Fat mass and obesity-associated (FTO) protein interacts with CaMKII and modulates the activity of CREB signaling pathway.
Polymorphisms in the fat mass and obesity-associated (FTO) gene have been associated with obesity in humans. FTO is a nuclear protein and its physiological function remains largely unknown, but alterations in its expression in mice influence energy expenditure, food intake and, ultimately, body weight. To understand the molecular functions of FTO, we performed a yeast two-hybrid screen to identify the protein(s) that could directly interact with human FTO protein. Using multiple assays, we demonstrate that FTO interacts with three isoforms of calcium/calmodulin-dependent protein kinase II: α, β and γ, which are protein kinases that phosphorylate a broad range of substrates. This interaction is functional; overexpression of FTO delays the dephosphorylation of cAMP response element-binding protein (CREB) in human neuroblastoma (SK-N-SH) cells, which in turn leads to a dramatic increase in the expression of the CREB targets neuropeptide receptor 1 (NPY1R) and brain-derived neurotrophic factor (BDNF), which already are known to regulate food intake and energy homeostasis. Thus, our results suggest that FTO could modulate obesity by regulating the activity of the CREB signaling pathway.
Department of Human Genetics and.
Li
L
Lin
Department of Neurology and Center for Neurodegenerative Diseases, Emory University School of Medicine, Atlanta, GA 30322, USA.
Chadwick M
CM
Hales
Department of Human Genetics and.
Kathryn
K
Garber
Department of Human Genetics and peng.jin@emory.edu.
Peng
P
Jin
D000071516:Alpha-Ketoglutarate-Dependent Dioxygenase FTO; D001835:Body Weight / Q000235:genetics*; D019208:Brain-Derived Neurotrophic Factor / Q000378:metabolism; D050882:CREB-Binding Protein / Q000378:metabolism*; D054732:Calcium-Calmodulin-Dependent Protein Kinase Type 2 / Q000378:metabolism*; D045744:Cell Line, Tumor; D005576:Colforsin / Q000494:pharmacology; D004435:Eating / Q000235:genetics; D004734:Energy Metabolism; D005786:Gene Expression Regulation; D057809:HEK293 Cells; D006706:Homeostasis; D006801:Humans; D010766:Phosphorylation; D011506:Proteins / Q000235:genetics* / Q000378:metabolism*; D017476:Receptors, Neuropeptide Y / Q000378:metabolism; D015398:Signal Transduction
D019208:Brain-Derived Neurotrophic Factor; D011506:Proteins; D017476:Receptors, Neuropeptide Y; C097212:neuropeptide Y-Y1 receptor; D005576:Colforsin; C579455:BDNF protein, human; D000071516:Alpha-Ketoglutarate-Dependent Dioxygenase FTO; C526492:FTO protein, human; D050882:CREB-Binding Protein; C494363:CREBBP protein, human; D054732:Calcium-Calmodulin-Dependent Protein Kinase Type 2