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RESEARCH PRODUCT

Post-translational modifications in the survival motor neuron protein

Sacha KallenbachVincenzo La BellaBrigitte Pettmann

subject

INVOLVEMENTFORMSPRODUCTBiochemistryMiceChlorocebus aethiopsProtein IsoformsPhosphorylationCyclic AMP Response Element-Binding ProteinSMN PROTEINCells CulturedMotor NeuronsSPINAL MUSCULAR-ATROPHYRNA-Binding ProteinsSMN Complex Proteins3T3 CellsTransfectionmedicine.anatomical_structureSpinal CordCOS CellsSUBCELLULAR-LOCALIZATIONEXPRESSIONGene isoformRecombinant Fusion ProteinsBiophysicsNerve Tissue ProteinsBiologyMuscular Atrophy SpinalGene productSMN Complex ProteinsComplementary DNAmedicineAnimalsHumansMolecular BiologyCell BiologySpinal muscular atrophyMotor neuronmedicine.diseaseSurvival of Motor Neuron 1 ProteinMolecular biologyRatsnervous system diseasesMolecular WeightSEVERITYnervous systemBODIESProtein Processing Post-TranslationalDETERMINING GENEImmunostaining

description

Spinal muscular atrophy (SMA) is an autosomal recessive disease characterized by a progressive loss of the spinal motoneurons. The SMA-determining gene has been termed survival motor neuron (SMN) and is deleted or mutated in over 98% of patients. The encoded gene product is a protein expressed as different isoforms. In particular, we showed that the rat SMN cDNA produces two isoforms with Mr of 32 and 35 kDa, both localized in nuclear coiled bodies, but the 32 kDa form is also cytoplasmic, whereas the 35 kDa form is also microsomal. To determine the molecular relationship between these two isoforms and potential post-translational modifications, we performed transfection experiments with a double-tagged rat SMN. Immunoblot and immunostaining studies demonstrated that the 32 kDa SMN isoform derives from the full length 35 kDa, through a proteolytic cleavage at the C-terminal. Furthermore, the 35 kDa SMN isoform is physiologically phosphorylated in vivo. This may modulate its interaction with molecular partners, either proteins or nucleic acids. (

yearjournalcountryeditionlanguage
2004-08-22Biochemical and Biophysical Research Communications
https://doi.org/10.1016/j.bbrc.2004.09.057