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- W1775384299 abstract "ABSTRACT Much attention has been paid to the signal sequences of eukaryotic protoporphyrinogen oxidases (protoxes); both the organelles targeted by protoxes and the role of protoxes in conferring resistance against protox‐inhibiting herbicides, such as oxyfluorfen, have been examined. However, there have been no reports on the translocation of prokaryotic protoxes. This study investigated the targeting ability of Myxococcus xanthus protox in vitro and in vivo . In an in vitro translocation assay using a dual import system, M . xanthus protein was detected in chloroplasts and mitochondria, suggesting that the M . xanthus protox protein was targeted into both organelles. In order to confirm the in vitro dual targeting ability of M . xanthus , we used a stable transgenic strategy to investigate dual targeting in vivo . In transgenic rice plants overexpressing M . xanthus protox, M . xanthus protox antibody cross‐reacted with proteins with predicted molecular masses of 50 kDa from both chloroplasts and mitochondria, and this in vivo transgene expression corresponded to a prominent increase in chloroplastic and mitochondrial protox activity. Seeds from the transgenic lines M4 and M7 germinated in solid Murashige and Skoog media of up to 500 µ m of oxyfluorfen, whereas wild‐type seeds did not germinate in 1 µ m . After 4‐week‐old‐rice plants were treated with oxyfluorfen for 3 d, lines M4 and M7 exhibited normal growth, whereas the wild‐type line was severely bleached and necrotized. The herbicidal resistance is attributed to the insignificant accumulation of photodynamic protoporphyrin IX in cytosol because the high chloroplastic and mitochondrial protox activity in oxyfluorfen‐treated transgenic lines, compared with that in oxyfluorfen‐treated and untreated wild‐type plants, metabolizes protoporphyrinogen IX to chlorophyll and heme. A practical application of the dual targeting of M . xanthus protox for obtaining outstanding resistance to peroxidizing herbicides is discussed." @default.
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- W1775384299 date "2004-10-25" @default.
- W1775384299 modified "2023-10-11" @default.
- W1775384299 title "Dual targeting of Myxococcus xanthus protoporphyrinogen oxidase into chloroplasts and mitochondria and high level oxyfluorfen resistance" @default.
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- W1775384299 doi "https://doi.org/10.1111/j.1365-3040.2004.01247.x" @default.
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