OMDP) on the limiting membrane of LBs. Our data suggest that LB biogenesis is driven by parallel membrane sheet import and by the curvature of the limiting membrane to maximize lipid storage capacity.
    Mesh-Begriff(e) A549 Cells ; ATP-Binding Cassette Transporters/genetics ; ATP-Binding Cassette Transporters/metabolism ; Cryoelectron Microscopy ; Electron Microscope Tomography ; Green Fluorescent Proteins/genetics ; Green Fluorescent Proteins/metabolism ; Humans ; Image Interpretation, Computer-Assisted ; Imaging, Three-Dimensional ; Intracellular Membranes/ultrastructure ; Lung Neoplasms/genetics ; Lung Neoplasms/metabolism ; Lung Neoplasms/ultrastructure ; Organelles/metabolism ; Organelles/ultrastructure ; Pulmonary Alveoli/metabolism ; Pulmonary Alveoli/ultrastructure ; Pulmonary Surfactant-Associated Proteins/metabolism ; Recombinant Fusion Proteins/metabolism
    Chemische Substanzen ABCA3 protein, human ; ATP-Binding Cassette Transporters ; Pulmonary Surfactant-Associated Proteins ; Recombinant Fusion Proteins ; enhanced green fluorescent protein ; Green Fluorescent Proteins (147336-22-9)
    Sprache Englisch
    Erscheinungsdatum 2021-01-29
    Erscheinungsland England
    Dokumenttyp Journal Article ; Research Support, Non-U.S. Gov't ; Video-Audio Media
    ISSN 2399-3642
    ISSN (online) 2399-3642
    DOI 10.1038/s42003-020-01567-z
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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  3. Artikel: Cryo-correlative light and electron microscopy workflow for cryo-focused ion beam milled adherent cells.

    Klein, Steffen / Wachsmuth-Melm, Moritz / Winter, Sophie L / Kolovou, Androniki / Chlanda, Petr

    Methods in cell biology

    2021  Band 162, Seite(n) 273–302

    Abstract: In situ cryo-electron tomography of cryo-focused ion beam (cryo-FIB) milled cells enables the study of cellular organelles in unperturbed conditions and close to the molecular resolution. However, due to the crowdedness of the cellular environment, the ... ...

    Abstract In situ cryo-electron tomography of cryo-focused ion beam (cryo-FIB) milled cells enables the study of cellular organelles in unperturbed conditions and close to the molecular resolution. However, due to the crowdedness of the cellular environment, the identification of individual macromolecular complexes either on organelles or inside the cytosol in cryo-electron tomograms is challenging. Cryo-correlative light and electron microscopy (cryo-CLEM) employs a fluorescently labeled feature of interest imaged by cryo-light microscopy that is correlated to cryo-electron microscopy maps of cryo-FIB milled lamellae using correlation markers discernable by both imaging methods. Here, we provide a protocol for a post-correlation on-lamella cryo-CLEM approach for localization of fluorescently labeled organelles of interest in cryo-lamellae after cryo-FIB milling and tomography of adherent plunge frozen cells.
    Mesh-Begriff(e) Cryoelectron Microscopy ; Electron Microscope Tomography ; Electrons ; Ions ; Workflow
    Chemische Substanzen Ions
    Sprache Englisch
    Erscheinungsdatum 2021-02-17
    Erscheinungsland United States
    Dokumenttyp Journal Article ; Research Support, Non-U.S. Gov't
    ISSN 0091-679X
    ISSN 0091-679X
    DOI 10.1016/bs.mcb.2020.12.009
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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  4. Artikel ; Online: Disulfide bridge-dependent dimerization triggers FGF2 membrane translocation into the extracellular space.

    Lolicato, Fabio / Steringer, Julia P / Saleppico, Roberto / Beyer, Daniel / Fernandez-Sobaberas, Jaime / Unger, Sebastian / Klein, Steffen / Riegerová, Petra / Wegehingel, Sabine / Müller, Hans-Michael / Schmitt, Xiao J / Kaptan, Shreyas / Freund, Christian / Hof, Martin / Šachl, Radek / Chlanda, Petr / Vattulainen, Ilpo / Nickel, Walter

    eLife

    2024  Band 12

    Abstract: Fibroblast growth factor 2 (FGF2) exits cells by direct translocation across the plasma membrane, a type I pathway of unconventional protein secretion. This process is initiated by phosphatidylinositol-4,5-bisphosphate (PI(4,5) ... ...

    Abstract Fibroblast growth factor 2 (FGF2) exits cells by direct translocation across the plasma membrane, a type I pathway of unconventional protein secretion. This process is initiated by phosphatidylinositol-4,5-bisphosphate (PI(4,5)P
    Mesh-Begriff(e) Extracellular Space ; Dimerization ; Fibroblast Growth Factor 2 ; Sodium-Potassium-Exchanging ATPase ; Disulfides
    Chemische Substanzen Fibroblast Growth Factor 2 (103107-01-3) ; Sodium-Potassium-Exchanging ATPase (EC 7.2.2.13) ; Disulfides
    Sprache Englisch
    Erscheinungsdatum 2024-01-22
    Erscheinungsland England
    Dokumenttyp Journal Article
    ZDB-ID 2687154-3
    ISSN 2050-084X ; 2050-084X
    ISSN (online) 2050-084X
    ISSN 2050-084X
    DOI 10.7554/eLife.88579
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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  5. Buch ; Dissertation / Habilitation: Methode zur Kompensierung des Streulichtanteils bei der kontinulierlichen Modulationsinterferometrie

    Klein, Steffen

    (Leuphana-Universität Lüneburg, Institut für Produkt- und Prozessinnovation ; 2)

    2010  

    Verfasserangabe Steffen Klein
    Serientitel Leuphana-Universität Lüneburg, Institut für Produkt- und Prozessinnovation ; 2
    Schlagwörter Messunsicherheit ; Lichtmodulation ; Dreidimensionale Rekonstruktion ; Streulicht ; Optische Messung ; Kompensation ; Laufzeitmessung
    Sprache Deutsch
    Umfang XXII, 167 S., Ill., graph. Darst.
    Ausgabenhinweis 1. Aufl.
    Verlag Sierke
    Erscheinungsort Göttingen
    Dokumenttyp Buch ; Dissertation / Habilitation
    Dissertation / Habilitation Univ., Diss.--Lüneburg, 2010
    ISBN 9783868442885 ; 386844288X
    Datenquelle Katalog der Technische Informationsbibliothek Hannover

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  6. Buch ; Online ; Dissertation / Habilitation: Effekte von Enriched Environment auf strukturelle Veränderungen und Verhaltensdefizite nach neonatalen Läsionen des medialen präfrontalen Cortex bei Ratten

    Klein, Steffen

    2010  

    Abstract: Neonatal lesions, ventral medial prefrontal cortex, rat, enriched environment, behaviour, parvalbumin. - In contrast to adult lesions, the ventral medial prefrontal cortex (vmPFC) of rats regenerates after neonatal lesions on postnatal day (PND) 5-12. ... ...

    Verfasserangabe von Steffen Klein
    Abstract Neonatal lesions, ventral medial prefrontal cortex, rat, enriched environment, behaviour, parvalbumin. - In contrast to adult lesions, the ventral medial prefrontal cortex (vmPFC) of rats regenerates after neonatal lesions on postnatal day (PND) 5-12. The present study investigates whether high enriched environment housing conditions (HEE) can attenuate the behavioural deficits which are typically observed after neonatal lesions of the vmPFC. For this purpose rats received bilateral ibotenic acid injections into the vmPFC on PND 7. On PND 21 the rats were dived into a group housed in standard conditions, while the other group was housed in HEE, shamoperated and nai͏̈ve rats served as controls. While HEE attenuated the vmPFC-lesion induced working memory deficit in the 4-arms baited raialmaze task, and the perseveration behaviour in its reversal, it had no effect on the decreased unconditioned fear in the elevated plus maze. Also HEE seems to have beneficial effects on the performance of neonatal lesioned rats in the food-choice test. Additionally the present study was able to show, that neoatal lesions increase the number of parvalbumine immunoreactive cells in two brain regions interconnected with the vmPFC, namely the basolateral amygdala and the hippocampus.
    Sprache Deutsch
    Umfang Online-Ressource (PDF-Datei: 147 S., 3 MB)
    Verlag Staats- und Universitaetsbibliothek Host
    Erscheinungsort Bremen
    Dokumenttyp Buch ; Online ; Dissertation / Habilitation
    Dissertation / Habilitation Univ., Diss.--Bremen, 2010
    Datenquelle Katalog der Technische Informationsbibliothek Hannover

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  7. Buch ; Online ; Dissertation / Habilitation: Effekte von Enriched-Environment auf strukturelle Veränderungen und Verhaltensdefizite nach neonatalen Läsionen des medialen präfrontalen Cortex bei Ratten

    Klein, Steffen [Verfasser]

    2010  

    Verfasserangabe von Steffen Klein
    Schlagwörter Biowissenschaften, Biologie ; Life Science, Biology
    Thema/Rubrik (Code) sg570
    Sprache Deutsch
    Dokumenttyp Buch ; Online ; Dissertation / Habilitation
    Datenquelle Digitale Dissertationen im Internet

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  8. Artikel ; Online: IFITM3 blocks influenza virus entry by sorting lipids and stabilizing hemifusion.

    Klein, Steffen / Golani, Gonen / Lolicato, Fabio / Lahr, Carmen / Beyer, Daniel / Herrmann, Alexia / Wachsmuth-Melm, Moritz / Reddmann, Nina / Brecht, Romy / Hosseinzadeh, Mehdi / Kolovou, Androniki / Makroczyova, Jana / Peterl, Sarah / Schorb, Martin / Schwab, Yannick / Brügger, Britta / Nickel, Walter / Schwarz, Ulrich S / Chlanda, Petr

    Cell host & microbe

    2023  Band 31, Heft 4, Seite(n) 616–633.e20

    Abstract: Interferon-induced transmembrane protein 3 (IFITM3) inhibits the entry of numerous viruses through undefined molecular mechanisms. IFITM3 localizes in the endosomal-lysosomal system and specifically affects virus fusion with target cell membranes. We ... ...

    Abstract Interferon-induced transmembrane protein 3 (IFITM3) inhibits the entry of numerous viruses through undefined molecular mechanisms. IFITM3 localizes in the endosomal-lysosomal system and specifically affects virus fusion with target cell membranes. We found that IFITM3 induces local lipid sorting, resulting in an increased concentration of lipids disfavoring viral fusion at the hemifusion site. This increases the energy barrier for fusion pore formation and the hemifusion dwell time, promoting viral degradation in lysosomes. In situ cryo-electron tomography captured IFITM3-mediated arrest of influenza A virus membrane fusion. Observation of hemifusion diaphragms between viral particles and late endosomal membranes confirmed hemifusion stabilization as a molecular mechanism of IFITM3. The presence of the influenza fusion protein hemagglutinin in post-fusion conformation close to hemifusion sites further indicated that IFITM3 does not interfere with the viral fusion machinery. Collectively, these findings show that IFITM3 induces lipid sorting to stabilize hemifusion and prevent virus entry into target cells.
    Mesh-Begriff(e) Humans ; Influenza, Human/metabolism ; Virus Internalization ; Influenza A virus/metabolism ; Cell Membrane/metabolism ; Lipids ; Membrane Proteins/metabolism ; RNA-Binding Proteins/metabolism
    Chemische Substanzen Lipids ; IFITM3 protein, human ; Membrane Proteins ; RNA-Binding Proteins
    Sprache Englisch
    Erscheinungsdatum 2023-03-31
    Erscheinungsland United States
    Dokumenttyp Journal Article
    ZDB-ID 2278004-X
    ISSN 1934-6069 ; 1931-3128
    ISSN (online) 1934-6069
    ISSN 1931-3128
    DOI 10.1016/j.chom.2023.03.005
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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  9. Artikel ; Online: Post-correlation on-lamella cryo-CLEM reveals the membrane architecture of lamellar bodies

    Klein, Steffen / Wimmer, Benedikt H. / Winter, Sophie L. / Kolovou, Androniki / Laketa, Vibor / Chlanda, Petr

    bioRxiv

    Abstract: Lamellar bodies (LBs) are surfactant-rich organelles in alveolar cells. LBs disassemble into a lipid-protein network that reduces surface tension and facilitates gas exchange in the alveolar cavity. Current knowledge of LB architecture is predominantly ... ...

    Abstract Lamellar bodies (LBs) are surfactant-rich organelles in alveolar cells. LBs disassemble into a lipid-protein network that reduces surface tension and facilitates gas exchange in the alveolar cavity. Current knowledge of LB architecture is predominantly based on electron microscopy studies using disruptive sample preparation methods. We established and validated a post-correlation on-lamella cryo-correlative light and electron microscopy approach for cryo-FIB milled cells to structurally characterize and validate the identity of LBs in their unperturbed state. Using deconvolution and 3D image registration, we were able to identify fluorescently labeled membrane structures analyzed by cryo-electron tomography. In situ cryo-electron tomography of A549 cells as well as primary Human Small Airway Epithelial Cells revealed that LBs are composed of membrane sheets frequently attached to the limiting membrane through “T”-junctions. We report a so far undescribed outer membrane dome protein complex (OMDP) on the limiting membrane of LBs. Our data suggest that LB biogenesis is driven by parallel membrane sheet import and by the curvature of the limiting membrane to maximize lipid storage capacity.
    Schlagwörter covid19
    Verlag BioRxiv
    Dokumenttyp Artikel ; Online
    DOI 10.1101/2020.02.27.966739
    Datenquelle COVID19

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  10. Buch ; Dissertation / Habilitation: Differenz und Kohärenz

    Klein, Steffen

    Gestaltung und Wahrnehmung elektronischer Medien

    (Digital horizons ; 1)

    2001  

    Verfasserangabe Steffen Klein
    Serientitel Digital horizons ; 1
    Schlagwörter Produktgestaltung ; Neue Medien ; Visuelle Wahrnehmung ; Produktdifferenzierung
    Sprache Deutsch
    Umfang 340 S, graph. Darst, 24 cm
    Verlag SYNCHRON, Wiss.-Verl. der Autoren
    Erscheinungsort Heidelberg
    Dokumenttyp Buch ; Dissertation / Habilitation
    Dissertation / Habilitation Univ., Diss.--Wuppertal, 2000
    Anmerkung Literaturverz. S. [313] - 340
    ISBN 3935025181 ; 9783935025188
    Datenquelle Katalog der Technische Informationsbibliothek Hannover

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