Mammalian cells express two distinct but highly homologous cullin-4 proteins, cullin-4A and cullin-4B. Cul4A and Cul4B form individual E3 ligases. In contrast to Cul4A, Cul4B has been shown to be localized to the nucleus.
애플리케이션
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.
생화학적/생리학적 작용
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.
Cullin-4B facilitates the transfer of damaged-DNA binding protein 1 (DDB1) into the nucleus independently of DDB2. In contrast to cullin-4A (Cul4A), cullin-4B (Cul4B) does not ubiquitinate DDB2.
표적 설명
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
물리적 형태
Solution in 0.01 M phosphate buffered saline, pH 7.4, containing 15 mM sodium azide.
면책조항
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Cullin 4B (Cul4B), a scaffold protein that assembles the ubiquitin ligase complex, is involved in a wide variety of physiological and developmental processes, such as cell cycle progression, DNA damage response and gene expression regulation. Cul4B is overexpressed in various
The Xeroderma Pigmentosum Group E Gene Product DDB2 Is a Specific Target of Cullin 4A in Mammalian Cells
Nag A, et al.
Molecular and Cellular Biology, 21(20), 6738-6747 (2001)
Journal of biosciences, 32(6), 1133-1138 (2007-10-24)
Beta-catenin is the key transducer of Wingless-type MMTV integration site family member (Wnt) signalling, upregulation of which is the cause of cancer of the colon and other tissues. In the absence of Wnt signals, beta-catenin is targeted to ubiquitin-proteasome-mediated degradation.
Journal of biosciences, 30(3), 329-337 (2005-07-30)
Heat induced differentiation of mouse embryonal carcinoma cells PCC4 has been reported earlier. We have further characterized the phenotype of the differentiated cells and by DD-RT-PCR identified several partial cDNAs that are differentially expressed during differentiation. Nucleotide homology search revealed
Given that colorectal cancer stem cells (CCSCs) play key roles in the tumor dormancy, metastasis, and relapse, targeting CCSCs is a promising strategy in cancer therapy. Here, we aimed to identify the new regulators of CCSCs and found that Cullin