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Various elements of the MAP kinase module have been isolated in plants. We describe here the characterisation of 14 new plant cDNAs and genes encoding putative MAP kinase kinase kinases (MAP3Ks) related to the MEKK/STE11 and RAF protein kinases. Plant MAP3Ks are characterised by a variety of primary structures conserved within closely related proteins. Southern blot analysis suggests that plant MAP3Ks...
Arabidopsis thaliana contains at least four genes that are predicted to encode polypeptides related to the RPB5 subunit found in yeast and human RNA polymerase II. This subunit has been shown to be the largest subunit common to yeast RNA polymerases I, II, and III (RPABC27). More than one of these genes is expressed in Arabidopsis suspension culture cells, but only one of the encoded polypeptides...
The increasing number of reports describing plant MAP kinase signalling components reflects the cardinal role that MAP kinase pathways are likely to play during plant growth and development. Relationship and structural analyses of plant MAP kinase kinase kinase related cDNAs and genes established, on one hand, the PMEKKs, which may be distinguished into the α, β, γ, and ζ groups, and, on the other...
In order to analyze the organization of genes located at the 100 map unit of chromosome 1, we screened cDNAs hybridized with approximately 300kb contiguous DNA using four P1 clones and one YAC clone. A total of 40 kinds of cDNA were isolated, and their entire sequences were determined. A comparison with the GenBank/EMBL database indicated that three of the cDNAs have been found in Arabidopsis, and...
Screening of cDNA libraries at low stringency and complete sequencing of EST clones with homology to thioredoxins allowed us to characterize five new prokaryotic type Arabidopsis thaliana thioredoxins. All present N-terminal extensions with characteristics of transit peptides. Four are clustered in a phylogenetic tree with the chloroplastic thioredoxin m from red and green algae and higher plants,...
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