Enabling Protein Degradation Drug Discovery

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  • Name
    Catalogue Number
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  • Name:
    Polyubiquitylated conjugates, mAb (FK1)
    Catalogue Number:
    500 µg
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  • Species
  • Source
    BALB/C Mouse implantation ascites
  • Quantity
    500 µg
  • Storage
  • Concentration
    1 mg/ml
  • Formulation
    10mM phosphate buffer, 0.15M NaCl PH7.4, 0.1% sodium azide
  • Molecular Weight
  • Stability
    12 months at -20°C; aliquot as required
  • Protein Sequence
  • QA; Protein Identification
  • QA; Activity
    Anti-Polyubiquitylated Conjugates mAb (FK1) Antibody Activity Assay: The activity of anti-polyubiquitylated conjugates mAb (FK1) antibody was tested for its ability to recognise polyubiquitin chains (Lane 3) but not mono-ubiquitin conjugates or free ubiquitin (Lanes 1 and 2). By Western blotting the specific recognition of polyubiquitin conjugates by the anti-polyubiquitylated conjugates mAb (FK1) over mono-ubiquitin conjugates (Di-ubiquitin) or free ubiquitin was demonstrated (Figure1). In a priming and extension assay containing, UBE1 [6His-tagged] (Cat# 61-0001), UBE2W [6His-tagged] (Cat# 62-0085), UBE2N [untagged] (Cat# 62-0047), UBE2V1 [untagged] (Cat# 62-0059), Ubiquitin (Cat# 60-0001), CHIP [untagged] (Cat# 63-0003) and ATP. Using the antipolyubiquitylated conjugates mAb (FK1) antibody, detection of polyubiquitin chains extending from mono-ubiquitylated CHIP (Lane 1) and free chains generated by UBE2N/UBE2V1 in the presence of CHIP (Lane 3) were observed (Figure 2).

The anti-polyubiquitylated conjugates mAb (FK1) demonstrates specific recognition for polyubiquitin protein conjugates but shows no reactivity with monoubiquitylated proteins or free ubiquitin (Fujimoro et al. 1994). The antipolyubiquitylated conjugates mAb (FK1) has been extensively characterised and used not only to investigate polyubiquitin chain formation on proteins by Western blotting but also in the detection of intracellular polyubiquitin chains in immunoassays (Takada et al. 1995;   Fujimoro et al. 2005).

Fujimuro M, Sawada H, Yokosawa H (1994) Production and characterization of monoclonal antibodies specific to multiubiquitin chains of polyubiquitinated proteins. FEBS Lett 349 173-180.
Takada K, Nasu H, Hibi N, Tsukada Y, Ohkawa K, Fujimuro M,Sawada H, Yokosawa H (1995) Immunoassay for the quantification of intracellular multi-ubiquitin chains. Eur J Biochem 233 42-47.
Fujimuro M, Yokosawa H (2005) Production of antipolyubiquitin monoclonal antibodies and their use for characterization and isolation of polyubiquitinated proteins. Methods Enzymol 399 75-86.