URM1 Rabbit Polyclonal Antibody

CAT#: R1200

URM1 rabbit polyclonal antibody, Purified

Product Images

Figure 1. Immunoblot of Urm1 fusion protein: Anti-Urm1 antibody generated by immunization with recombinant yeast Urm1 was tested by immunoblot against yeast lysates expressing the Urm1-GFP fusion protein and other UBL fusion proteins. All UBLs possess limited homology to Ubiquitin and to each other, therefore it is important to know the degree of reactivity of each antibody against each UBL. Panel A shows total protein staining using ponceau. Panel B shows positions of free GFP or GFP containing recombinant proteins present in each lysate preparation after reaction with a 1:1,000 dilution of anti-GFP followed by reaction with a 1:15,000 dilution of HRP Donkey-a-Goat IgG. Panel C shows specific reaction with Urm1 using a 1:1,000 dilution of IgG fraction of Rabbit-anti-Urm1 (Yeast) followed by reaction with a 1:15,000 dilution of HRP Goat-a-Rabbit IgG. All primary antibodies were diluted in TTBS buffer supplemented with 5% non-fat milk and incubated with the membranes overnight at 4°C. Yeast lysate proteins were separated by SDS-PAGE using a 15% gel. This data indicates that anti-Urm1 is highly specific and does not cross react with other UBLs. Bands present in Panel C indicate that Urm1 and conjugated Urm1 is present in most yeast cell lysates albeit at significantly reduced levels relative to the Urm1-GFP transfected lysate. A chemiluminescence system was used for signal detection (Roche). Other detection systems will yield similar results. Data contributed by M. Malakhov, www.lifesensors.com, personal communication.

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  Figure 2. Conjugation pathways for ubiquitin and ubiquitin-like modifiers (UBLs). Most modifiers mature by proteolytic processing from inactive precursors (a; amino acid). Arrowheads point to the cleavage sites. Ubiquitin is expressed either as polyubiquitin or as a fusion with ribosomal proteins. Conjugation requires activating (E1) and conjugating (E2) enzymes that form thiolesters (S) with the modifiers. Modification of cullins by RUB involves SCF (SKP1/cullin-1/F-box protein) /CBC (cullin-2/elongin B/elonginC) -like E3 enzymes that are also involved in ubiquitination. In contrast to ubiquitin, the UBLs do not seem to form multi-UBL chains. UCRP (ISG15) resembles two ubiquitin moieties linked head-to-tail. Whether HUB1 functions as a modifier is currently unclear. APG12 and URM1 are distinct from the other modifiers because they are unrelated in sequence to ubiquitin. Data contributed by S.Jentsch, see reference 5.

Specifications

Product Data

• Applications: Assay, ELISA, WB
• Recommended Dilution: Suitable for ELISA (1/2,000-1/10,000) and Immunoblotting (1/1,000). Although not tested, this antibody is likely functional in Immunohistochemistry and Immunoprecipitation.
  This antibody using the specified conditions may recognize other prominent intrinsic bands (UBLs or their conjugates).
  Other intrinsic bands are readily detectable in yeast lysates at lower antibody dilutions.
  A 12 kDa band corresponding to yeast Urm1 is detected. Most yeast cell lysates can be used as a positive control without induction or stimulation.
• Reactivities: Yeast
• Host: Rabbit
• Clonality: Polyclonal
• Immunogen: Recombinant yeast Urm1 protein.
• Specificity: This product is prepared from monospecific antiserum by a multi-step process which includes delipidation, salt fractionation and ion exchange chromatography followed by extensive dialysis against the buffer stated below.
  Assay by immunoelectrophoresis resulted in a single precipitin arc against anti-rabbit serum.
• Formulation: 0.02 M Potassium Phosphate, 0.15 M Sodium Chloride, pH 7.2, with 0.01% (w/v) Sodium Azide as preservative.
  State: Purified
  State: Lyophilized purified IgG fraction.
• Reconstitution Method: Restore with 0.1 ml of deionized water (or equivalent).
• Concentration: 5.0 mg/ml (by UV absorbance at 280 nm)
• Purification: Multi-step process.
• Background: Ubiquitin-like proteins fall into two classes: the first class, ubiquitin-like modifiers (UBLs) function as modifiers in a manner analogous to that of ubiquitin. Examples of UBLs are SUMO, Rub1 (also called Nedd8), Apg8 and Apg12. Proteins of the second class include parkin, RAD23 and DSK2, are designated ubiquitin-domain proteins (UDPs). These proteins contain domains that are related to ubiquitin but are otherwise unrelated to each other. In contrast to UBLs, UDPs are not conjugated to other proteins. Urm1 is a newly identified ubiquitin related modifier. Urm 1 is a 99-amino acid protein terminated with glycine-glycine. Target proteins are conjugated to Urm1 via its C-terminal glycine. Initially Urm1 forms a thioester with a novel E1-like protein, Uba4.
• Synonyms: URM-1, Ubiquitin-related modifier 1, C9orf74, YIL008W