Welcome! Click here to login or here to register.
Catalytic RNA molecules
Enzymatic complexes
Draw a picture

Bujnicki Lab Homepage

Exosome complex exonuclease RRP45

Known also as: PM/Scl 1, Exosome component 9

Known abbreviations: hRrp45


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. EXOSC9 binds to ARE-containing RNAs.


Component of the RNA exosome complex. Specifically part of the catalytically inactive RNA exosome core (Exo-9) complex which is believed to associate with catalytic subunits EXOSC10, and DIS3 or DIS3L in cytoplasmic- and nuclear-specific RNA exosome complex forms. Exo-9 is formed by a hexameric ring of RNase PH domain-containing subunits specifically containing the heterodimers EXOSC4-EXOSC9, EXOSC5-EXOSC8 and EXOSC6-EXOSC7, and peripheral S1 domain-containing components EXOSC1, EXOSC2 and EXOSC3 located on the top of the ring structure.


Cytoplasm. Nucleus › nucleolus.

This protein can be a part of a given complexes:
NCBI GI number(s): 77812672
Species: Homo sapiens

Links to other databases:

Database ID Link
Uniprot Q06265 Q06265
KEGG 5393 5393
PFAM: - Q06265 (Link - using uniprot id)
InterPro: - Q06265 (Link - using uniprot id)
CATH: - -
SCOP: - -
Solved crystal structures: 2NN6
[PDB] [details]

Protein sequence:

Exosome complex exonuclease RRP45 (Homo sapiens) is product of expression of EXOSC9 gene.

Exosome complex exonuclease RRP45 (Homo sapiens) belongs to following protein families:

Title Authors Journal Publication date (Issue) PubMed ID
The association of the human PM/Scl-75 autoantigen with the exosome is dependent on a newly identified N terminus. Raijmakers R, Egberts WV, van Venrooij WJ, Pruijn GJ J Biol Chem 2003-08-15 (278) 12788944
Sequence-specific RNA binding mediated by the RNase PH domain of components of the exosome. Anderson JR, Mukherjee D, Muthukumaraswamy K, Moraes KC, Wilusz CJ, Wilusz J RNA 2006-10-01 (12) 16912217
Reconstitution, activities, and structure of the eukaryotic RNA exosome. Liu Q, Greimann JC, Lima CD Cell 2006-12-15 (127) 17174896
Adenylation and exosome-mediated degradation of cotranscriptionally cleaved pre-messenger RNA in human cells. West S, Gromak N, Norbury CJ, Proudfoot NJ Mol Cell 2006-01-03 (21) 16455498
The yeast exosome and human PM-Scl are related complexes of 3' --> 5' exonucleases. Allmang C, Petfalski E, Podtelejnikov A, Mann M, Tollervey D, Mitchell P Genes Dev 1999-08-15 (13) 10465791
Human cell growth requires a functional cytoplasmic exosome, which is involved in various mRNA decay pathways. van Dijk EL, Schilders G, Pruijn GJ RNA 2007-07-01 (13) 17545563
Generation and annotation of the DNA sequences of human chromosomes 2 and 4. Hillier LW, Graves TA, Fulton RS, Fulton LA, Pepin KH, Minx P, Wagner-McPherson C, Layman D, Wylie K, Sekhon M Nature 2005-04-07 (434) 15815621
Global, in vivo, and site-specific phosphorylation dynamics in signaling networks. Olsen JV, Blagoev B, Gnad F, Macek B, Kumar C, Mortensen P, Mann M Cell 2006-11-03 (127) 17081983
AU binding proteins recruit the exosome to degrade ARE-containing mRNAs. Chen CY, Gherzi R, Ong SE, Chan EL, Raijmakers R, Pruijn GJ, Stoecklin G, Moroni C, Mann M, Karin M Cell 2001-11-16 (107) 11719186
The mammalian exosome mediates the efficient degradation of mRNAs that contain AU-rich elements. Mukherjee D, Gao M, O'Connor JP, Raijmakers R, Pruijn G, Lutz CS, Wilusz J EMBO J 2002-02-15 (21) 11782436
Lys-N and trypsin cover complementary parts of the phosphoproteome in a refined SCX-based approach. Gauci S, Helbig AO, Slijper M, Krijgsveld J, Heck AJ, Mohammed S Anal Chem 2009-06-01 (81) 19413330
Initial characterization of the human central proteome. Burkard TR, Planyavsky M, Kaupe I, Breitwieser FP, Burckstummer T, Bennett KL, Superti-Furga G, Colinge J BMC Syst Biol 2011-01-01 (5) 21269460
Lysine acetylation targets protein complexes and co-regulates major cellular functions. Choudhary C, Kumar C, Gnad F, Nielsen ML, Rehman M, Walther TC, Olsen JV, Mann M Science 2009-08-14 (325) 19608861
A quantitative atlas of mitotic phosphorylation. Dephoure N, Zhou C, Villen J, Beausoleil SA, Bakalarski CE, Elledge SJ, Gygi SP Proc Natl Acad Sci U S A 2008-08-05 (105) 18669648
Quantitative phosphoproteomic analysis of T cell receptor signaling reveals system-wide modulation of protein-protein interactions. Mayya V, Lundgren DH, Hwang SI, Rezaul K, Wu L, Eng JK, Rodionov V, Han DK Sci Signal 2009-01-01 (2) 19690332
Evaluation of the low-specificity protease elastase for large-scale phosphoproteome analysis. Wang B, Malik R, Nigg EA, Korner R Anal Chem 2008-12-15 (80) 19007248
Dis3-like 1: a novel exoribonuclease associated with the human exosome. Staals RH, Bronkhorst AW, Schilders G, Slomovic S, Schuster G, Heck AJ, Raijmakers R, Pruijn GJ EMBO J 2010-07-21 (29) 20531389
Molecular characterization of an autoantigen of PM-Scl in the polymyositis/scleroderma overlap syndrome: a unique and complete human cDNA encoding an apparent 75-kD acidic protein of the nucleolar complex. Alderuccio F, Chan EK, Tan EM J Exp Med 1991-04-01 (173) 2007859

Add your own comment!

There are no comments yet.

Last modification of this entry: Sept. 25, 2012.

Welcome stranger! Click here to login or here to register.