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Abstract:

Lipid-protein interactions play an essential role in the regulation of biological function of integral membrane proteins; however, the underlying molecular mechanisms are not fully understood. Here we explore the modulation by phospholipids of the enzymatic activity of the plasma membrane calcium pump reconstituted in detergent-phospholipid mixed micelles of variable composition. The presence of increasing quantities of phospholipids in the micelles produced a cooperative increase in the ATPase activity of the enzyme. This activation effect was reversible and depended on the phospholipid/detergent ratio and not on the total lipid concentration. Enzyme activation was accompanied by a small structural change at the transmembrane domain reported by 1-aniline-8-naphtalenesulfonate fluorescence. In addition, the composition of the amphipilic environment sensed by the protein was evaluated by measuring the relative affinity of the assayed phospholipid for the transmembrane surface of the protein. The obtained results allow us to postulate a two-stage mechanistic model explaining the modulation of protein activity based on the exchange among non-structural amphiphiles at the hydrophobic transmembrane surface, and a lipid-induced conformational change. The model allowed to obtain a cooperativity coefficient reporting on the efficiency of the transduction step between lipid adsorption and catalytic site activation. This model can be easily applied to other phospholipid/detergent mixtures as well to other membrane proteins. The systematic quantitative evaluation of these systems could contribute to gain insight into the structure-activity relationships between proteins and lipids in biological membranes. © 2012 Dodes Traian et al.

Registro:

Documento: Artículo
Título:A two-stage model for lipid modulation of the activity of integral membrane proteins
Autor:Dodes Traian, M.M.; Cattoni, D.I.; Levi, V.; González Flecha, F.L.
Filiación:Laboratorio de Biofísica Molecular, Instituto de Química y Fisicoquímica Biológicas, Universidad de Buenos Aires - CONICET, Buenos Aires, Argentina
Laboratorio de Dinámica Intracelular- Departamento de Química Biológica, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires, Argentina
Centre de Biochimie Structurale, INSERM U554, CNRS UMR 5048, Université de Montpellier 1 and 2, Montpellier, France
Palabras clave:8 anilino 1 naphthalenesulfonic acid; adenosine triphosphatase (calcium); amphophile; membrane protein; phospholipid; adsorption kinetics; article; binding affinity; conformational transition; controlled study; enzyme activation; enzyme active site; enzyme activity; enzyme structure; fluorescence spectroscopy; human; human cell; hydrophobicity; micelle; molecular mechanics; molecular model; protein domain; protein lipid interaction; signal transduction; Algorithms; Enzyme Activation; Humans; Membrane Proteins; Micelles; Models, Molecular; Phospholipids; Plasma Membrane Calcium-Transporting ATPases
Año:2012
Volumen:7
Número:6
DOI: http://dx.doi.org/10.1371/journal.pone.0039255
Handle:http://hdl.handle.net/20.500.12110/paper_19326203_v7_n6_p_DodesTraian
Título revista:PLoS ONE
Título revista abreviado:PLoS ONE
ISSN:19326203
CAS:8 anilino 1 naphthalenesulfonic acid, 82-76-8; Membrane Proteins; Micelles; Phospholipids; Plasma Membrane Calcium-Transporting ATPases, 3.6.3.8
PDF:https://bibliotecadigital.exactas.uba.ar/download/paper/paper_19326203_v7_n6_p_DodesTraian.pdf
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_19326203_v7_n6_p_DodesTraian

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Citas:

---------- APA ----------
Dodes Traian, M.M., Cattoni, D.I., Levi, V. & González Flecha, F.L. (2012) . A two-stage model for lipid modulation of the activity of integral membrane proteins. PLoS ONE, 7(6).
http://dx.doi.org/10.1371/journal.pone.0039255
---------- CHICAGO ----------
Dodes Traian, M.M., Cattoni, D.I., Levi, V., González Flecha, F.L. "A two-stage model for lipid modulation of the activity of integral membrane proteins" . PLoS ONE 7, no. 6 (2012).
http://dx.doi.org/10.1371/journal.pone.0039255
---------- MLA ----------
Dodes Traian, M.M., Cattoni, D.I., Levi, V., González Flecha, F.L. "A two-stage model for lipid modulation of the activity of integral membrane proteins" . PLoS ONE, vol. 7, no. 6, 2012.
http://dx.doi.org/10.1371/journal.pone.0039255
---------- VANCOUVER ----------
Dodes Traian, M.M., Cattoni, D.I., Levi, V., González Flecha, F.L. A two-stage model for lipid modulation of the activity of integral membrane proteins. PLoS ONE. 2012;7(6).
http://dx.doi.org/10.1371/journal.pone.0039255