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Misregulation of tetrapyrrole biosynthesis in transgenic tobacco seedlings expressing mammalian biliverdin reductase
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Franklin, Keara A., Linley, Philip J., Montgomery, Beronda L., Lagarias, J. Clark, Thomas, Brian, Jackson, Stephen D. and Terry, Matthew J. (2003) Misregulation of tetrapyrrole biosynthesis in transgenic tobacco seedlings expressing mammalian biliverdin reductase. The Plant Journal, Volume 35 (Number 6). pp. 717-728. doi:10.1046/j.1365-313X.2003.01840.x ISSN 0960-7412.
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Official URL: http://dx.doi.org/10.1046/j.1365-313X.2003.01840.x
Abstract
Previous studies have established that the expression of mammalian biliverdin IXα reductase (BVR) in transgenic tobacco (Nicotiana tabacum cv. Maryland Mammoth) resulted in the loss of photoregulatory activity of all phytochromes together with a pronounced chlorophyll deficiency. This study was undertaken to assess the contribution of BVR-mediated alteration of tetrapyrrole metabolism to the observed phenotypes of BVR transgenic plants. BVR expression in dark-grown plants led to the reduced accumulation of protochlorophyllide and transcripts for the two committed enzymes for 5-aminolevulinic acid (ALA) synthesis despite the marked increased capacity for synthesis of ALA. Together with the observation that Mg-porphyrin accumulation in dark-grown seedlings treated with an iron chelator was unaffected by BVR expression, these results indicate that BVR diverts tetrapyrrole metabolism toward heme synthesis while also reducing heme levels to de-repress ALA synthesis. By contrast with dark-grown seedlings, light-grown BVR plants showed a marked inhibition of ALA synthesis compared with wild-type plants – a result that was correlated with the disappearance of the CHL I subunit of Mg-chelatase and an increase in heme oxygenase protein levels. As transcript levels of all tetrapyrrole biosynthetic genes tested were not strongly affected by BVR expression, these results implicate misregulated tetrapyrrole metabolism to be a major mechanism for BVR-dependent inhibition of chlorophyll biosynthesis in light-grown plants.
Item Type: | Journal Article | ||||
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Life Sciences (2010- ) | ||||
Journal or Publication Title: | The Plant Journal | ||||
Publisher: | Wiley-Blackwell Publishing Ltd. | ||||
ISSN: | 0960-7412 | ||||
Official Date: | September 2003 | ||||
Dates: |
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Volume: | Volume 35 | ||||
Number: | Number 6 | ||||
Page Range: | pp. 717-728 | ||||
DOI: | 10.1046/j.1365-313X.2003.01840.x | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published | ||||
Access rights to Published version: | Restricted or Subscription Access |
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