Artículo
Regulation of plasma membrane Ca 2 +-ATPase activity by acetylated tubulin: Influence of the lipid environment
Monesterolo, Noelia Edith
; Amaiden, Marina Rafaela
; Campetelli, Alexis Nazareno
; Santander, Verónica Silvina
; Arce, Carlos Angel
; Pié, Juan; Casale, Cesar Horacio
Fecha de publicación:
03/2012
Editorial:
Elsevier Science
Revista:
Biochimica et Biophysica Acta - Biomembranes
ISSN:
0005-2736
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
We demonstrated previously that acetylated tubulin inhibits plasma membrane Ca 2 +-ATPase (PMCA) activity in plasma membrane vesicles (PMVs) of rat brain through a reversible interaction. Dissociation of the PMCA/tubulin complex leads to restoration of ATPase activity. We now report that, when the enzyme is reconstituted in phosphatidylcholine vesicles containing acidic or neutral lipids, tubulin not only loses its inhibitory effect but is also capable of activating PMCA. This alteration of the PMCA-inhibitory effect of tubulin was dependent on concentrations of both lipids and tubulin. Tubulin (300 μg/ml) in combination with acidic lipids at concentrations > 10%, increased PMCA activity up to 27-fold. The neutral lipid diacylglycerol (DAG), in combination with 50 μg/ml tubulin, increased PMCA activity > 12-fold, whereas tubulin alone at high concentration (≥ 300 μg/ml) produced only 80% increase. When DAG was generated in situ by phospholipase C incubation of PMVs pre-treated with exogenous tubulin, the inhibitory effect of tubulin on PMCA activity (ATP hydrolysis, and Ca 2 + transport within vesicles) was reversed. These findings indicate that PMCA is activated independently of surrounding lipid composition at low tubulin concentrations (< 50 μg/ml), whereas PMCA is activated mainly by reconstitution in acidic lipids at high tubulin concentrations. Regulation of PMCA activity by tubulin is thus dependent on both membrane lipid composition and tubulin concentration.
Palabras clave:
LIPID COMPOSITION
,
PHOSPHOLIPASE C
,
PLASMA MEMBRANE CA 2 +-ATPASE
,
TUBULIN
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Articulos(CCT - CORDOBA)
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - CORDOBA
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - CORDOBA
Articulos(CIQUIBIC)
Articulos de CENTRO DE INVEST.EN QCA.BIOL.DE CORDOBA (P)
Articulos de CENTRO DE INVEST.EN QCA.BIOL.DE CORDOBA (P)
Citación
Monesterolo, Noelia Edith; Amaiden, Marina Rafaela; Campetelli, Alexis Nazareno; Santander, Verónica Silvina; Arce, Carlos Angel; et al.; Regulation of plasma membrane Ca 2 +-ATPase activity by acetylated tubulin: Influence of the lipid environment; Elsevier Science; Biochimica et Biophysica Acta - Biomembranes; 1818; 3; 3-2012; 601-608
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