Survival motor neuron protein - Q9VV74 (SMN_DROME)


Protein Feature View of PDB entries mapped to a UniProtKB sequence  

  • Number of PDB entries for Q9VV74: 1
The SMN complex plays an essential role in spliceosomal snRNP assembly in the cytoplasm, is required for pre-mRNA splicing in the nucleus and acts as a chaperone that discriminates target and non-target RNAs of Sm proteins. Required for normal expression of spliceosomal snRNAs and for U12 intron splicing. Required in cholinergic neurons, but not in motor neurons, to ensure correct splicing and proper levels of stas mRNA and normal neurotransmitter release by motor neurons (PubMed:23063130 and PubMed:23063131). However, Smn is required in motor neurons, but not in cholinergic neurons, for normal motor behavior but plays no role in synaptic transmission according to PubMed:23103409. In both muscle and neurons, required for the formation of a normal neuromuscular junction (NMJ) structure. Plays a neuron-specific role in long-term homeostatic compensation at the larval NMJ. In the thorax of adult flies, required for Act88F, an indirect flight muscle (IFM)-specific actin, expression and for proper IFM myofibril formation. In nurse cells, oocytes and follicle cells, required to maintain normal organization of nuclear compartments including chromosomes, nucleoli, Cajal bodies, histone locus bodies and heterochromatin. Required for the functional integrity of the cytoplasmic U snRNP body (U body) and P body. Required in dividing postembryonic neuroblasts (pNBs) for the correct basal localization of mira. The tight regulation of its expression is critical for stem cell division, proliferation and differentiation in male germline and developing central nervous system (CNS). Required for tracheal terminal cell lumen formation. UniProt
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Subunit Structure
Homodimer (via C-terminal region) (PubMed:11113446, PubMed:12783845, PubMed:22813737). Part of the core SMN complex, which seems to be composed of Smn and Gem2 only (PubMed:18621711, PubMed:23333303). The SMN complex associates with the entire set of spliceosomal snRNP Sm proteins, SmB, SmD1, SmD2, SmD3, SmE, SmF and SmG, and with the snRNP-specific proteins snRNP-U1-70K, U2A, snf/U1A and U5-116KD (PubMed:18621711, PubMed:23333303). Associates weakly with Gem3 (PubMed:18621711). Interacts with SmB and SmD1; the interaction is favored by methylation of the Sm proteins (PubMed:16753561, PubMed:18369183). Interacts with Actn; the interaction occurs in thoracic tissues and in adult flies (PubMed:17353360). Interacts with Rpp20 (PubMed:14715275). Interacts with msk and Snup; these interactions are RNA-dependent (PubMed:23885126). UniProt
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