Dynamics of membrane nanotubes coated with I-BAR
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Dynamics of membrane nanotubes coated with I-BAR. / Farhangibarooji, Younes; Rørvig-Lund, Andreas; Semsey, Szabolcs; S. Reihani, S. Nader; Bendix, Pól Martin.
In: Scientific Reports, Vol. 6, 30054, 2016.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Dynamics of membrane nanotubes coated with I-BAR
AU - Farhangibarooji, Younes
AU - Rørvig-Lund, Andreas
AU - Semsey, Szabolcs
AU - S. Reihani, S. Nader
AU - Bendix, Pól Martin
PY - 2016
Y1 - 2016
N2 - Membrane deformation is a necessary step in a number of cellular processes such as filopodia and invadopodia formation and has been shown to involve membrane shaping proteins containing membrane binding domains from the IRSp53-MIM protein family. In reconstituted membranes the membrane shaping domains can efficiently deform negatively charged membranes into tubules without any other proteins present. Here, we show that the IM domain (also called I-BAR domain) from the protein ABBA, forms semi-flexible nanotubes protruding into Giant Unilamellar lipid Vesicles (GUVs). By simultaneous quantification of tube intensity and tubular shape we find both the diameter and stiffness of the nanotubes. I-BAR decorated tubes were quantified to have a diameter of ~50 nm and exhibit no stiffening relative to protein free tubes of the same diameter. At high protein density the tubes are immobile whereas at lower density the tubes diffuse freely on the surface of the GUV. Bleaching experiments of the fluorescently tagged I-BAR confirmed that the mobility of the tubes correlates with the mobility of the I-BAR on the GUV membrane. Finally, at low density of I-BAR the protein upconcentrates within tubes protruding into the GUVs. This implies that I-BAR exhibits strong preference for negatively curved membranes.
AB - Membrane deformation is a necessary step in a number of cellular processes such as filopodia and invadopodia formation and has been shown to involve membrane shaping proteins containing membrane binding domains from the IRSp53-MIM protein family. In reconstituted membranes the membrane shaping domains can efficiently deform negatively charged membranes into tubules without any other proteins present. Here, we show that the IM domain (also called I-BAR domain) from the protein ABBA, forms semi-flexible nanotubes protruding into Giant Unilamellar lipid Vesicles (GUVs). By simultaneous quantification of tube intensity and tubular shape we find both the diameter and stiffness of the nanotubes. I-BAR decorated tubes were quantified to have a diameter of ~50 nm and exhibit no stiffening relative to protein free tubes of the same diameter. At high protein density the tubes are immobile whereas at lower density the tubes diffuse freely on the surface of the GUV. Bleaching experiments of the fluorescently tagged I-BAR confirmed that the mobility of the tubes correlates with the mobility of the I-BAR on the GUV membrane. Finally, at low density of I-BAR the protein upconcentrates within tubes protruding into the GUVs. This implies that I-BAR exhibits strong preference for negatively curved membranes.
KW - Journal Article
U2 - 10.1038/srep30054
DO - 10.1038/srep30054
M3 - Journal article
C2 - 27444356
VL - 6
JO - Scientific Reports
JF - Scientific Reports
SN - 2045-2322
M1 - 30054
ER -
ID: 178251616