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Directional K+ channel insertion in a single phospholipid bilayer: Neutron reflectometry and electrophysiology in the joint exploration of a model membrane functional platform

Rondelli, V. ; Favero, E. del ; Brocca, P. ; Fragneto, G. ; Trapp, M. ; Mauri, L. ; Ciampa, M. G. ; Romani, G. ; Braun, C. J. ; Winterstein, L. ; Schroeder, Indra ; Thiel, Gerhard ; Moroni, Anna ; Cantu', L. (2018)
Directional K+ channel insertion in a single phospholipid bilayer: Neutron reflectometry and electrophysiology in the joint exploration of a model membrane functional platform.
In: Biochimica et biophysica acta, 1862 (8)
Artikel, Bibliographie

Kurzbeschreibung (Abstract)

We investigated the insertion of small potassium (K) channel proteins (Kcv and Kcv) into model membranes and the lipid-protein structural interference, combining neutron reflectometry and electrophysiology. Neutron reflectometry experiments showed how the transverse structure and mechanical properties of the bilayer were modified, upon insertion of the proteins in single model-membranes, either supported on solid substrate or floating. Parallel electrophysiology experiments were performed on the same channels reconstituted in free-standing planar lipid bilayers, of both typical composition and matched to the neutron reflectometry experiment, assessing their electrical features. Functional and structural results converge in detecting that the proteins, conical in shape, insert with a directionality, cytosolic side first. Our work addresses the powerful combination of the two experimental approaches. We show here that membrane structure spectroscopy and ion channel electrophysiology can become synergistic tools in the analysis of structural-functional properties of biomimetic complex environment.

Typ des Eintrags: Artikel
Erschienen: 2018
Autor(en): Rondelli, V. ; Favero, E. del ; Brocca, P. ; Fragneto, G. ; Trapp, M. ; Mauri, L. ; Ciampa, M. G. ; Romani, G. ; Braun, C. J. ; Winterstein, L. ; Schroeder, Indra ; Thiel, Gerhard ; Moroni, Anna ; Cantu', L.
Art des Eintrags: Bibliographie
Titel: Directional K+ channel insertion in a single phospholipid bilayer: Neutron reflectometry and electrophysiology in the joint exploration of a model membrane functional platform
Sprache: Englisch
Publikationsjahr: August 2018
Titel der Zeitschrift, Zeitung oder Schriftenreihe: Biochimica et biophysica acta
Jahrgang/Volume einer Zeitschrift: 1862
(Heft-)Nummer: 8
Kurzbeschreibung (Abstract):

We investigated the insertion of small potassium (K) channel proteins (Kcv and Kcv) into model membranes and the lipid-protein structural interference, combining neutron reflectometry and electrophysiology. Neutron reflectometry experiments showed how the transverse structure and mechanical properties of the bilayer were modified, upon insertion of the proteins in single model-membranes, either supported on solid substrate or floating. Parallel electrophysiology experiments were performed on the same channels reconstituted in free-standing planar lipid bilayers, of both typical composition and matched to the neutron reflectometry experiment, assessing their electrical features. Functional and structural results converge in detecting that the proteins, conical in shape, insert with a directionality, cytosolic side first. Our work addresses the powerful combination of the two experimental approaches. We show here that membrane structure spectroscopy and ion channel electrophysiology can become synergistic tools in the analysis of structural-functional properties of biomimetic complex environment.

ID-Nummer: pmid:29753114
Fachbereich(e)/-gebiet(e): 10 Fachbereich Biologie
10 Fachbereich Biologie > Plant Membrane Biophyscis (am 20.12.23 umbenannt in Biologie der Algen und Protozoen)
Hinterlegungsdatum: 14 Mai 2018 12:13
Letzte Änderung: 02 Aug 2021 13:30
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