Phosphatase Family HP2

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Phosphatase Classification: Fold PGM: Superfamily HP (histidine phosphatase): HP, branch2 family

Refer to Pfam ID PF00328 for general information.

ACPP

ACPP (acid phosphatase, prostate) is a prostate epithelium-specific differentiation antigen, and is decreased in prostate carcinomas. It has been show to downregulate prostate cell growth by dephosphorylating phosphotyrosine on c-ErbB-2, an oncoprotein in prostate cells [1]. His-12 and Asp-258 of ACPP, but not Cys-183 or Cys-281, are required for the phosphatase activity [2]. ACPP and its paralog ACP2 is found in metazoan, choanoflagellida, amoebozoa and some protists, but is absent from fungi and plants.

PXYLP1

PXYLP1 dephosphorylates xylose, a sugar, in the glycosaminoglycan-protein linkage region of proteoglycans [3]. It is found in most metazoan, absent from fungi, plants and most protists, but Entamoeba histolytica and Emiliania huxleyi have PXYLP1 like genes.


References

  1. Meng TC and Lin MF. Tyrosine phosphorylation of c-ErbB-2 is regulated by the cellular form of prostatic acid phosphatase in human prostate cancer cells. J Biol Chem. 1998 Aug 21;273(34):22096-104. DOI:10.1074/jbc.273.34.22096 | PubMed ID:9705354 | HubMed [ACPP_2]
  2. Zhang XQ, Lee MS, Zelivianski S, and Lin MF. Characterization of a prostate-specific tyrosine phosphatase by mutagenesis and expression in human prostate cancer cells. J Biol Chem. 2001 Jan 26;276(4):2544-50. DOI:10.1074/jbc.M006661200 | PubMed ID:11067847 | HubMed [ACPP_1]
  3. Koike T, Izumikawa T, Sato B, and Kitagawa H. Identification of phosphatase that dephosphorylates xylose in the glycosaminoglycan-protein linkage region of proteoglycans. J Biol Chem. 2014 Mar 7;289(10):6695-6708. DOI:10.1074/jbc.M113.520536 | PubMed ID:24425863 | HubMed [koike14]
All Medline abstracts: PubMed | HubMed