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  • C9995 - Anti-Cullin-4B antibody produced in rabbit

C9995 Sigma

Anti-Cullin-4B antibody produced in rabbit

~1.0 mg/mL, affinity isolated antibody, buffered aqueous solution

Synonym: Anti-Cul4B, Anti-MRXHF2, Anti-MRXSC, Anti-SFM2



Related Categories Alphabetical Index, Antibodies, Antibodies for Cell Biology, Antibodies to E1,E2,E3 Ligase, Antibodies to Protein Degradation,
species reactivity   human
application(s)   western blot: 0.7-1.5 μg/mL using HEK-293T cells expressing human Cullin-4B.
clone   polyclonal
concentration   ~1.0 mg/mL
antibody form   affinity isolated antibody
form   buffered aqueous solution
mol wt   antigen mol wt ~100 kDa
shipped in   dry ice
storage temp.   −20°C
Gene Information   human ... CUL4B(8450)
mouse ... Cul4b(72584)
rat ... Cul4b(302502)
biological source   rabbit
conjugate   unconjugated



synthetic peptide corresponding to amino acids 40-59 of human cullin-4B, conjugated to KLH. The corresponding sequence is identical in rat and mouse cullin-4B and is not found in the homolog cullin-4A.

Antigen Background

Cullin-4B forms a complex that functions as an E3 ubiquitin ligase and catalyzes the polyubiquitination of specific protein substrates in the cell. The protein interacts with a ring finger protein, and is required for the proteolysis of several regulators

Physical form

Solution in 0.01 M phos­phate buffered saline, pH 7.4, containing 15 mM sodium azide.


Anti-Cullin-4B antibody produced in rabbit is suitable for western blotting at a working concentration of 0.7-1.5 μg/mL using HEK-293T cells expressing human Cullin-4B. The antibody was used for immunoblotting in a study to demonstrate that CUL4B E3 ubiquitin ligase plays a key role in targeting Jab1 (Jun activation domain-binding protein) for degradation and regulates bone morphogenetic protein signaling.

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Biochem/physiol Actions

Cullin-4 (Cul4) proteins are the core components of ubiquitin E3 ligases that regulate cell cycle, genome stability and DNA replication. Cul4B functions as an E3 ligase involved in selecting specific targets for ubiquitylation. It associates with damage-specific DNA binding proteins DDB1 and DDB2 (UV-damaged DNA) and functions as a substrate-recruiting factor for Cul4B E3 ligases. Cul4B ubiquitylates several target proteins including β-catenin, cyclin E, and histone H2A Mutations in this gene has been associated with x-linked mental retardation.

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Safety Information

Personal Protective Equipment  Eyeshields, Gloves, half-mask respirator (US), multi-purpose combination respirator cartridge (US)
RIDADR  NONH for all modes of transport
Protocols & Articles

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Keywords: Amplification, Buffers, Cell biology, Enzyme-linked immunosorbent assay, Immunofluorescence, Immunohistochemistry, Immunoprecipitation, Molecular biology, Phosphorylations, Purification, Western blot

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C0371 Anti-Cullin-4A antibody produced in rabbit, ~1.5 mg/mL, affinity isolated antibody, buffered aqueous solution

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