Partner of Y14 and mago; Regulator of the exon junction complex (EJC), a multiprotein complex that associates immediately upstream of the exon-exon junction on mRNAs and serves as a positional landmark for the intron exon structure of genes and directs post-transcriptional processes in the cytoplasm such as mRNA export, nonsense-mediated mRNA decay (NMD) or translation. Acts as an EJC disassembly factor by disrupting mature EJC from spliced mRNAs. Required for normal localization of osk mRNA to the posterior pole of the developing oocyte. Does not interact with the small ribosomal unit [...]

Eukaryotic initiation factor 4A-III; ATP-dependent RNA helicase. Core component of the splicing-dependent multiprotein exon junction complex (EJC) deposited at splice junctions on mRNAs. Involved in exon definition of genes containing long introns, including the rolled/MAPK gene. Has a role in oskar mRNA localization at the posterior pole of the developing oocyte.

Barentsz, isoform D; Barentsz (btz) encodes a component of the exon junction complex that is recruited to spliced mRNAs to mark where introns have been removed. It is required for the posterior localization of osk mRNA.

RNA-binding protein S1 (RnpS1) encodes a protein involved in RNA splicing and regulation of DNA transposition.

RE04053p; Upf2 (Upf2) encodes a protein required for nonsense-mediated mRNA decay (NMD). It interacts directly with the product of Upf1 to identify and degrade NMD-substrate mRNAs, including mRNAs containing premature termination codons and a number of normal endogenous mRNAs.

Upf3, isoform B; Upf3 (Upf3) encodes a protein that regulates targets of the nonsense-mediated mRNA decay pathway. This pathway participates in homeostatic gene expression regulation and plays a quality control role in the elimination of mRNAs with premature termination codons. The product of Upf3 is involved in cell cycle progression and general developmental rate.

Nuclear cap-binding protein subunit 2; Component of the cap-binding complex (CBC), which binds co- transcriptionally to the 5' cap of pre-mRNAs and is involved in various processes such as pre-mRNA splicing and RNA-mediated gene silencing (RNAi). The CBC complex is involved in miRNA-mediated RNA interference via its interaction with Ars2 and is required for primary microRNAs (miRNAs) processing. Also involved in innate immunity via the short interfering RNAs (siRNAs) processing machinery by restricting the viral RNA production. In the CBC complex, Cbp20 recognizes and binds capped RNAs [...]

ATP-dependent RNA helicase WM6; Required for mRNA export out of the nucleus. Probable RNA helicase that may regulate entry into mitosis by down-regulating the expression of other genes whose activity may be rate-limiting for entry into mitosis during embryogenesis. Binds to salivary gland chromosomes and modifies position effect variegation. Promotes an open chromatin structure that favors transcription during development by regulating the spread of heterochromatin.

Splicing factor 2 (SF2) encodes a protein involved in alternative mRNA splicing, RNA export from the nucleus and the regulation of the RNA metabolism.