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Plant Molecular Biology

, Volume 23, Issue 6, pp 1177–1185 | Cite as

Identification and molecular cloning of two homologues of protein phosphatase X from Arabidopsis thaliana

  • Encarna Pérez-Callejón
  • Antonio Casamayor
  • Gemma Pujol
  • Elisabet Clua
  • Albert Ferrer
  • Joaquín Ariño
Research Article

Abstract

In a recent paper [Ariño et al., Plant Mol Biol 21: 475–485 (1993)] we reported the amplification of a DNA fragment (AP-2) from the genome of Arabidopsis thaliana encoding an amino acid sequence corresponding to a Ser/Thr protein phosphatase distantly related to type 2A protein phosphatases. In this paper we report the use of the AP-2 fragment to isolate several cDNA clones from a leaf cDNA library. Two of these (EP 124 and Ep 129) largely overlap and contain the AP-2 sequence, whereas a third clone (EP 128) is different although very related in sequence (86% of identity). Clones EP 124/EP 129 and EP 128 were found to encode two highly related polypeptides (93% identity) of 305 residues, showing a very high identity (83%) to the catalytic subunit of protein phosphatase X (PPX) from rabbit. Therefore, they have been named PPX-1 (EP 124/EP 129) and PPX-2 (EP 128). Southern blot analysis of genomic DNA indicates that only these two genes encoding phosphatases closely related to PPX are present in the genome of A. thaliana. Both PPX-1 and PPX-2 are expressed at very low levels in A. thaliana flowers, leaves, stems and roots. The expression levels of four previously identified type 2A phosphatases are higher than those of PPX genes. PP2A-1 appears to be the major mRNA species detected in all the tissues analyzed.

Key words

A. thaliana protein phosphorylation Ser/Thr protein phosphatase cDNA cloning isoforms 

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Copyright information

© Kluwer Academic Publishers 1993

Authors and Affiliations

  • Encarna Pérez-Callejón
    • 1
  • Antonio Casamayor
    • 2
  • Gemma Pujol
    • 1
  • Elisabet Clua
    • 2
  • Albert Ferrer
    • 1
  • Joaquín Ariño
    • 2
  1. 1.Unitat de Bioquímica, Facultat de FarmàciaUniversitat de BarcelonaBarcelonaSpain
  2. 2.Departament de Bioquímica i Biologia Molecular, Facultat de VeterinàriaUniversitat Autònoma de BarcelonaBarcelonaSpain

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