Fibrillarin (FBL) antibody

Antigen: Fibrillarin (FBL)

Synonyms: zgc:56145, zgc:77130, wu:fb37g12, MGC116371, FBL, FIB, FLRN, RNU3IP1, AL022665, CG9888, DmelCG9888, Fibri, GCR-6, GCR6, pen59C5, Pen59C5, MGC76139

Clonality: Monoclonal (38F3)

Host: Mouse

Reactivity: Human, Rat (Rattus), Plant, Fruit Fly (Drosophila melanogaster), Caenorhabditis elegans (C. elegans), Schizosaccharomyces pombe (S. pombe)

Application: Western Blotting (WB), Immunofluorescence (IF)

Catalog no.: ABIN361375

Additional Information

Alternative name: Fibrillarin (Nop1p)

Isotype: IgG1  (Matching secondary antibodies)

Clone: 38F3

Description: Nop1p was originally identified as a nucleolar protein of bakers yeast, Saccharomyces cerevisiae. 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 (2). 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. 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).

Specificity: Specific for the ~34kDa Fibrillarin /Nop1p protein. It is expected that it will work on other mammal tissues.

Application Details

Application Notes: Recommended Dilution: WB: 1:1,000 IF: 1:500 Quality Control: Western blots performed on each lot.

Purification: Total IgG fraction

Storage: Store at -20 °C, stable for 1 year

Restrictions: For Research Use only

Images

Western blot of HeLa lysate showing specific immunolabeling of the ~ 34k fibrillarin protein.

Human SH-SY5Y cells stained with mouse-anti-fibrillarin, showing prominent specular nucleolar staining. The nuclei are counter stained with blue DAPI DNA stain, so these spots appear very pale blue.