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Proceedings of the National Academy of Sciences of the United States of America, volume 109, issue 40, pages 16383-16388

Completion of the core β-oxidative pathway of benzoic acid biosynthesis in plants

Anthony V Qualley 1
Joshua R. Widhalm 1
Funmilayo Adebesin 2
Christine M Kish 1
Natalia Dudareva 1, 2
Publication typeJournal Article
Publication date2012-09-17
Quartile SCImago
Q1
Quartile WOS
Q1
Impact factor11.1
ISSN00278424, 10916490
Multidisciplinary
Abstract

Despite the importance of benzoic acid (BA) as a precursor for a wide array of primary and secondary metabolites, its biosynthesis in plants has not been fully elucidated. BA formation from phenylalanine requires shortening of the C 3 side chain by two carbon units, which can occur by a non–β-oxidative route and/or a β-oxidative pathway analogous to the catabolism of fatty acids. Enzymes responsible for the first and last reactions of the core BA β-oxidative pathway (cinnamic acid → cinnamoyl-CoA → 3-hydroxy-3-phenylpropanoyl-CoA → 3-oxo-3-phenylpropanoyl-CoA → BA-CoA) have previously been characterized in petunia, a plant with flowers rich in phenylpropanoid/benzenoid volatile compounds. Using a functional genomics approach, we have identified a petunia gene encoding cinnamoyl-CoA hydratase-dehydrogenase ( PhCHD ), a bifunctional peroxisomal enzyme responsible for two consecutively occurring unexplored intermediate steps in the core BA β-oxidative pathway. PhCHD spatially, developmentally, and temporally coexpresses with known genes in the BA β-oxidative pathway, and correlates with emission of benzenoid volatiles. Kinetic analysis of recombinant PhCHD revealed it most efficiently converts cinnamoyl-CoA to 3-oxo-3-phenylpropanoyl-CoA, thus forming the substrate for the final step in the pathway. Down-regulation of PhCHD expression in petunia flowers resulted in reduced CHD enzyme activity, as well as decreased formation of BA-CoA, BA and their derived volatiles. Moreover, transgenic lines accumulated the PhCHD substrate cinnamoyl-CoA and the upstream pathway intermediate cinnamic acid. Discovery of PhCHD completes the elucidation of the core BA β-oxidative route in plants, and together with the previously characterized CoA-ligase and thiolase enzymes, provides evidence that the whole pathway occurs in peroxisomes.

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Qualley A. V. et al. Completion of the core β-oxidative pathway of benzoic acid biosynthesis in plants // Proceedings of the National Academy of Sciences of the United States of America. 2012. Vol. 109. No. 40. pp. 16383-16388.
GOST all authors (up to 50) Copy
Qualley A. V., Widhalm J. R., Adebesin F., Kish C. M., Dudareva N. Completion of the core β-oxidative pathway of benzoic acid biosynthesis in plants // Proceedings of the National Academy of Sciences of the United States of America. 2012. Vol. 109. No. 40. pp. 16383-16388.
RIS |
Cite this
RIS Copy
TY - JOUR
DO - 10.1073/pnas.1211001109
UR - https://doi.org/10.1073/pnas.1211001109
TI - Completion of the core β-oxidative pathway of benzoic acid biosynthesis in plants
T2 - Proceedings of the National Academy of Sciences of the United States of America
AU - Qualley, Anthony V
AU - Widhalm, Joshua R.
AU - Adebesin, Funmilayo
AU - Kish, Christine M
AU - Dudareva, Natalia
PY - 2012
DA - 2012/09/17 00:00:00
PB - Proceedings of the National Academy of Sciences (PNAS)
SP - 16383-16388
IS - 40
VL - 109
SN - 0027-8424
SN - 1091-6490
ER -
BibTex |
Cite this
BibTex Copy
@article{2012_Qualley,
author = {Anthony V Qualley and Joshua R. Widhalm and Funmilayo Adebesin and Christine M Kish and Natalia Dudareva},
title = {Completion of the core β-oxidative pathway of benzoic acid biosynthesis in plants},
journal = {Proceedings of the National Academy of Sciences of the United States of America},
year = {2012},
volume = {109},
publisher = {Proceedings of the National Academy of Sciences (PNAS)},
month = {sep},
url = {https://doi.org/10.1073/pnas.1211001109},
number = {40},
pages = {16383--16388},
doi = {10.1073/pnas.1211001109}
}
MLA
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MLA Copy
Qualley, Anthony V., et al. “Completion of the core β-oxidative pathway of benzoic acid biosynthesis in plants.” Proceedings of the National Academy of Sciences of the United States of America, vol. 109, no. 40, Sep. 2012, pp. 16383-16388. https://doi.org/10.1073/pnas.1211001109.
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