Svetlana Minakhina1, Jun Yang, Ruth Steward. 1. Waksman Institute, Department of Molecular Biology and Biochemistry, NJ Cancer Center, Rutgers University, 190 Frelinghuysen Road, Piscataway, NJ 08854-8020, USA.
Abstract
BACKGROUND: The NF-kappaB/Rel pathway functions in the establishment of dorsal-ventral polarity and in the innate humoral and cellular immune response in Drosophila. An important aspect of all NF-kappaB/Rel pathways is the translocation of the Rel proteins from the cytoplasm to the nucleus, where they function as transcription factors. RESULTS: We have identified a new protein, Tamo, which binds to Drosophila Rel protein Dorsal, but not to Dorsal lacking the nuclear localization sequence. Tamo does not bind to the other Drosophila Rel proteins, Dif and Relish. The Tamo-Dorsal complex forms in the cytoplasm and Tamo also interacts with a cytoplasmically orientated nucleoporin. In addition Tamo binds the Ras family small GTPase, Ran. Tamo functions during oogenesis and, based on phenotypic analysis, controls the levels of nuclear Dorsal in early embryos. It further regulates the accumulation of Dorsal in the nucleus after immune challenge. CONCLUSIONS: Tamo has an essential function during oogenesis. Tamo interacts with Dorsal and proteins that are part of the nuclear import machinery. We propose that tamo modulates the levels of import of Dorsal and other proteins.
BACKGROUND: The NF-kappaB/Rel pathway functions in the establishment of dorsal-ventral polarity and in the innate humoral and cellular immune response in Drosophila. An important aspect of all NF-kappaB/Rel pathways is the translocation of the Rel proteins from the cytoplasm to the nucleus, where they function as transcription factors. RESULTS: We have identified a new protein, Tamo, which binds to Drosophila Rel protein Dorsal, but not to Dorsal lacking the nuclear localization sequence. Tamo does not bind to the other Drosophila Rel proteins, Dif and Relish. The Tamo-Dorsal complex forms in the cytoplasm and Tamo also interacts with a cytoplasmically orientated nucleoporin. In addition Tamo binds the Ras family small GTPase, Ran. Tamo functions during oogenesis and, based on phenotypic analysis, controls the levels of nuclear Dorsal in early embryos. It further regulates the accumulation of Dorsal in the nucleus after immune challenge. CONCLUSIONS:Tamo has an essential function during oogenesis. Tamo interacts with Dorsal and proteins that are part of the nuclear import machinery. We propose that tamo modulates the levels of import of Dorsal and other proteins.
Authors: Rebekah L Horn; Thiruvarangan Ramaraj; Nicholas P Devitt; Faye D Schilkey; David E Cowley Journal: Mol Ecol Resour Date: 2016-07-12 Impact factor: 7.090
Authors: Ashley E Nazario-Toole; Javier Robalino; Kwame Okrah; Hector Corrada-Bravo; Stephen M Mount; Louisa P Wu Journal: J Immunol Date: 2018-07-11 Impact factor: 5.422
Authors: Anton J Enright; Bino John; Ulrike Gaul; Thomas Tuschl; Chris Sander; Debora S Marks Journal: Genome Biol Date: 2003-12-12 Impact factor: 13.583