Anti-Protein phosphatase inhibitor 1 antibody [EP902Y] (ab40877)


  • Product name
    Anti-Protein phosphatase inhibitor 1 antibody [EP902Y]
    See all Protein phosphatase inhibitor 1 primary antibodies
  • Description
    Rabbit monoclonal [EP902Y] to Protein phosphatase inhibitor 1
  • Host species
  • Tested applications
    Suitable for: WB, IP, Flow Cyt, ICC/IF, IHC-Pmore details
  • Species reactivity
    Reacts with: Mouse, Rat, Human
  • Immunogen

    Synthetic peptide within Human Protein phosphatase inhibitor 1 aa 1-100 (N terminal). The exact sequence is proprietary.

  • Positive control
    • Brain tissue/lysate
  • General notes



    Our RabMAb® technology is a patented hybridoma-based technology for making rabbit monoclonal antibodies. For details on our patents, please refer to RabMab® patents

    This product is a recombinant rabbit monoclonal antibody.



Our Abpromise guarantee covers the use of ab40877 in the following tested applications.

The application notes include recommended starting dilutions; optimal dilutions/concentrations should be determined by the end user.

Application Abreviews Notes
WB 1/100000. Detects a band of approximately 27 kDa (predicted molecular weight: 19 kDa).
IP 1/50.
Flow Cyt 1/20.

ab172730 - Rabbit monoclonal IgG, is suitable for use as an isotype control with this antibody.

ICC/IF Use a concentration of 5 µg/ml.
IHC-P Use at an assay dependent concentration.


  • Function
    Inhibitor of protein-phosphatase 1. This protein may be important in hormonal control of glycogen metabolism. Hormones that elevate intracellular cAMP increase I-1 activity in many tissues. I-1 activation may impose cAMP control over proteins that are not directly phosphorylated by PKA. Following a rise in intracellular calcium, I-1 is inactivated by calcineurin (or PP2B). Does not inhibit type-2 phosphatases.
  • Sequence similarities
    Belongs to the protein phosphatase inhibitor 1 family.
  • Post-translational
    Phosphorylation of Thr-35 is required for activity.
  • Information by UniProt
  • Database links
  • Alternative names
    • I 1 antibody
    • I-1 antibody
    • I1 antibody
    • Inhibitor 1 antibody
    • IPP 1 antibody
    • IPP-1 antibody
    • IPP1 antibody
    • Ppp1r1a antibody
    • PPR1A_HUMAN antibody
    • Protein phosphatase 1 regulatory (inhibitor) subunit 1A antibody
    • Protein phosphatase 1 regulatory subunit 1A antibody
    • Protein phosphatase inhibitor 1 antibody
    see all


  • Anti-Protein phosphatase inhibitor 1 antibody [EP902Y] (ab40877) at 1/40000 dilution + Rat brain at 10 µg

    Predicted band size: 19 kDa
    Observed band size: 27 kDa (why is the actual band size different from the predicted?)

  • Immunohistochemical analysis of paraffin-embedded human normal brain tissue using ab40877 diluted 1:100.
  • ICC/IF image of ab40877 stained PC12 cells. The cells were 100% methanol fixed (5 min) and then incubated in 1%BSA / 10% normal goat serum / 0.3M glycine in 0.1% PBS-Tween for 1h to permeabilise the cells and block non-specific protein-protein interactions. The cells were then incubated with the antibody (ab40877, 5µg/ml) overnight at +4°C. The secondary antibody (green) was Alexa Fluor® 488 goat anti-rabbit IgG (H+L) used at a 1/1000 dilution for 1h. Alexa Fluor® 594 WGA was used to label plasma membranes (red) at a 1/200 dilution for 1h. DAPI was used to stain the cell nuclei (blue) at a concentration of 1.43µM.

  • Overlay histogram showing SH-SY5Y cells stained with ab40877 (red line). The cells were fixed with 4% paraformaldehyde (10 min) and then permeabilized with 0.1% PBS-Tween for 20 min. The cells were then incubated in 1x PBS / 10% normal goat serum / 0.3M glycine to block non-specific protein-protein interactions followed by the antibody (ab40877, 1/20 dilution) for 30 min at 22°C. The secondary antibody used was DyLight® 488 goat anti-rabbit IgG (H+L) (ab96899) at 1/500 dilution for 30 min at 22°C. Isotype control antibody (black line) was rabbit IgG (monoclonal) ( 1µg/1x106 cells) used under the same conditions. Acquisition of >5,000 events was performed. This antibody gave a positive signal in SH-SY5Y cells fixed with 80% methanol/permeabilized in 0.1% PBS-Tween used under the same conditions.


This product has been referenced in:
  • Ji Y  et al. Astragalosides increase the cardiac diastolic function and regulate the "Calcium sensing receptor-protein kinase C-protein phosphatase 1" pathway in rats with heart failure. Biomed Pharmacother 103:838-843 (2018). WB . Read more (PubMed: 29710499) »
  • Bond RC  et al. Reduced density and altered regulation of rat atrial L-type Ca(2+) current in heart failure. Am J Physiol Heart Circ Physiol 312:H384-H391 (2017). WB ; Mouse . Read more (PubMed: 27923791) »

See all 7 Publications for this product

Customer reviews and Q&As

The peptide used is derived from the general region of 1-25 aa at the N-terminus.

Thank you for your enquiry. We have never directly tested this, but according to sequence alignment, ab40877 will not cross react with darpp32. If you have any other questions, please do not hesitate to contact me.


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