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Computational evidence in favor of a protonated chromophore in the photoactivation of phytochrome
Uppsala University, Sweden and University of Sydney, Australia.
Uppsala University, Sweden.
Örebro University, Sweden.
2005 (English)In: Chemical Physics Letters, ISSN 0009-2614, E-ISSN 1873-4448, Vol. 416, no 1-3, 83-88 p.Article in journal (Refereed) Published
Abstract [en]

The photoactivation of the plant photoreceptor phytochrome is governed by a red-light-induced C15-Z  C15-E isomerization of the tetrapyrrolic chromophore phytochromobilin. From the viewpoint of experimental studies, ambiguity prevails as to whether the photoactivation involves a proton transfer from the chromophore to the surrounding protein. Here, we report a theoretical study addressing the effect of phytochromobilin protonation state on its photoisomerization by means of quantum chemical calculations. It is found that neutral forms of the chromophore are much less likely to photoisomerize than the parent, protonated form − a finding which supports the view that phytochromobilin remains protonated during phytochrome photoactivation.

Place, publisher, year, edition, pages
Elsevier, 2005. Vol. 416, no 1-3, 83-88 p.
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:liu:diva-96776DOI: 10.1016/j.cplett.2005.09.050OAI: oai:DiVA.org:liu-96776DiVA: diva2:643323
Available from: 2013-08-27 Created: 2013-08-27 Last updated: 2017-12-06Bibliographically approved

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Durbeej, Bo

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