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- W2076636619 abstract "Abstract The stimulation of o -diphenolase (× 13), peroxidase (× 6) and ribonuclease (× 25) activities was demonstrated in excised wheat embryos cultured for 48 hr. Cycloheximide (5 μg/ml) completely blocked leucine-[ 3 H] incorporation into protein fractions and simultaneously inhibited the activity of the three enzymes. Increasing concentrations of cycloheximide (2 and 4 μg/ml) caused a progressive inhibition of o -di phenolase activity of fast migrating multiple forms together with a proportional loss of leucine-[ 3 H] incorporation in the region of these activity bands. This indicated the involvement of fresh protein synthesis for enhanced o -diphenolase activity. However, fresh transcription did not seem obligatory for enzyme stimulation. Actinomycin D failed to inhibit the activities of o -diphenolase, peroxidase and RNase, although it caused a strong inhibition (70%) of uracil-[ 14 C] incorporation into the RNA fraction without affecting leucine-[ 3 H] incorporation into proteins. This suggested a translational control of enzyme stimulation which is supported by conserved messengers present in the ungerminated wheat embryos. Another inhibitor of RNA synthesis (6-methylpurine) strongly inhibited (78%) uracil-[ 14 C] incorporation into RNA fraction, but unlike actinomycin D, it caused a severe inhibition (75%) of o -diphenolase activity and also retarded (76%) leucine-[ 3 H] incorporation into protein fractions. Cordycepin caused a mild inhibition (25%) of o -diphenolase activity together with a simultaneous inhibition of adenine -[ 14 C] incorporation into RNA (78%) and that of leucine-[ 3 H] incorporation (30% inhibition) into protein fraction. The inhibition of o -diphenolase activity by 6-methylpurine and cordycepin is probably due to a direct block of translation of conserved message in wheat embryos." @default.
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- W2076636619 date "1976-01-01" @default.
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- W2076636619 title "Enzyme synthesis by conserved messengers in germinating wheat embryos" @default.
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- W2076636619 doi "https://doi.org/10.1016/s0031-9422(00)97433-8" @default.
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