SUMO-1 transiently localizes to Cajal bodies in mammalian neurons |
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Authors: | Navascues J Bengoechea R Tapia O Casafont I Berciano M T Lafarga M |
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Institution: | aDepartamento de Anatomia y Biologia Celular, Unidad de Biomedicina (C.S.I.C), Universidad de Cantabria, Santander, y Centro de Investigación Biomedica en Red sobre Enfermedades Neurodegenerativas (CIBERNED), Spain |
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Abstract: | Cajal bodies (CBs) are nuclear organelles involved in the maturation of small nuclear ribonucleoproteins required for the processing of pre-mRNAs. They concentrate coilin, splicing factors and the survival of motor neuron protein (SMN). By using immunocytochemistry and transfection experiments with GFP–SUMO-1, DsRed1-Ubc9, GFP–coilin and GFP–SMN constructs we demonstrate the presence of SUMO-1 and the SUMO conjugating enzyme (Ubc9) in a subset of CBs in undifferentiated neuron-like UR61 cells. Furthermore, SUMO-1 is transiently localized into neuronal CBs from adult nervous tissue in response to osmotic stress or inhibition of methyltransferase activity. SUMO-1-positive CBs contain coilin, SMN and small nuclear ribonucleoproteins, suggesting that they are functional CBs involved in pre-mRNA processing. Since coilin and SMN have several putative motifs of SUMO-1 modification, we suggest that the sumoylation of coilin and/or SMN might play a role in the molecular reorganization of CBs during the neuronal differentiation or stress–response. |
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Keywords: | Cajal bodies SUMO-1 conjugation Coilin SMN Neurons Osmotic stress Methyltransferase inhibitors |
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