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Gemin3: A novel DEAD box protein that interacts with SMN, the spinal muscular atrophy gene product, and is a component of gems.

The survival of motor neurons (SMN) gene is the disease gene of spinal muscular atrophy (SMA), a common motor neuron degenerative disease. The SMN protein is part of a complex containing several proteins, of which one, SIP1 (SMN interacting protein 1), has been characterized so far. The SMN complex is found in both the cytoplasm and in the nucleus, where it is concentrated in bodies called gems. In the cytoplasm, SMN and SIP1 interact with the Sm core proteins of spliceosomal small nuclear ribonucleoproteins (snRNPs), and they play a critical role in snRNP assembly. In the nucleus, SMN is required for pre-mRNA splicing, likely by serving in the regeneration of snRNPs. Here, we report the identification of another component of the SMN complex, a novel DEAD box putative RNA helicase, named Gemin3. Gemin3 interacts directly with SMN, as well as with SmB, SmD2, and SmD3. Immunolocalization studies using mAbs to Gemin3 show that it colocalizes with SMN in gems. Gemin3 binds SMN via its unique COOH-terminal domain, and SMN mutations found in some SMA patients strongly reduce this interaction. The presence of a DEAD box motif in Gemin3 suggests that it may provide the catalytic activity that plays a critical role in the function of the SMN complex on RNPs.

Pubmed ID: 10601333 RIS Download

Mesh terms: Amino Acid Motifs | Amino Acid Sequence | Antibodies, Monoclonal | Blotting, Western | Cloning, Molecular | Cyclic AMP Response Element-Binding Protein | Cytoplasm | DEAD Box Protein 20 | DEAD-box RNA Helicases | HeLa Cells | Humans | Molecular Sequence Data | Molecular Weight | Muscular Atrophy, Spinal | Nerve Tissue Proteins | Organelles | Precipitin Tests | Protein Binding | RNA Helicases | RNA-Binding Proteins | Recombinant Fusion Proteins | Ribonucleoproteins, Small Nuclear | SMN Complex Proteins | Sequence Alignment | Sequence Deletion | Spliceosomes

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European Molecular Biology Laboratory; Heidelberg; Germany

An international research organization that is one of the world''s top research institutions dedicated to basic research in the molecular life sciences. Outstanding training is available at multiple levels: predoctoral students, postdocs and visiting scientists are provided with exceptional training opportunities. The cornerstones of EMBL''s mission are: to perform basic research in molecular biology, to train scientists, students and visitors at all levels, to offer vital services to scientists in the member states, and to develop new instruments and methods in the life sciences, and technology transfer. Research at EMBL is conducted by approximately 85 independent groups covering the spectrum of molecular biology. The Laboratory has five units: the main Laboratory in Heidelberg, and outstations in Hinxton near Cambridge (the European Bioinformatics Institute), Grenoble, Hamburg, and Monterotondo near Rome. EMBL is international, innovative and interdisciplinary. Its 1,400 employees from 60 nations represent scientific disciplines including biology, physics, chemistry and computer science.

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