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Inactivation of phytochrome- and phycobiliprotein-chromophore precursors by rat liver biliverdin reductase

Inactivation of phytochrome- and phycobiliprotein-chromophore precursors by rat liver biliverdin reductase
Inactivation of phytochrome- and phycobiliprotein-chromophore precursors by rat liver biliverdin reductase
The phytochrome chromophore precursor, 3E-phytochromobilin, and the phycobiliprotein chromophore precursors, 3E-phycocyanobilin and 3E-phycoerythrobilin, are enzymatically converted to novel rubinoid products by purified rat liver biliverdin reductase. Phytochromobilin and phycocyanobilin are particularly good substrates for biliverdin reductase with Km and Vmax values very similar to those of the natural substrate, biliverdin IX alpha. Phycoerythrobilin is the least preferred of the three bilin substrates. 1H NMR spectroscopy of phycocyanorubin, the product of phycocyanobilin catalysis by biliverdin reductase, and comparison of absorption spectra of all three rubinoid products reveal that the C10 methine bridge is selectively reduced by biliverdin reductase without altering the A-ring ethylidene substituent. In vitro phytochrome assembly experiments demonstrate that the phytorubin products do not form photoactive adducts with recombinant apophytochrome. These results suggest that ectopic expression of biliverdin reductase in plants will prevent assembly of the functional photoreceptor and thus will potentially alter light-mediated plant growth and development.
0021-9258
26099-106
Terry, M.J.
a8c2cd6b-8d35-4053-8d77-3841c2427c3b
Maines, M.D.
2d63e830-57df-48be-b116-af85a94c4931
Lagarias, J.C.
adfeba99-ddf0-46f1-bde8-2baad0d11489
Terry, M.J.
a8c2cd6b-8d35-4053-8d77-3841c2427c3b
Maines, M.D.
2d63e830-57df-48be-b116-af85a94c4931
Lagarias, J.C.
adfeba99-ddf0-46f1-bde8-2baad0d11489

Terry, M.J., Maines, M.D. and Lagarias, J.C. (1993) Inactivation of phytochrome- and phycobiliprotein-chromophore precursors by rat liver biliverdin reductase. The Journal of Biological Chemistry, 268 (35), 26099-106. (PMID:8253726)

Record type: Article

Abstract

The phytochrome chromophore precursor, 3E-phytochromobilin, and the phycobiliprotein chromophore precursors, 3E-phycocyanobilin and 3E-phycoerythrobilin, are enzymatically converted to novel rubinoid products by purified rat liver biliverdin reductase. Phytochromobilin and phycocyanobilin are particularly good substrates for biliverdin reductase with Km and Vmax values very similar to those of the natural substrate, biliverdin IX alpha. Phycoerythrobilin is the least preferred of the three bilin substrates. 1H NMR spectroscopy of phycocyanorubin, the product of phycocyanobilin catalysis by biliverdin reductase, and comparison of absorption spectra of all three rubinoid products reveal that the C10 methine bridge is selectively reduced by biliverdin reductase without altering the A-ring ethylidene substituent. In vitro phytochrome assembly experiments demonstrate that the phytorubin products do not form photoactive adducts with recombinant apophytochrome. These results suggest that ectopic expression of biliverdin reductase in plants will prevent assembly of the functional photoreceptor and thus will potentially alter light-mediated plant growth and development.

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Published date: 15 December 1993

Identifiers

Local EPrints ID: 182707
URI: https://eprints.soton.ac.uk/id/eprint/182707
ISSN: 0021-9258
PURE UUID: 418081e9-f381-471c-9831-60478af99b3f
ORCID for M.J. Terry: ORCID iD orcid.org/0000-0001-5002-2708

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Date deposited: 12 May 2011 10:49
Last modified: 09 Nov 2018 01:35

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