InnateDB: Systems Biology of the Innate Immune Response

Mus musculus Protein: Rbm8a

Summary

InnateDB Protein

IDBP-175841.6

Last Modified

2014-10-13 [Report errors or provide feedback]

Gene Symbol

Rbm8a

Protein Name

RNA binding motif protein 8a

Synonyms

2310057C03Rik; AA673428; Rbm8;

Species

Mus musculus

Ensembl Protein

ENSMUSP00000044548

InnateDB Gene

IDBG-175839 (Rbm8a)

Protein Structure

UniProt Annotation

Function

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 WIBG/PYM 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; the function is different from the established EJC assembly (By similarity). {ECO:0000250}.

Subcellular Localization

Nucleus {ECO:0000250}. Nucleus speckle {ECO:0000250}. Cytoplasm {ECO:0000250}. Note=Nucleocytoplasmic shuttling protein. Travels to the cytoplasm as part of the exon junction complex (EJC) bound to mRNA. Colocalizes with the core EJC, ALYREF/THOC4, NXF1 and UAP56 in the nucleus and nuclear speckles (By similarity). {ECO:0000250}.

Disease Associations

Tissue Specificity

Comments

Interactions

Number of Interactions

This gene and/or its encoded proteins are associated with 2 experimentally validated interaction(s) in this database.
They are also associated with 69 interaction(s) predicted by orthology.

Experimentally validated
Total	2 [view]
Protein-Protein	2 [view]
Protein-DNA	0
Protein-RNA	0
DNA-DNA	0
RNA-RNA	0
DNA-RNA	0

Predicted by orthology
Total	69 [view]

Gene Ontology

Molecular Function

Accession	GO Term
GO:0000166	nucleotide binding
GO:0003676	nucleic acid binding
GO:0003723	RNA binding

Biological Process

GO:0000184	nuclear-transcribed mRNA catabolic process, nonsense-mediated decay
GO:0000381	regulation of alternative mRNA splicing, via spliceosome
GO:0006397	mRNA processing
GO:0006417	regulation of translation
GO:0008380	RNA splicing
GO:0051028	mRNA transport