INVESTIGADORES
PODESTA Ernesto Jorge
congresos y reuniones científicas
Título:
HORMONE-DEPENDENT PHOSPHORYLATION OF ACYL-COA SYNTHETASE 4 (Acsl4) IN STEROIDOGENIC Cell
Autor/es:
CASTILLA R; SMITH E; CASTILLO AF; PODEROSO C; PODESTÁ EJ
Lugar:
Tucuman
Reunión:
Congreso; Sociedad Argentina de Investigaciones Bioquímicas y Biologia Molecular; 2009
Institución organizadora:
Sociedad Argentina de Investigaciones Bioquímicas y Biologia Molecular
Resumen:
Steroid synthesis is modulated by different hormones or factors
through PKA or PKC-mediated protein phosphorylation. Acsl4,
whose substrate is Arachidonic Acid (AA), is a key enzyme in
steroid synthesis. We previously described that Acsl4 and Acyl-
CoA thioesterase I (Acot2) regulate the intracellular levels of AA
and steroidogenesis in a concerted manner. Since Acsl4
aminoacidic sequence shows phosphorylation consensus sites for
PKA and PKC, the aim of this study was to determine whether
Acsl4 is substrate of these kinases. Recombinant Acsl4 results to be
suitable substrate for PKA and PKC kinase. Then, we studied Acsl4
phosphorylation in Y1 adrenal cells. By 32P[H PO ] incorporation, 3 4
immunoprecipitation, two-dimensional gel electrophoresis,
autorradigraphy and western-blot we demonstrated that ACTH
regulates the phosphorylation of Acsl4. We demonstrate for the first
time that Acsl4 is a phosphoprotein and that this phosphorylation is
hormone regulated.