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SignalSilence® VPRBP siRNA I

SignalSilence® VPRBP siRNA I #14010

Western Blotting

Western blot analysis of extracts from HL-60 cells, transfected with 100 nM SignalSilence® Control siRNA (Unconjugated) #6568 (-) or SignalSilence® VPRBP siRNA I (+), using VPRBP Antibody #13931 and GAPDH (D16H11) XP® Rabbit mAb #5174. The VPRBP Antibody confirms silencing of VPRBP expression, while the GAPDH (D16H11) XP® Rabbit mAb is used as a loading control.

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CST recommends transfection with 100 nM SignalSilence® VPRBP siRNA I 48 to 72 hours prior to cell lysis. For transfection procedure, follow protocol provided by the transfection reagent manufacturer. Please feel free to contact CST with any questions on use.

Each vial contains the equivalent of 100 transfections, which corresponds to a final siRNA concentration of 100 nM per transfection in a 24-well plate with a total volume of 300 μl per well.


VPRBP siRNA I is supplied in RNAse-free water. Aliquot and store at -20ºC.

SignalSilence® VPRBP siRNA I from Cell Signaling Technology (CST) allows the researcher to specifically inhibit VPRBP expression using RNA interference, a method whereby gene expression can be selectively silenced through the delivery of double stranded RNA molecules into the cell. All SignalSilence® siRNA products from CST are rigorously tested in-house and have been shown to reduce target protein expression by western analysis.

Oligonucleotide synthesis is monitored base by base through trityl analysis to ensure appropriate coupling efficiency. The oligo is subsequently purified by affinity-solid phase extraction. The annealed RNA duplex is further analyzed by mass spectrometry to verify the exact composition of the duplex. Each lot is compared to the previous lot by mass spectrometry to ensure maximum lot-to-lot consistency.

The HIV-1 viral protein R (Vpr)-binding protein (VPRBP, DCAF1) is a substrate-specific adaptor for the CUL4-based ubiquitin ligase complex that consists of CUL4A, RBX1, and DDB1 (1). VPRBP protein structure contains a central LIS1 homology (LisH) motif responsible for dimerization, and two carboxy-terminal WD-40 motifs involved in Vpr and DDB1 binding (2-4). Research studies demonstrate that VPRBP plays a role in hepatic lipid metabolism by promoting the ubiquitin-dependent proteasomal degradation of the TR4 nuclear receptor, which is involved in lipid homeostasis (5). The VPRBP protein plays a role in mammalian germ cell development through regulation of TET methylcytosine dioxygenase activation (6). Additional studies show that VPRBP exhibits kinase activity and phosphorylates histone H2A at Ser120, which blocks tumor suppressor gene transcription (7). The tumor suppressor Merlin/NF2 inhibits tumorigenesis through interaction with and suppression of the CUL4A-RBX1-DDB1-VPRBP complex (8).

  1. Lee, J. and Zhou, P. (2007) Mol Cell 26, 775-80.
  2. Le Rouzic, E. et al. (2007) Cell Cycle 6, 182-8.
  3. Zhang, S. et al. (2001) Gene 263, 131-40.
  4. Le Rouzic, E. et al. (2008) J Biol Chem 283, 21686-92.
  5. Yoshizawa, T. et al. (2014) Cell Metab 19, 712-21.
  6. Yu, C. et al. (2013) Science 342, 1518-21.
  7. Kim, K. et al. (2013) Mol Cell 52, 459-67.
  8. Li, W. et al. (2010) Cell 140, 477-90.
Entrez-Gene Id
Swiss-Prot Acc.
For Research Use Only. Not For Use In Diagnostic Procedures.

Cell Signaling Technology is a trademark of Cell Signaling Technology, Inc.
SignalSilence is a registered trademark of Cell Signaling Technology, Inc.
XP is a registered trademark of Cell Signaling Technology, Inc.

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Important Ordering Details

Custom Ordering Details: Product is assembled upon order. Please allow up to three business days for your product to be processed.

To Purchase # 14010S

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Product # Size Price
300 µl  (3 nmol) $ 256.0