Cloning and Characterization of Red Clover Polyphenol Oxidase cDNAs and Expression of Active Protein in Escherichia coli and Transgenic Alfalfa1[w]

Tipo de material: Texto

TextoSeries ; Plant Physiology, 136(2), p.3234-3244, 2004Trabajos contenidos:

Sullivan, M.L
Hatfield, R.D
Thoma, S.L
Samac, D.A

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Resumen: Red clover (Trifolium pratense)leaves contain high levels of polyphenol oxidase (PPO)activity and o-diphenol substrates. Wounding of leaves during harvest and ensiling results in browning of leaf tissues from activity of PPO on the o-diphenols. In association with browning, leaf proteins remain undegraded during ensiling, presumably due to PPO-generated o-quinone inhibition of leaf proteases. We cloned three red clover PPO cDNAs, PPO1, PPO2, and PPO3, from a leaf cDNA library. Sequence comparisons among the three red clover PPO clones indicated they are 87

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Red clover (Trifolium pratense)leaves contain high levels of polyphenol oxidase (PPO)activity and o-diphenol substrates. Wounding of leaves during harvest and ensiling results in browning of leaf tissues from activity of PPO on the o-diphenols. In association with browning, leaf proteins remain undegraded during ensiling, presumably due to PPO-generated o-quinone inhibition of leaf proteases. We cloned three red clover PPO cDNAs, PPO1, PPO2, and PPO3, from a leaf cDNA library. Sequence comparisons among the three red clover PPO clones indicated they are 87

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