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  1. Article ; Online: A direct gateway into the extracellular space: Unconventional secretion of FGF2 through self-sustained plasma membrane pores.

    Steringer, Julia P / Nickel, Walter

    Seminars in cell & developmental biology

    2018  Volume 83, Page(s) 3–7

    Abstract: As illustrated by a diverse set of examples in this special issue, multiple mechanisms of protein secretion have been identified in eukaryotes that do not involve the endoplasmic reticulum (ER) and the Golgi apparatus. Here we focus on the type I pathway ...

    Abstract As illustrated by a diverse set of examples in this special issue, multiple mechanisms of protein secretion have been identified in eukaryotes that do not involve the endoplasmic reticulum (ER) and the Golgi apparatus. Here we focus on the type I pathway with Fibroblast Growth Factor 2 (FGF2) being the most prominent example. Unconventional secretion of FGF2 from cells is mediated by direct protein translocation across the plasma membrane. A unique feature of this process is the ability of FGF2 to form its own membrane translocation intermediate through oligomerization and membrane insertion. This process depends on the phosphoinositide PI(4,5)P
    MeSH term(s) Cell Membrane/metabolism ; Extracellular Space/metabolism ; Fibroblast Growth Factor 2/metabolism ; Humans
    Chemical Substances Fibroblast Growth Factor 2 (103107-01-3)
    Language English
    Publishing date 2018-03-05
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't ; Review
    ZDB-ID 1312473-0
    ISSN 1096-3634 ; 1084-9521
    ISSN (online) 1096-3634
    ISSN 1084-9521
    DOI 10.1016/j.semcdb.2018.02.010
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: The molecular mechanism underlying unconventional secretion of Fibroblast Growth Factor 2 from tumour cells.

    Steringer, Julia P / Nickel, Walter

    Biology of the cell

    2017  Volume 109, Issue 11, Page(s) 375–380

    Abstract: Fibroblast Growth Factor 2 (FGF2) is a potent cell survival factor involved in tumour-induced angiogenesis. FGF2 is secreted from cells through an unconventional secretory mechanism based upon direct translocation across the plasma membrane. The ... ...

    Abstract Fibroblast Growth Factor 2 (FGF2) is a potent cell survival factor involved in tumour-induced angiogenesis. FGF2 is secreted from cells through an unconventional secretory mechanism based upon direct translocation across the plasma membrane. The molecular mechanism underlying this process depends on a surprisingly small set of trans-acting factors that are physically associated with the plasma membrane. FGF2 membrane translocation is mediated by the ability of FGF2 to oligomerise and to insert into the plasma membrane in a PI(4,5)P
    Language English
    Publishing date 2017-11
    Publishing country England
    Document type Journal Article ; Review
    ZDB-ID 245745-3
    ISSN 1768-322X ; 0399-0311 ; 0248-4900
    ISSN (online) 1768-322X
    ISSN 0399-0311 ; 0248-4900
    DOI 10.1111/boc.201700036
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Determining the Functional Oligomeric State of Membrane-Associated Protein Oligomers Forming Membrane Pores on Giant Lipid Vesicles.

    Singh, Vandana / Macharová, Sabína / Riegerová, Petra / Steringer, Julia P / Müller, Hans-Michael / Lolicato, Fabio / Nickel, Walter / Hof, Martin / Šachl, Radek

    Analytical chemistry

    2023  Volume 95, Issue 23, Page(s) 8807–8815

    Abstract: Several peripheral membrane proteins are known to form membrane pores through multimerization. In many cases, in biochemical reconstitution experiments, a complex distribution of oligomeric states has been observed that may, in part, be irrelevant to ... ...

    Abstract Several peripheral membrane proteins are known to form membrane pores through multimerization. In many cases, in biochemical reconstitution experiments, a complex distribution of oligomeric states has been observed that may, in part, be irrelevant to their physiological functions. This phenomenon makes it difficult to identify the functional oligomeric states of membrane lipid interacting proteins, for example, during the formation of transient membrane pores. Using fibroblast growth factor 2 (FGF2) as an example, we present a methodology applicable to giant lipid vesicles by which functional oligomers can be distinguished from nonspecifically aggregated proteins without functionality. Two distinct populations of fibroblast growth factor 2 were identified with (i) dimers to hexamers and (ii) a broad population of higher oligomeric states of membrane-associated FGF2 oligomers significantly distorting the original unfiltered histogram of all detectable oligomeric species of FGF2. The presented statistical approach is relevant for various techniques for characterizing membrane-dependent protein oligomerization.
    MeSH term(s) Cell Membrane/metabolism ; Membrane Proteins/metabolism ; Fibroblast Growth Factor 2/metabolism ; Membranes ; Lipids ; Protein Multimerization
    Chemical Substances Membrane Proteins ; Fibroblast Growth Factor 2 (103107-01-3) ; Lipids
    Language English
    Publishing date 2023-05-06
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 1508-8
    ISSN 1520-6882 ; 0003-2700
    ISSN (online) 1520-6882
    ISSN 0003-2700
    DOI 10.1021/acs.analchem.2c05692
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Determining the Functional Oligomeric State of Membrane-Associated Protein Oligomers Forming Membrane Pores on Giant Lipid Vesicles

    Singh, Vandana / Macharová, Sabína / Riegerová, Petra / Steringer, Julia P. / Müller, Hans-Michael / Lolicato, Fabio / Nickel, Walter / Hof, M. / Šachl, Radek

    Analytical Chemistry. 2023 May 06, v. 95, no. 23 p.8807-8815

    2023  

    Abstract: Several peripheral membrane proteins are known to form membrane pores through multimerization. In many cases, in biochemical reconstitution experiments, a complex distribution of oligomeric states has been observed that may, in part, be irrelevant to ... ...

    Abstract Several peripheral membrane proteins are known to form membrane pores through multimerization. In many cases, in biochemical reconstitution experiments, a complex distribution of oligomeric states has been observed that may, in part, be irrelevant to their physiological functions. This phenomenon makes it difficult to identify the functional oligomeric states of membrane lipid interacting proteins, for example, during the formation of transient membrane pores. Using fibroblast growth factor 2 (FGF2) as an example, we present a methodology applicable to giant lipid vesicles by which functional oligomers can be distinguished from nonspecifically aggregated proteins without functionality. Two distinct populations of fibroblast growth factor 2 were identified with (i) dimers to hexamers and (ii) a broad population of higher oligomeric states of membrane-associated FGF2 oligomers significantly distorting the original unfiltered histogram of all detectable oligomeric species of FGF2. The presented statistical approach is relevant for various techniques for characterizing membrane-dependent protein oligomerization.
    Keywords analytical chemistry ; fibroblast growth factor 2 ; lipids ; membrane proteins ; oligomerization ; protein subunits ; statistical analysis
    Language English
    Dates of publication 2023-0506
    Size p. 8807-8815.
    Publishing place American Chemical Society
    Document type Article ; Online
    ZDB-ID 1508-8
    ISSN 1520-6882 ; 0003-2700
    ISSN (online) 1520-6882
    ISSN 0003-2700
    DOI 10.1021/acs.analchem.2c05692
    Database NAL-Catalogue (AGRICOLA)

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  5. Article ; 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  Volume 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 term(s) Extracellular Space ; Dimerization ; Fibroblast Growth Factor 2 ; Sodium-Potassium-Exchanging ATPase ; Disulfides
    Chemical Substances Fibroblast Growth Factor 2 (103107-01-3) ; Sodium-Potassium-Exchanging ATPase (EC 7.2.2.13) ; Disulfides
    Language English
    Publishing date 2024-01-22
    Publishing country England
    Document type Journal Article
    ZDB-ID 2687154-3
    ISSN 2050-084X ; 2050-084X
    ISSN (online) 2050-084X
    ISSN 2050-084X
    DOI 10.7554/eLife.88579
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: Unconventional secretion of fibroblast growth factor 2--a novel type of protein translocation across membranes?

    Steringer, Julia P / Müller, Hans-Michael / Nickel, Walter

    Journal of molecular biology

    2015  Volume 427, Issue 6 Pt A, Page(s) 1202–1210

    Abstract: N-terminal signal peptides are a hallmark of the vast majority of soluble secretory proteins that are transported along the endoplasmic reticulum/Golgi-dependent pathway. They are recognized by signal recognition particle, a process that initiates ... ...

    Abstract N-terminal signal peptides are a hallmark of the vast majority of soluble secretory proteins that are transported along the endoplasmic reticulum/Golgi-dependent pathway. They are recognized by signal recognition particle, a process that initiates membrane translocation into the lumen of the endoplasmic reticulum followed by vesicular transport to the cell surface and release into the extracellular space. Beyond this well-established mechanism of protein secretion from eukaryotic cells, a number of extracellular proteins with critical physiological functions in immune surveillance and tissue organization are known to be secreted in a manner independent of signal recognition particle. Such processes have collectively been termed "unconventional protein secretion" and, while known for more than two decades, their underlying mechanisms are only beginning to emerge. Different types of unconventional secretory mechanisms have been described with the best-characterized example being based on direct translocation of cytoplasmic proteins across plasma membranes. The aim of this review is to critically assess our current knowledge of this type of unconventional secretion focusing on fibroblast growth factor 2 (FGF2) as the most established example.
    MeSH term(s) Animals ; Cell Membrane/metabolism ; Fibroblast Growth Factor 2/metabolism ; Humans ; Phosphoinositide Phospholipase C/metabolism ; Protein Multimerization ; Protein Transport
    Chemical Substances Fibroblast Growth Factor 2 (103107-01-3) ; Phosphoinositide Phospholipase C (EC 3.1.4.11)
    Language English
    Publishing date 2015-03-27
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't ; Review
    ZDB-ID 80229-3
    ISSN 1089-8638 ; 0022-2836
    ISSN (online) 1089-8638
    ISSN 0022-2836
    DOI 10.1016/j.jmb.2014.07.012
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article ; Online: Functional Assay to Correlate Protein Oligomerization States with Membrane Pore Formation.

    Šachl, Radek / Čujová, Sabína / Singh, Vandana / Riegerová, Petra / Kapusta, Peter / Müller, Hans-Michael / Steringer, Julia P / Hof, Martin / Nickel, Walter

    Analytical chemistry

    2020  Volume 92, Issue 22, Page(s) 14861–14866

    Abstract: In-membrane oligomerization is decisive for the function (or dysfunction) of many proteins. Techniques were developed to characterize membrane-inserted oligomers and the hereby obtained oligomerization states were intuitively related to the function of ... ...

    Abstract In-membrane oligomerization is decisive for the function (or dysfunction) of many proteins. Techniques were developed to characterize membrane-inserted oligomers and the hereby obtained oligomerization states were intuitively related to the function of these proteins. However, in many cases, it is unclear whether the obtained oligomerization states are functionally relevant or are merely the consequence of nonspecific aggregation. Using fibroblast growth factor 2 (FGF2) as a model system, we addressed this methodological challenge. FGF2 oligomerizes in a PI(4,5)P
    MeSH term(s) Cell Membrane/chemistry ; Cell Membrane/metabolism ; Fibroblast Growth Factor 2/chemistry ; Fibroblast Growth Factor 2/metabolism ; Permeability ; Porosity ; Protein Multimerization ; Protein Structure, Quaternary ; Spectrometry, Fluorescence ; Unilamellar Liposomes/chemistry ; Unilamellar Liposomes/metabolism
    Chemical Substances Unilamellar Liposomes ; Fibroblast Growth Factor 2 (103107-01-3)
    Language English
    Publishing date 2020-10-14
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 1508-8
    ISSN 1520-6882 ; 0003-2700
    ISSN (online) 1520-6882
    ISSN 0003-2700
    DOI 10.1021/acs.analchem.0c03276
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  8. Article: Unconventional Secretion of Fibroblast Growth Factor 2—A Novel Type of Protein Translocation across Membranes?

    Steringer, Julia P / Hans-Michael Müller / Walter Nickel

    Journal of Molecular Biology. 2015 Mar. 27, v. 427

    2015  

    Abstract: N-terminal signal peptides are a hallmark of the vast majority of soluble secretory proteins that are transported along the endoplasmic reticulum/Golgi-dependent pathway. They are recognized by signal recognition particle, a process that initiates ... ...

    Abstract N-terminal signal peptides are a hallmark of the vast majority of soluble secretory proteins that are transported along the endoplasmic reticulum/Golgi-dependent pathway. They are recognized by signal recognition particle, a process that initiates membrane translocation into the lumen of the endoplasmic reticulum followed by vesicular transport to the cell surface and release into the extracellular space. Beyond this well-established mechanism of protein secretion from eukaryotic cells, a number of extracellular proteins with critical physiological functions in immune surveillance and tissue organization are known to be secreted in a manner independent of signal recognition particle. Such processes have collectively been termed “unconventional protein secretion” and, while known for more than two decades, their underlying mechanisms are only beginning to emerge. Different types of unconventional secretory mechanisms have been described with the best-characterized example being based on direct translocation of cytoplasmic proteins across plasma membranes. The aim of this review is to critically assess our current knowledge of this type of unconventional secretion focusing on fibroblast growth factor 2 (FGF2) as the most established example.
    Keywords endoplasmic reticulum ; eukaryotic cells ; extracellular space ; fibroblast growth factor 2 ; monitoring ; plasma membrane ; protein secretion ; protein transport ; proteins ; signal peptide
    Language English
    Dates of publication 2015-0327
    Size p. 1202-1210.
    Publishing place Elsevier Ltd
    Document type Article
    ZDB-ID 80229-3
    ISSN 1089-8638 ; 0022-2836
    ISSN (online) 1089-8638
    ISSN 0022-2836
    DOI 10.1016/j.jmb.2014.07.012
    Database NAL-Catalogue (AGRICOLA)

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  9. Article ; Online: The Na,K-ATPase acts upstream of phosphoinositide PI(4,5)P

    Legrand, Cyril / Saleppico, Roberto / Sticht, Jana / Lolicato, Fabio / Müller, Hans-Michael / Wegehingel, Sabine / Dimou, Eleni / Steringer, Julia P / Ewers, Helge / Vattulainen, Ilpo / Freund, Christian / Nickel, Walter

    Communications biology

    2020  Volume 3, Issue 1, Page(s) 141

    Abstract: FGF2 is a tumor cell survival factor that is exported from cells by an ER/Golgi-independent secretory pathway. This unconventional mechanism of protein secretion is based on direct translocation of FGF2 across the plasma membrane. The Na,K-ATPase has ... ...

    Abstract FGF2 is a tumor cell survival factor that is exported from cells by an ER/Golgi-independent secretory pathway. This unconventional mechanism of protein secretion is based on direct translocation of FGF2 across the plasma membrane. The Na,K-ATPase has previously been shown to play a role in this process, however, the underlying mechanism has remained elusive. Here, we define structural elements that are critical for a direct physical interaction between FGF2 and the α1 subunit of the Na,K-ATPase. In intact cells, corresponding FGF2 mutant forms were impaired regarding both recruitment at the inner plasma membrane leaflet and secretion. Ouabain, a drug that inhibits both the Na,K-ATPase and FGF2 secretion, was found to impair the interaction of FGF2 with the Na,K-ATPase in cells. Our findings reveal the Na,K-ATPase as the initial recruitment factor for FGF2 at the inner plasma membrane leaflet being required for efficient membrane translocation of FGF2 to cell surfaces.
    MeSH term(s) Animals ; CHO Cells ; Cell Membrane/enzymology ; Cricetulus ; Fibroblast Growth Factor 2/chemistry ; Fibroblast Growth Factor 2/genetics ; Fibroblast Growth Factor 2/metabolism ; Molecular Docking Simulation ; Molecular Dynamics Simulation ; Phosphatidylinositol 4,5-Diphosphate/metabolism ; Protein Binding ; Protein Interaction Domains and Motifs ; Protein Transport ; Second Messenger Systems ; Secretory Pathway ; Sodium-Potassium-Exchanging ATPase/chemistry ; Sodium-Potassium-Exchanging ATPase/genetics ; Sodium-Potassium-Exchanging ATPase/metabolism
    Chemical Substances Phosphatidylinositol 4,5-Diphosphate ; Fibroblast Growth Factor 2 (103107-01-3) ; ATP1A1 protein, human (EC 3.6.1.-) ; Sodium-Potassium-Exchanging ATPase (EC 7.2.2.13)
    Language English
    Publishing date 2020-03-25
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't ; Video-Audio Media
    ISSN 2399-3642
    ISSN (online) 2399-3642
    DOI 10.1038/s42003-020-0871-y
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article ; Online: HIV-Tat Protein Forms Phosphoinositide-dependent Membrane Pores Implicated in Unconventional Protein Secretion.

    Zeitler, Marcel / Steringer, Julia P / Müller, Hans-Michael / Mayer, Matthias P / Nickel, Walter

    The Journal of biological chemistry

    2015  Volume 290, Issue 36, Page(s) 21976–21984

    Abstract: HIV-Tat has been demonstrated to be secreted from cells in a phosphatidylinositol 4,5-bisphosphate (PI(4,5)P2)-dependent manner. Here we show that HIV-Tat forms membrane-inserted oligomers, a process that is accompanied by changes in secondary structure ... ...

    Abstract HIV-Tat has been demonstrated to be secreted from cells in a phosphatidylinositol 4,5-bisphosphate (PI(4,5)P2)-dependent manner. Here we show that HIV-Tat forms membrane-inserted oligomers, a process that is accompanied by changes in secondary structure with a strong increase in antiparallel β sheet content. Intriguingly, oligomerization of HIV-Tat on membrane surfaces leads to the formation of membrane pores, as demonstrated by physical membrane passage of small fluorescent tracer molecules. Although membrane binding of HIV-Tat did not strictly depend on PI(4,5)P2 but, rather, was mediated by a range of acidic membrane lipids, a functional interaction between PI(4,5)P2 and HIV-Tat was critically required for efficient membrane pore formation by HIV-Tat oligomers. These properties are strikingly similar to what has been reported previously for fibroblast growth factor 2 (FGF2), providing strong evidence of a common core mechanism of unconventional secretion shared by HIV-Tat and fibroblast growth factor 2.
    MeSH term(s) Cell Membrane/metabolism ; Cell Membrane/virology ; Electrophoresis, Polyacrylamide Gel ; Fibroblast Growth Factor 2/chemistry ; Fibroblast Growth Factor 2/metabolism ; Humans ; Lipid Bilayers/metabolism ; Liposomes/metabolism ; Mutation ; Phosphatidylinositol 4,5-Diphosphate/metabolism ; Phosphatidylinositols/metabolism ; Protein Binding ; Protein Conformation ; Protein Multimerization ; Protein Structure, Secondary ; Protein Transport ; Spectroscopy, Fourier Transform Infrared ; tat Gene Products, Human Immunodeficiency Virus/chemistry ; tat Gene Products, Human Immunodeficiency Virus/genetics ; tat Gene Products, Human Immunodeficiency Virus/metabolism
    Chemical Substances Lipid Bilayers ; Liposomes ; Phosphatidylinositol 4,5-Diphosphate ; Phosphatidylinositols ; tat Gene Products, Human Immunodeficiency Virus ; Fibroblast Growth Factor 2 (103107-01-3)
    Language English
    Publishing date 2015-07-16
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2997-x
    ISSN 1083-351X ; 0021-9258
    ISSN (online) 1083-351X
    ISSN 0021-9258
    DOI 10.1074/jbc.M115.667097
    Database MEDical Literature Analysis and Retrieval System OnLINE

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