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Aliases PPP2R1B, PP2A-Abeta, PR65B, protein phosphatase 2 scaffold subunit Abeta
External IDs MGI: 1920949 HomoloGene: 70244 GeneCards: PPP2R1B
RNA expression pattern
PBB GE PPP2R1B 202884 s at fs.png

PBB GE PPP2R1B 202886 s at fs.png

PBB GE PPP2R1B 222351 at fs.png
More reference expression data
Species Human Mouse
RefSeq (mRNA)



RefSeq (protein)



Location (UCSC) Chr 11: 111.73 – 111.77 Mb Chr 9: 50.85 – 50.89 Mb
PubMed search [1] [2]
View/Edit Human View/Edit Mouse

Serine/threonine-protein phosphatase 2A 65 kDa regulatory subunit A beta isoform is an enzyme that in humans is encoded by the PPP2R1B gene.[3][4][5]


This gene encodes a constant regulatory subunit of protein phosphatase 2. Protein phosphatase 2 is one of the four major Ser/Thr phosphatases, and it is implicated in the negative control of cell growth and division. It consists of a common heteromeric core enzyme, which is composed of a catalytic subunit and a constant regulatory subunit, that associates with a variety of regulatory subunits. The constant regulatory subunit A serves as a scaffolding molecule to coordinate the assembly of the catalytic subunit and a variable regulatory B subunit. This gene encodes a beta isoform of the constant regulatory subunit A. Defects in this gene could be the cause of some lung and colon cancers. At least two transcript variants encoding different isoforms have been found for this gene.[5]


PPP2R1B has been shown to interact with:


  1. ^ "Human PubMed Reference:". 
  2. ^ "Mouse PubMed Reference:". 
  3. ^ Hemmings BA, Adams-Pearson C, Maurer F, Müller P, Goris J, Merlevede W, Hofsteenge J, Stone SR (Apr 1990). "alpha- and beta-forms of the 65-kDa subunit of protein phosphatase 2A have a similar 39 amino acid repeating structure". Biochemistry. 29 (13): 3166–73. doi:10.1021/bi00465a002. PMID 2159327. 
  4. ^ Baysal BE, Farr JE, Goss JR, Devlin B, Richard CW (Sep 1998). "Genomic organization and precise physical location of protein phosphatase 2A regulatory subunit A beta isoform gene on chromosome band 11q23". Gene. 217 (1-2): 107–16. doi:10.1016/S0378-1119(98)00350-3. PMID 9795170. 
  5. ^ a b "Entrez Gene: PPP2R1B protein phosphatase 2 (formerly 2A), regulatory subunit A, beta isoform". 
  6. ^ a b c d e Zhou J, Pham HT, Ruediger R, Walter G (Jan 2003). "Characterization of the Aalpha and Abeta subunit isoforms of protein phosphatase 2A: differences in expression, subunit interaction, and evolution". The Biochemical Journal. 369 (Pt 2): 387–98. doi:10.1042/BJ20021244. PMC 1223084Freely accessible. PMID 12370081. 
  7. ^ a b Goudreault M, D'Ambrosio LM, Kean MJ, Mullin MJ, Larsen BG, Sanchez A, Chaudhry S, Chen GI, Sicheri F, Nesvizhskii AI, Aebersold R, Raught B, Gingras AC (Jan 2009). "A PP2A phosphatase high density interaction network identifies a novel striatin-interacting phosphatase and kinase complex linked to the cerebral cavernous malformation 3 (CCM3) protein". Molecular & Cellular Proteomics. 8 (1): 157–71. doi:10.1074/mcp.M800266-MCP200. PMC 2621004Freely accessible. PMID 18782753. 
  8. ^ Kamibayashi C, Lickteig RL, Estes R, Walter G, Mumby MC (Oct 1992). "Expression of the A subunit of protein phosphatase 2A and characterization of its interactions with the catalytic and regulatory subunits". The Journal of Biological Chemistry. 267 (30): 21864–72. PMID 1328247. 
  9. ^ a b c d e McCright B, Rivers AM, Audlin S, Virshup DM (Sep 1996). "The B56 family of protein phosphatase 2A (PP2A) regulatory subunits encodes differentiation-induced phosphoproteins that target PP2A to both nucleus and cytoplasm". The Journal of Biological Chemistry. 271 (36): 22081–9. doi:10.1074/jbc.271.36.22081. PMID 8703017. 

Further reading[edit]

  • Zolnierowicz S (Oct 2000). "Type 2A protein phosphatase, the complex regulator of numerous signaling pathways". Biochemical Pharmacology. 60 (8): 1225–35. doi:10.1016/S0006-2952(00)00424-X. PMID 11007961. 
  • Kamibayashi C, Lickteig RL, Estes R, Walter G, Mumby MC (Oct 1992). "Expression of the A subunit of protein phosphatase 2A and characterization of its interactions with the catalytic and regulatory subunits". The Journal of Biological Chemistry. 267 (30): 21864–72. PMID 1328247. 
  • Tung HY, De Rocquigny H, Zhao LJ, Cayla X, Roques BP, Ozon R (Jan 1997). "Direct activation of protein phosphatase-2A0 by HIV-1 encoded protein complex NCp7:vpr". FEBS Letters. 401 (2-3): 197–201. doi:10.1016/S0014-5793(96)01470-6. PMID 9013886. 
  • Adler HT, Nallaseth FS, Walter G, Tkachuk DC (Nov 1997). "HRX leukemic fusion proteins form a heterocomplex with the leukemia-associated protein SET and protein phosphatase 2A". The Journal of Biological Chemistry. 272 (45): 28407–14. doi:10.1074/jbc.272.45.28407. PMID 9353299. 
  • Ruediger R, Brewis N, Ohst K, Walter G (Nov 1997). "Increasing the ratio of PP2A core enzyme to holoenzyme inhibits Tat-stimulated HIV-1 transcription and virus production". Virology. 238 (2): 432–43. doi:10.1006/viro.1997.8873. PMID 9400615. 
  • Wang SS, Esplin ED, Li JL, Huang L, Gazdar A, Minna J, Evans GA (Oct 1998). "Alterations of the PPP2R1B gene in human lung and colon cancer". Science. 282 (5387): 284–7. doi:10.1126/science.282.5387.284. PMID 9765152. 
  • Takahashi M, Shibata H, Shimakawa M, Miyamoto M, Mukai H, Ono Y (Jun 1999). "Characterization of a novel giant scaffolding protein, CG-NAP, that anchors multiple signaling enzymes to centrosome and the golgi apparatus". The Journal of Biological Chemistry. 274 (24): 17267–74. doi:10.1074/jbc.274.24.17267. PMID 10358086. 
  • Campbell IG, Manolitsas T (Nov 1999). "Absence of PPP2R1B gene alterations in primary ovarian cancers". Oncogene. 18 (46): 6367–9. doi:10.1038/sj.onc.1203070. PMID 10597236. 
  • Takagi Y, Futamura M, Yamaguchi K, Aoki S, Takahashi T, Saji S (Aug 2000). "Alterations of the PPP2R1B gene located at 11q23 in human colorectal cancers". Gut. 47 (2): 268–71. doi:10.1136/gut.47.2.268. PMC 1727986Freely accessible. PMID 10896920. 
  • Baysal BE, Willett-Brozick JE, Taschner PE, Dauwerse JG, Devilee P, Devlin B (Feb 2001). "A high-resolution integrated map spanning the SDHD gene at 11q23: a 1.1-Mb BAC contig, a partial transcript map and 15 new repeat polymorphisms in a tumour-suppressor region". European Journal of Human Genetics. 9 (2): 121–9. doi:10.1038/sj.ejhg.5200585. PMID 11313745. 
  • Ruediger R, Pham HT, Walter G (Apr 2001). "Alterations in protein phosphatase 2A subunit interaction in human carcinomas of the lung and colon with mutations in the A beta subunit gene". Oncogene. 20 (15): 1892–9. doi:10.1038/sj.onc.1204279. PMID 11313937. 
  • Yokoyama N, Reich NC, Miller WT (Jun 2001). "Involvement of protein phosphatase 2A in the interleukin-3-stimulated Jak2-Stat5 signaling pathway". Journal of Interferon & Cytokine Research. 21 (6): 369–78. doi:10.1089/107999001750277844. PMID 11440634. 
  • Elder RT, Yu M, Chen M, Zhu X, Yanagida M, Zhao Y (Sep 2001). "HIV-1 Vpr induces cell cycle G2 arrest in fission yeast (Schizosaccharomyces pombe) through a pathway involving regulatory and catalytic subunits of PP2A and acting on both Wee1 and Cdc25". Virology. 287 (2): 359–70. doi:10.1006/viro.2001.1007. PMID 11531413. 
  • Yang J, Fan GH, Wadzinski BE, Sakurai H, Richmond A (Dec 2001). "Protein phosphatase 2A interacts with and directly dephosphorylates RelA". The Journal of Biological Chemistry. 276 (51): 47828–33. doi:10.1074/jbc.M106103200. PMC 2665282Freely accessible. PMID 11591705. 
  • Strack S, Ruediger R, Walter G, Dagda RK, Barwacz CA, Cribbs JT (Jun 2002). "Protein phosphatase 2A holoenzyme assembly: identification of contacts between B-family regulatory and scaffolding A subunits". The Journal of Biological Chemistry. 277 (23): 20750–5. doi:10.1074/jbc.M202992200. PMID 11929880. 
  • Hemmer S, Wasenius VM, Haglund C, Zhu Y, Knuutila S, Franssila K, Joensuu H (Apr 2002). "Alterations in the suppressor gene PPP2R1B in parathyroid hyperplasias and adenomas". Cancer Genetics and Cytogenetics. 134 (1): 13–7. doi:10.1016/S0165-4608(01)00597-0. PMID 11996789.