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A novel role for the Drosophila epsin (lqf): involvement in autophagy

Csikós, György and Lippai, Mónika and Lukacsovich, Tamás and Juhász, Gábor and Henn, László and Erdélyi, Miklós and Maróy, Péter and Sass, Miklós (2009) A novel role for the Drosophila epsin (lqf): involvement in autophagy. AUTOPHAGY, 5 (5). pp. 636-648. ISSN 1554-8627

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Abstract

Screening P-element-induced mutant collections, 52 lines were selected as potentially defected ones in endocytosis or autophagy. After excluding those which were rescued by 20-hydroxyecdysone treatment, the exact position of the inserted P-element was determined in the remaining lines. In the case of l(3)S011027 stock, the liquid facets (lqf) gene was affected which codes an epsin-homolog protein in Drosophila. We reveal that Lqf is essential to the receptor-mediated endocytosis of larval serum proteins (LSPs) in the larval fat body cells of Drosophila. In l(3)S011027 line, lack of Lqf fails the formation of autophagosomes thus leading to the arrest of destroying of trophocytes. Transgenic larvae carrying Lqf-RNAi construct were unable to generate endocytic and autophagic vacuoles and led to a prolonged larval stage. On the other hand, Lqf protein showed an exclusive colocalization with the Lyso Tracker Red- or GFP-Atg8a labeled autophagosomes. By using the antiserum generated against the fifth exon of lqf, we demonstrated that prior to the onset of developmental autophagy the Lqf protein was present in the nucleus of fat body cell, but thereafter the protein was localized in the territory of endocytic and autophagic vacuoles. The fact that the inhibition of the target of rapamycin (TOR) did not restore the autophagic process and the normal development in the case of lqf mutant larvae points to that the Lqf is downstream to the TOR, the central kinase of the autophagy pathway.

Item Type: Article
Uncontrolled Keywords: HEAT REPEATS; SELF-DIGESTION; PIERIS-BRASSICAE; MEDIATED ENDOCYTOSIS; DEUBIQUITINATING ENZYME; SACCHAROMYCES-CEREVISIAE; ENTH DOMAIN; MAMESTRA-BRASSICAE; FAT-BODY CELLS; PROGRAMMED CELL-DEATH; IMMUNOLOCALIZATION; RNAi; Autophagy; ENDOCYTOSIS; Liquid facets
Subjects: Q Science / természettudomány > QH Natural history / természetrajz > QH301 Biology / biológia > QH3011 Biochemistry / biokémia
Q Science / természettudomány > QH Natural history / természetrajz > QH301 Biology / biológia > QH3015 Molecular biology / molekuláris biológia
Q Science / természettudomány > QH Natural history / természetrajz > QH426 Genetics / genetika, örökléstan
SWORD Depositor: MTMT SWORD
Depositing User: MTMT SWORD
Date Deposited: 30 Jun 2014 08:37
Last Modified: 30 Jun 2014 08:39
URI: http://real.mtak.hu/id/eprint/13376

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