Recombinant Human Exosome complex component CSL4 (EXOSC1)

Uniprot Id

Q9Y3B2

Target Species

Human

Target Name

EXOSC1

Target Full Name

Exosome complex component CSL4

Target Function

Non-catalytic component of the RNA exosome complex which has 3'->5' exoribonuclease activity and participates in a multitude of cellular RNA processing and degradation events. In the nucleus, the RNA exosome complex is involved in proper maturation of stable RNA species such as rRNA, snRNA and snoRNA, in the elimination of RNA processing by-products and non-coding 'pervasive' transcripts, such as antisense RNA species and promoter-upstream transcripts (PROMPTs), and of mRNAs with processing defects, thereby limiting or excluding their export to the cytoplasm. The RNA exosome may be involved in Ig class switch recombination (CSR) and/or Ig variable region somatic hypermutation (SHM) by targeting AICDA deamination activity to transcribed dsDNA substrates. In the cytoplasm, the RNA exosome complex is involved in general mRNA turnover and specifically degrades inherently unstable mRNAs containing AU-rich elements (AREs) within their 3' untranslated regions, and in RNA surveillance pathways, preventing translation of aberrant mRNAs. It seems to be involved in degradation of histone mRNA. The catalytic inactive RNA exosome core complex of 9 subunits (Exo-9) is proposed to play a pivotal role in the binding and presentation of RNA for ribonucleolysis, and to serve as a scaffold for the association with catalytic subunits and accessory proteins or complexes. EXOSC1 as peripheral part of the Exo-9 complex stabilizes the hexameric ring of RNase PH-domain subunits through contacts with EXOSC6 and EXOSC8.

Target Subcellular Location

Nucleus, nucleolus. Nucleus. Cytoplasm.

Target Protein Families

CSL4 family

Target Synonyms

3'-5' exoribonuclease CSL4 homolog; CGI 108; CGI-108; CSL4; CSL4 exosomal core protein homolog; CSL4, S. cerevisiae, homolog of; Csl4p; EXOS1_HUMAN; Exosc1; Exosomal core protein CSL4; Exosome complex component csl4; Exosome component 1; hCsl4p; Homolog of yeast exosomal core protein CSL4; p13; RP11-452K12.9; SKI4; Ski4p

Target Background

This gene encodes a core component of the exosome. The mammalian exosome is required for rapid degradation of AU rich element-containing RNAs but not for poly(A) shortening. The association of this protein with the exosome is mediated by protein-protein interactions with ribosomal RNA-processing protein 42 and ribosomal RNA-processing protein 46. Alternative splicing of this gene results in multiple transcript variants.