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6 rezultate
Induction of cysteine and serine proteases during xylogenesis in Zinnia elegans.
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The terminal process of xylogenesis, autolysis, is essential for the formulation of a tubular system for conduction of water and solutes throughout the whole plant. Several hydrolase types are implicated in autolysis responsible for the breakdown of cytoplasm. Here, we characterize p48h-17 cDNA from
Caspase inhibitors affect the kinetics and dimensions of tracheary elements in xylogenic Zinnia (Zinnia elegans) cell cultures.
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BACKGROUND
The xylem vascular system is composed of fused dead, hollow cells called tracheary elements (TEs) that originate through trans-differentiation of root and shoot cambium cells. TEs undergo autolysis as they differentiate and mature. The final stage of the formation of TEs in plants is the
Transient and specific expression of a cysteine endopeptidase associated with autolysis during differentiation of Zinnia mesophyll cells into tracheary elements.
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Endopeptidase activities during the differentiation of Zinnia cells into tracheary elements (TEs) were examined with several peptidyl 4-methyl-7-coumarylamido (MCA) as substrates. The activity that hydrolysed carbobenzoxy-Phe-Arg-MCA (Z-Phe-Arg-MCA) at pH 5 increased in a differentiation-related
A Secreted Factor Inducs Cell Expansion and Formation of Metaxylem-Like Tracheary Elements in Xylogenic Suspension Cultures of Zinnia.
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Conditioned medium from mesophyll cell-suspension cultures of Zinnia elegans L. has striking effects on cell expansion and tracheary element differentiation when applied to cultures of freshly isolated mesophyll cells. These effects include (a) induction of early cell expansion, (b) delay in
Post-translational modifications of the basic peroxidase isoenzyme from Zinnia elegans.
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The major basic peroxidase (ZePrx) from Zinnia elegans suspension cell cultures was purified and cloned. The purification resolved ZePrxs in two isoforms (ZePrx33.44 and ZePrx34.70), whose co-translational and post-translational modifications are characterized. Based on the N-terminal sequence
Proteasome inhibitors prevent tracheary element differentiation in zinnia mesophyll cell cultures
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To determine whether proteasome activity is required for tracheary element (TE) differentiation, the proteasome inhibitors clasto-lactacystin beta-lactone and carbobenzoxy-leucinyl-leucinyl-leucinal (LLL) were used in a zinnia (Zinnia elegans) mesophyll cell culture system. The addition of
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