The Nop1p protein is 327 amino acids in size (34.5kDa), is essential for yeast viability, and is localized in the nucleoli (1). The systematic name for S. cerevisiae Nop1 is YDL014W, and it is now known to be part of the small subunit processome complex, involved in the processing of pre-18S ribosomal RNA. Nop1p is the yeast homologue of a protein found in all eukaryotes and archea generally called fibrillarin. Fibrillarin/Nop1p is extraordinarily conserved, so that the yeast and human proteins are 67% identical, and the human protein can functionally replace the yeast protein.
This protein lacks the RGG rich N-terminal extension but is clearly homologues to the other sequences throughout all of the fibrillarin domain. The 3D structure of this molecule has been determined and shown to consist of 2 extended b-sheets flanked by 4 a-helixes. Patients with the autoimmune disease scleroderma often have strong circulating autoantibodies to a ~34kDa protein which was subsequently found to be fibrillarin. Recent studies show that knock out of the fibrillarin gene in mice results in embryonic lethality, although mice with only one functional fibrillarin/Nop1p gene were viable (3). This antibody is becoming widely used as a convenient marker for nucleoli in a wide variety of species (e.g. 4-6).
1. Ochs RL, Lischwe MA, Spohn WH, Busch H. Fibrillarin: a new protein of the nucleolus identified by autoimmune sera. Biol Cell 54:123-133 (1985).
2. Aris JP and Blobel G. Identification and characterization of a yeast nucleolar protein that is similar to a rat liver nucleolar protein. J. Cell Biol. 107:17-31 (1988).
3. Newton K, Petfalski E, Tollervey D, Caceres JF. Fibrillarin is essential for early development and required for accumulation of an intron-encoded small nucleolar RNA in the mouse. Mol Cell Biol. 23:8519-8527 (2003).
4. Tyagi S and Alsmadi O. Imaging native beta-actin mRNA in motile fibroblasts. Biophys J. 87:4153-62 (2004).
5. Paeschke1 K, Simonsson T, Postberg J, Rhodes D, Lipps H-J. Telomere end-binding proteins control the formation of G-quadruplex DNA structures in vivo Nature Structural & Molecular Biology 12, 847-854 (2005)
6. Vermaak D, Henikoff S, Malik HS. Positive selection drives the evolution of rhino, a member of the heterochromatin protein 1 family in Drosophila. PLoS Genetics 1:96-108 (2005).
- Product ReviewsI recommend this product Product Name: Fibrillarin/Nop1p- Nucleolar Marker – (Cat# MO22108) Organization: University of Wisconsin-MadisonChelcie Eller - Aug 08, 2013 - Rating: 5.0
Leave a review for this product and you could be eligible for a $10 Starbucks gift card.
- Product Publications
If you've used this product in a publication, let us know. Email email@example.com, with the publication details and you could be eligible for an Amazon gift card.
- Related Products
Name Catalog # Size ATPase Na+/K+ transporting alpha 1 MO25023 50 ul Fibrillarin MO22169 100 µl FluoGreen Tracer SF41000 100 ul GFP GT22101 100 ul Green Fluorescent Protein CH22124 100 ul of 1 mg/ml Green Fluorescent Protein MO22184 100 ul Green Fluorescent Protein (GFP) CH23105 400 ul Green Fluorescent Protein (GFP) MO22190 100 ul Green Fluorescent Protein (GFP) RA22134 100 ul of 1 mg/ml High-mobility group protein B1/HMGP1 MO22134 100 ul Lamin A/C MO22124 100 ul mCherry MO22192 100 ul mCherry - Mouse MO22140 100 ul mCherry-Chicken CH22115 100 ul mCherry-Rabbit RA22117 100 ul MiTF (Microphthalmia-Associated Transcription Factor) MO47034 0.5 ml Panspecific Nuclear Pore Complex Marker MO22107 500 ul TAF15 MO22114 100 ul Tar DNA Binding Protein 43 (TDP43) MO22117 100 ul