Making light of it: the role of plant haem oxygenases in phytochrome chromophore synthesis
Making light of it: the role of plant haem oxygenases in phytochrome chromophore synthesis
The haem oxygenase (HO) enzyme catalyses the oxidation of haem to biliverdin IXa, CO and Fe2+, and performs a wide variety of roles in Nature, including degradation of haem from haemoglobin, iron acquisition and phycobilin biosynthesis. In plants, HOs are required for the synthesis of the chromophore of the phytochrome family of photoreceptors. There are four HO genes in the Arabidopsis genome. Analysis of a mutant deficient in HO1 (the hy1 mutant) has demonstrated that this plastid-localized protein is the major HO in the phytochrome chromophore synthesis pathway. HO2 may also have a minor role in this pathway, but our understanding of the divergent roles of this small gene family is still far from complete.
biliverdin, chloroplasts, light and plastid signalling, photoreceptor, tetrapyrroles
604-609
Terry, M.J.
a8c2cd6b-8d35-4053-8d77-3841c2427c3b
Linley, P.J.
31574fdd-77ae-4ed1-af05-0f4bc271424a
Kohchi, T.
4f720505-ce7a-4264-b5b6-d7f7899d256d
August 2002
Terry, M.J.
a8c2cd6b-8d35-4053-8d77-3841c2427c3b
Linley, P.J.
31574fdd-77ae-4ed1-af05-0f4bc271424a
Kohchi, T.
4f720505-ce7a-4264-b5b6-d7f7899d256d
Terry, M.J., Linley, P.J. and Kohchi, T.
(2002)
Making light of it: the role of plant haem oxygenases in phytochrome chromophore synthesis.
Biochemical Society Transactions, 30, .
Abstract
The haem oxygenase (HO) enzyme catalyses the oxidation of haem to biliverdin IXa, CO and Fe2+, and performs a wide variety of roles in Nature, including degradation of haem from haemoglobin, iron acquisition and phycobilin biosynthesis. In plants, HOs are required for the synthesis of the chromophore of the phytochrome family of photoreceptors. There are four HO genes in the Arabidopsis genome. Analysis of a mutant deficient in HO1 (the hy1 mutant) has demonstrated that this plastid-localized protein is the major HO in the phytochrome chromophore synthesis pathway. HO2 may also have a minor role in this pathway, but our understanding of the divergent roles of this small gene family is still far from complete.
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Published date: August 2002
Keywords:
biliverdin, chloroplasts, light and plastid signalling, photoreceptor, tetrapyrroles
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Local EPrints ID: 55923
URI: http://eprints.soton.ac.uk/id/eprint/55923
ISSN: 0300-5127
PURE UUID: af62197d-f567-4233-b09f-d6500e0bfd02
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Date deposited: 06 Aug 2008
Last modified: 09 Jan 2022 02:50
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Author:
P.J. Linley
Author:
T. Kohchi
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