I1PP2A Detection Kit

Description: The I1PP2A Detection Kit includes 100 μg affinity-purified Anti-I1PP2A (GLO149-100) and an aliquot of highly purified I1PP2A (GLO140-001). The aliquot is provided in SDS sample buffer ready for use in five applications as positive control in Western blots. The polyclonal antibody was produced in rabbits to a synthetic peptide corresponding to residues 149-163 of human kidney I1PP2A.

Synonyms: Protein Phosphatase 2A Inhibitor Protein 1 Western Blot Detection Kit; Anti-I1 Detection Kit; I1PP2A is also termed: I1PP2A, PHAP-I, p32/33 and LANP.

BackgroundThe PP2A inhibitor proteins, I1PP2A and I2PP2A, were discovered in the laboratory of GloboZymes founder Dr. Zahi Damuni while he was a faculty member in the Department of Cellular and Molecular Physiology at Penn State College of Medicine. There has been progress since that time in numerous laboratories around the world demonstrating further the significance of these proteins in various diseases including cancer and Alzheimers, for example. I1PP2A (GLO140-001), also termed PHAP-I, p32/33 and LANP, is highly expressed in some cancers. Purified preparations of this oncoprotein inhibit all forms of protein phosphatase 2A (PP2A, GLO130-GLO132) tested to date in a substrate-selective manner. The purified preparations inhibit PP2A potently (ki ~ 0.1 nM) with myelin basic protein (MBP, GLO126-010MGLO126-025) and histone H1 but not with casein as substrate. In contrast, the preparations stimulate PP1 (GLO133-001) also in a substrate-selective manner. I1PP2A undergoes phosphorylation on serines and tyrosines in cells.


  1. Li M, Makkinje A, Damuni Z. (1996) "Molecular identification of I1PP2A, a novel potent heat-stable inhibitor protein of protein phosphatase 2A" Biochemistry 35, 6998-7002
  2. Vaesen, M. et al (1994) "Purification and characterization of two putative HLA class II associated proteins: PHAPI and PHAPII"Biol Chem Hoppe Seyler 375, 113-126
  3. Malek, S. N. et al (1990) "Identification and preliminary characterization of two related proliferation-associated nuclear phosphoproteins" J Biol Chem 265, 13400-13409
  4. Li, M., Damuni, Z. (1998) "I1PP2A and I2PP2A: Two Potent Protein Phosphatase 2A-Specific Inhibitor Proteins" Methods Mol Biol  93, 59-66
  5. Katayose, Y. et al (2000) "Protein Phosphatase 2A Inhibitors, I1PP2A and I2PP2A, Associate with and Modify the Substrate Specificity of Protein Phosphatase 1" J Biol Chem 275, 9209-9214
  6. Yu L-G et al (2004) “Protein Phosphatase 2A, a negative regulator of the ERK signaling pathway, is activated by tyrosine phosphorylation of Putative HLA Class II-associated Protein I (PHAPI)/pp32 in response to the antiproliferative lectin, Jacalin” J Biol Chem 279, 41377-41383

Related ProductsAnti-I1PP2A (50 μg)  ♦  Anti-I1PP2A (100 μg)  ♦  I1PP2A Detection Kit  ♦  I1PP2A  ♦  I1PP2A GST (1 μg)  ♦  I1PP2A GST (5 μg)  ♦ I2PP2A   ♦  I2PP2A GST (1 μg)  ♦  I2PP2A GST (5 μg)  ♦  I2PP2A(β)  ♦  PP2A1 ♦  PP2A2 ♦  PP2AC ♦  PP1C

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