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- W2166384959 abstract "N-ethylmaleimide (NEM) Lit 10-100 μM led to a strong inhibition of the auxin-induced elongation growth of colcoptile segments, while fusicoccin-enhanced growth was not affected. Growth inhibition occurred only if NEM and auxin were allowed to act simultaneously. Preincubation of plant segments with NEM in the absence of auxin caused no inhibition of a subsequent growth stimulation by auxin, whenever NEM was removed before the application of IAA. However, preincubation with NEM plus auxin led to a remaining growth inhibition, which could not be reversed by a second auxin incubation in the absence of NEM. Fusicoccin added to NEM- plus auxin-treated segments was able to restore growth. It is suggested that auxin causes the unmasking of essential SH-groups of a protein to which NEM links covalently. thus inhibiting the growth process. This assumption was further supported by labeling experiments wish [14C]-NEM using membranes of maize (Zea mays L. cv. Inraplus) coleoptiles. Two membrane fractions (S2= 480-1900 g; S4= 4300-15000 g) revealed a significantly higher [14C]-NEM labeling in the presence of auxin (2,4-diehlorophe-noxyacctic acid compared to 2,6 dichlorophenoxyacetic acid). This effect disappeared when the membranes were previously washed with EGTA [ethyleneglycolbis-(β-aminoethylether)-N,N,Nr′,N′-tetraacetic acid]. The auxin-induced sensitization of coleoptilc segments against thiol-reagents and the auxin-induced expression of SH-groups of proteins of isolated membranes from coleoptiles arc suggested to be events involved in the primary action of auxins." @default.
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- W2166384959 date "1988-02-01" @default.
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- W2166384959 title "Auxin-induced N-ethylmaleimide (NEM) effects on elongation growth of coleoptiles and auxin-induced [14C]-NEM labeling of membrane proteins" @default.
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- W2166384959 doi "https://doi.org/10.1111/j.1399-3054.1988.tb05837.x" @default.
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