INVESTIGADORES
VACCARO Maria Ines
artículos
Título:
VMP1 is a new player in the regulation of the autophagy-specific phosphatidylinositol 3-kinase complex activation.
Autor/es:
MOLEJÓN MI; ROPOLO A; BOGGIO V; VACCARO MI
Revista:
AUTOPHAGY
Editorial:
LANDES BIOSCIENCE
Referencias:
Lugar: Austin, Texas; Año: 2013 vol. 9 p. 933 - 935
ISSN:
1554-8627
Resumen:
Autophagy. 2013 Jun 1;9(6):933-5. doi: 10.4161/auto.24390. Epub 2013 Apr 4.
VMP1 is a new player in the regulation of the autophagy-specific phosphatidylinositol 3-kinase complex activation.
Molejon MI, Ropolo A, Vaccaro MI.
Source
Institute
for Biochemistry and Molecular Medicine; Consejo Nacional de
Investigaciones Científicas y Técnicas (CONICET); Department of
Pathophysiology; School of Pharmacy and Biochemistry; University of
Buenos Aires; Buenos Aires, Argentina.
Abstract
We
have elucidated a novel mechanism through which the autophagy-specific
class III phosphatidylinositol 3-kinase (PtdIns3K) complex can be
recruited to the PAS in mammalian cells, through the interaction between
BECN1 and the vacuole membrane protein 1 (VMP1), an integral
autophagosomal membrane protein. This interaction involves the binding
between the C-terminal 20 amino acids of the VMP1 hydrophilic domain,
which we have named the VMP1 autophagy-related domain (VMP1-AtgD), and
the BH3 domain of BECN1. The association between these two proteins
allows the formation of the autophagy-specific PtdIns3K complex, which
activity favors the generation of phosphatidylinositol-3-phosphate
(PtdIns3P) and the subsequent association of the autophagy-related (ATG)
proteins, including ATG16L1, with the phagophore membranes. Therefore,
VMP1 regulates the PtdIns3K activity on the phagophore membrane through
its interaction with BECN1. Our data provide a novel model describing
one of the key steps in phagophore assembly site (PAS) formation and
autophagy regulation, and positions VMP1 as a new interactor of the
autophagy-specific PtdIns3K complex in mammalian cells.