The long-term objective of our research is to understand the mechanism of translation initiation in eukaryotes, its control under physiological conditions, and deregulation in diseases, such as cancer, diabetes and virus infection. Here, we propose to pursue our studies on the mechanism of function of the mRNA poly(A) binding protein (PABP) in translation initiation, and its regulation by members of a family of proteins known as PABP- interacting proteins (Paips), which were discovered in our laboratory. We demonstrated that Paip1 stimulates translation, whereas Paip2A and Paip2B inhibit translation. We propose three specific aims, which are as follows: 1. Investigate the function of a newly discovered complex, eIF3-Paip1. The molecular mechanism by which Paip1 stimulates translation will be studied, including a detailed structural characterization of the Paip1- eIF3 interaction. 2. Characterize the signaling pathways that regulate eIF3-Paip1 complex formation. We will determine whether phosphorylation of eIF3 regulates Paip1 binding and activity. Mutational analyses will be performed to study downstream effects of eIF3 phosphorylation on Paip1 function in translation. 3. Elucidate the physiological roles of Paip2A and Paip2B in animal models. Single knockout (KO) of Paip2A and Paip2B mice have recently been generated in our lab. Based on the known tissue distribution of the Paip2 proteins, we also intend to generate brain- and pancreas-specific KO mice. Mice will be subjected to complete phenotypic, pathological and histological examinations, and will be studied for effects on beta-cell regulation in the pancreas and on synaptic plasticity and memory formation in the brain.

Public Health Relevance

Many major diseases including cancer, diabetes and obesity arise because of defects in the control of the synthesis of proteins. We are studying an important example of such control, which involves a protein called poly(A) binding protein and its binding partners. Poly(A) binding protein binds to the tail of the genetic material (messenger RNA) that serves as template for the synthesis of all proteins in the cell. ? ? ?

Agency
National Institute of Health (NIH)
Institute
National Institute of General Medical Sciences (NIGMS)
Type
Research Project (R01)
Project #
2R01GM066157-05A2
Application #
7525828
Study Section
Molecular Genetics C Study Section (MGC)
Program Officer
Bender, Michael T
Project Start
2002-09-01
Project End
2012-06-30
Budget Start
2008-07-01
Budget End
2009-06-30
Support Year
5
Fiscal Year
2008
Total Cost
$210,600
Indirect Cost
Name
Mcgill University
Department
Type
DUNS #
205667090
City
Montreal
State
PQ
Country
Canada
Zip Code
H3 0-G4
Cao, Ruifeng; Gkogkas, Christos G; de Zavalia, Nuria et al. (2015) Light-regulated translational control of circadian behavior by eIF4E phosphorylation. Nat Neurosci 18:855-62
Cao, Ruifeng; Robinson, Barry; Xu, Haiyan et al. (2013) Translational control of entrainment and synchrony of the suprachiasmatic circadian clock by mTOR/4E-BP1 signaling. Neuron 79:712-24
Khoutorsky, Arkady; Yanagiya, Akiko; Gkogkas, Christos G et al. (2013) Control of synaptic plasticity and memory via suppression of poly(A)-binding protein. Neuron 78:298-311
Svitkin, Yuri V; Yanagiya, Akiko; Karetnikov, Alexey E et al. (2013) Control of translation and miRNA-dependent repression by a novel poly(A) binding protein, hnRNP-Q. PLoS Biol 11:e1001564
Rosenfeld, Amy B (2011) Suppression of cellular transformation by poly (A) binding protein interacting protein 2 (Paip2). PLoS One 6:e25116
Alvarez-Saavedra, Matías; Antoun, Ghadi; Yanagiya, Akiko et al. (2011) miRNA-132 orchestrates chromatin remodeling and translational control of the circadian clock. Hum Mol Genet 20:731-51
Bidinosti, Michael; Ran, Israeli; Sanchez-Carbente, Maria R et al. (2010) Postnatal deamidation of 4E-BP2 in brain enhances its association with raptor and alters kinetics of excitatory synaptic transmission. Mol Cell 37:797-808
Yanagiya, Akiko; Delbes, Geraldine; Svitkin, Yuri V et al. (2010) The poly(A)-binding protein partner Paip2a controls translation during late spermiogenesis in mice. J Clin Invest 120:3389-400
Svitkin, Yuri V; Evdokimova, Valentina M; Brasey, Ann et al. (2009) General RNA-binding proteins have a function in poly(A)-binding protein-dependent translation. EMBO J 28:58-68
Kanaan, Ahmad Seif; Frank, Filipp; Maedler-Kron, Chelsea et al. (2009) Crystallization and preliminary X-ray diffraction analysis of the middle domain of Paip1. Acta Crystallogr Sect F Struct Biol Cryst Commun 65:1060-4

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