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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Plant molecular biology 43 (2000), S. 719-733 
    ISSN: 1573-5028
    Keywords: Arabidopsis ; cytokinesis ; mutants ; phragmoplast ; vesicle trafficking
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Higher plants have evolved specific mechanisms for partitioning the cytoplasm of dividing cells. In the predominant mode of phragmoplast-assisted cytokinesis, a cell wall and flanking plasma membranes are made de novo from a transient membrane compartment, the cell plate, which in turn forms by vesicle fusion from the centre to the periphery of the dividing cell. Other modes of cytokinesis appear to occur in meiotic cells and developing gametophytes. Here we review recent progress in the analysis of plant cytokinesis, focusing on genetic studies in Arabidopsis which are beginning to identify structural and regulatory components of phragmoplast-assisted cytokinesis. Two classes of mutations have been described. In one class, the defects appear to be confined to cell plate formation, suggesting that the execution of cytokinesis is specifically affected. Mutations in the other class display more general defects in cell division. We also discuss possible roles of proteins that have been localised in cytokinetic cells but not characterised genetically. Finally, mutations affecting meiotic or gametophytic cell divisions suggest that mechanistically different modes of cytokinesis occur in higher plants.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Molecular genetics and genomics 250 (1996), S. 681-691 
    ISSN: 1617-4623
    Keywords: Key words Arabidopsis ; GNOM gene ; Intragenic complementation ; Conserved regions ; Yeast YEC2 gene
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  The GNOM gene is required for pattern formation along the main body axis of the embryo in the flowering plant Arabidopsis thaliana. Mutations in the GNOM gene alter the asymmetric division of the zygote and interfere with the formation of distinct apical-basal regions in the developing embryo. We have isolated the GNOM gene by positional cloning, characterised its structure and determined the molecular lesions in mutant alleles. Although the predicted 163 kDa GNOM protein has a conserved domain in common with the yeast secretory protein Sec7p, it is most closely related in size and overall similarity to the product of the yeast YEC2 gene, which is not essential for cell viability. Four fully complementing gnom alleles carry missense mutations in conserved regions, seven partially complementing alleles have premature stop codon mutations and two non-complementing alleles have splice-site lesions. Our results suggest that the GNOM protein acts as a complex of identical subunits and that partial complementation may involve low levels of full-length protein generated by inefficient translational read-through.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Molecular genetics and genomics 250 (1996), S. 681-691 
    ISSN: 1617-4623
    Keywords: Arabidopsis ; GNOM gene ; Intragenic complementation ; Conserved regions ; YeastYEC2 gene
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract TheGNOM gene is required for pattern formation along the main body axis of the embryo in the flowering plantArabidopsis thaliana. Mutations in theGNOM gene alter the asymmetric division of the zygote and interfere with the formation of distinct apical-basal regions in the developing embryo. We have isolated theGNOM gene by positional cloning, characterised its structure and determined the molecular lesions in mutant alleles. Although the predicted 163 kDa GNOM protein has a conserved domain in common with the yeast secretory protein Sec7p, it is most closely related in size and overall similarity to the product of the yeastYEC2 gene, which is not essential for cell viability. Four fully complementinggnom alleles carry missense mutations in conserved regions, seven partially complementing alleles have premature stop codon mutations and two non-complementing alleles have splice-site lesions. Our results suggest that the GNOM protein acts as a complex of identical subunits and that partial complementation may involve low levels of full-length protein generated by inefficient translational read-through.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
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