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  • 1
    Electronic Resource
    Electronic Resource
    Expression of multiple type 1 phosphoprotein phosphatases in Arabidopsis thaliana (1993)
    Springer
    Plant molecular biology 21 (1993), S. 307-316 
    Details
    ISSN: 1573-5028
    Keywords: protein phosphorylation ; multigene family
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Type 1 phosphoprotein Ser/Thr phosphatases (PP1) are highly conserved enzymes found in all eukaryotes. These enzymes have multiple functions in fungal and animal cells but little is known of their function and regulation in plants. Previous studies in our laboratory indicated that maize and Arabidopsis contain a family of PP1 genes and/or pseudogenes. In this study, we report the isolation of five distinct Arabidopsis cDNA clones (TOPP1, TOPP2, TOPP3, TOPP4 and TOPP5) which encode the catalytic subunit (PP1c) of type 1 protein phosphatases. Genomic Southern blot analyses indicate that these clones are the products of five distinct genes and that an additional 2–3 PP1c genes and/or pseudogenes may be present in the Arabidopsis genome. The derived amino acid sequences of the TOPP clones are very similar to published sequences of PP1c from animals, fungi and plants. Four of the TOPP amino acid sequences show unique structural features not observed in other PP1c sequences from fungi or animals. All of the TOPP genes are expressed in Arabidopsis roots, rosettes and flowers, although TOPP1, TOPP2 and TOPP3 appear to be expressed at higher levels in these tissues than TOPP4 and TOPP5.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00019946
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  • 2
    Electronic Resource
    Electronic Resource
    Molecular cloning and chromosomal mapping of type one serine/threonine protein phosphatases in Arabidopsis thaliana (1998)
    Springer
    Plant molecular biology 37 (1998), S. 471-481 
    Details
    ISSN: 1573-5028
    Keywords: chromosomal location ; multigene family ; phylogenetic analysis ; protein phosphorylation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Type one serine/threonine protein phosphatases (PP1s) have been implicated in various processes of plant growth and development. In all plant species studied, PP1s are encoded by multigene families. Previous studies in our laboratory identified five Arabidopsis thaliana PP1 genes (TOPP1, TOPP2, TOPP3, TOPP4 and TOPP5). In the present study, we report the isolation of three additional PP1 genes (TOPP6, TOPP7 and TOPP8). Southern blot analyses indicate that these three newly isolated genes are single-copy genes in A. thaliana genome. All the three genes are expressed in roots, rosettes and flowers, although their expression levels appear to be lower than those of the five previously identified TOPP genes. Six of the eight TOPP genes were mapped to different positions on four of five A. thaliana chromosomes. Sequence comparison revealed that TOPP genes belong to different subgroups of plant PP1 genes, suggesting that they may encode proteins with distinct functions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1005912413555
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    Paper (German National Licenses)
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