RNA-binding protein 8A - Q9Y5S9 (RBM8A_HUMAN)

 

Protein Feature View of PDB entries mapped to a UniProtKB sequence  

  • Number of PDB entries for Q9Y5S9: 10
 
Function
Required for pre-mRNA splicing as component of the spliceosome (PubMed:28502770, PubMed:29301961). Core component of the splicing-dependent multiprotein exon junction complex (EJC) deposited at splice junctions on mRNAs. The EJC is a dynamic structure consisting of core proteins and several peripheral nuclear and cytoplasmic associated factors that join the complex only transiently either during EJC assembly or during subsequent mRNA metabolism. The EJC marks the position of the exon-exon junction in the mature mRNA for the gene expression machinery and the core components remain bound to spliced mRNAs throughout all stages of mRNA metabolism thereby influencing downstream processes including nuclear mRNA export, subcellular mRNA localization, translation efficiency and nonsense-mediated mRNA decay (NMD). The MAGOH-RBM8A heterodimer inhibits the ATPase activity of EIF4A3, thereby trapping the ATP-bound EJC core onto spliced mRNA in a stable conformation. The MAGOH-RBM8A heterodimer interacts with the EJC key regulator PYM1 leading to EJC disassembly in the cytoplasm and translation enhancement of EJC-bearing spliced mRNAs by recruiting them to the ribosomal 48S preinitiation complex. Its removal from cytoplasmic mRNAs requires translation initiation from EJC-bearing spliced mRNAs. Associates preferentially with mRNAs produced by splicing. Does not interact with pre-mRNAs, introns, or mRNAs produced from intronless cDNAs. Associates with both nuclear mRNAs and newly exported cytoplasmic mRNAs. The MAGOH-RBM8A heterodimer is a component of the nonsense mediated decay (NMD) pathway. Involved in the splicing modulation of BCL2L1/Bcl-X (and probably other apoptotic genes); specifically inhibits formation of proapoptotic isoforms such as Bcl-X(S); the function is different from the established EJC assembly. UniProt
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Subunit Structure
Heterodimer with either MAGOH or MAGOHB (PubMed:10662555, PubMed:12730685, PubMed:23917022, PubMed:12781131). Part of the mRNA splicing-dependent exon junction complex (EJC) complex; the core complex contains CASC3, EIF4A3, MAGOH or MAGOHB, and RBM8A (PubMed:11707413, PubMed:16170325, PubMed:16314458, PubMed:23917022, PubMed:16923391, PubMed:16931718, PubMed:19033377, PubMed:20479275). Interacts with PYM1; the interaction is direct and dissociates the EJC from spliced mRNAs (PubMed:14968132, PubMed:18026120, PubMed:19410547). Part of a complex that contains the EJC core components CASC3, EIF4A3, MAGOH and RBM8A plus proteins involved in nonsense-mediated mRNA decay, such as UPF1, UPF2, UPF3A and UPF3B (PubMed:11546873, PubMed:12718880, PubMed:20479275). Found in a post-splicing complex with NXF1, MAGOH, UPF1, UPF2, UPF3A, UPF3B and RNPS1 (PubMed:11546874). Interacts with BAT1, MAGOH, DPH1, UPF3B, RNPS1, SRRM1 and ALYREF/THOC4 (PubMed:11013075, PubMed:11118221, PubMed:11707413, PubMed:12944400). Interacts with IPO13; the interaction mediates the nuclear import of the MAGOH-RBM8A heterodimer (PubMed:11447110). Identified in the spliceosome C complex (PubMed:11991638, PubMed:28502770, PubMed:29301961). Associates with polysomes (PubMed:12121612). UniProt
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Data in green originates from UniProtKB  
Variation data (sourced from UniProt) shows non-genetic variation from the ExPASy   and dbSNP   websites.
Data in yellow originates from Pfam  , by interacting with the HMMER3 web site  
Data in purple originates from Phosphosite  .
Data in orange originates from the SCOP   (version 1.75) and SCOPe   (version 2.04) classifications.
Data in grey has been calculated using BioJava  . Protein disorder predictions are based on JRONN (Troshin, P. and Barton, G. J. unpublished), a Java implementation of RONN  
  • Red: potentially disorderd region
  • Blue: probably ordered region.
Hydropathy has been calculated using a sliding window of 15 residues and summing up scores from standard hydrophobicity tables.
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  • Blue: hydrophilic.
Data in lilac represent the genomic exon structure projected onto the UniProt sequence.
Data in blue originates from PDB
  • Secstruc: Secondary structure projected from representative PDB entries onto the UniProt sequence.
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The PDB to UniProt mapping is based on the data provided by the EBI SIFTS project. See also Velankar et al., Nucleic Acids Research 33, D262-265 (2005).
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