NDLI: Too much light? How β-carotene protects the photosystem II reaction centre

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Quality control of Photosystem II: an FtsH protease plays an essential role in the turnover of the reaction center D1 protein in Synechocystis PCC 6803 under heat stress as well as light stress conditions

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Excitation energy transfer from phycobiliprotein to chlorophyll d in intact cells of Acaryochloris marina studied by time- and wavelength-resolved fluorescence spectroscopy

The assembly and organisation of photosynthetic membranes in Rhodobacter sphaeroides

Isolation and characterization of a xanthophyll-rich fraction from the thylakoid membrane of Dunaliella salina(green algae)

The mechanism for dioxygen formation in PSII studied by quantum chemical methods

A role of the C-terminal extension of the photosystem II D1 protein in sensitivity of the cyanobacterium Synechocystis PCC 6803 to photoinhibition

The role of D1-Ala344 in charge stabilization and recombination in Photosystem II

Kinetic characterisation of the light-driven protochlorophyllide oxidoreductase (POR) from Thermosynechococcus elongatus

The nature of the photosystem II reaction centre in the chlorophyll d-containing prokaryote, Acaryochloris marina

Degradation of the main Photosystem II light-harvesting complex

Functional flexibility and acclimation of the thylakoid membrane

Granal stacking of thylakoid membranes in higher plant chloroplasts: the physicochemical forces at work and the functional consequences that ensue

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Back cover

Photochemical & Photobiological Sciences Vol - 4 Issue - 9

Photochemical & Photobiological Sciences Vol - 4 Issue - 8

Photochemical & Photobiological Sciences Vol - 4 Issue - 7

Photochemical & Photobiological Sciences Vol - 4 Issue - 6

Photochemical & Photobiological Sciences Vol - 4 Issue - 5

Photochemical & Photobiological Sciences Vol - 4 Issue - 4

Photochemical & Photobiological Sciences Vol - 4 Issue - 3

Photochemical & Photobiological Sciences Vol - 4 Issue - 2

Photochemical & Photobiological Sciences Vol -3

Photochemical & Photobiological Sciences Vol -2

Too much light? How β-carotene protects the photosystem II reaction centre

Content Provider	Royal Society of Chemistry (RSC)
Author	Telfer, Alison
Copyright Year	2005
Abstract	The photosystem II reaction centre of all oxygenic organisms is subject to photodamage by high light i.e. photoinhibition. In this review I discuss the reasons for the inevitable and unpreventable oxidative damage that occurs in photosystem II and the way in which β-carotene bound to the reaction centre significantly mitigates this damage. Recent X-ray structures of the photosystem II core complex (reaction centre plus the inner antenna complexes) have revealed the binding sites of some of the carotenoids known to be bound to the complex. In the light of these X-ray structures and their known biophysical properties it is thus possible to identify the two β-carotenes present in the photosystem II reaction centre. The two carotenes are both bound to the D2 protein and this positioning is discussed in relation to their ability to act as quenchers of singlet oxygen, generated via the triplet state of the primary electron donor. It is proposed that their location on the D2 polypeptide means there is more oxidative damage to the D1 protein and that this underlies the fact that this latter protein is continuously re-synthesised, at a far greater rate than any other protein involved in photosynthesis. The relevance of a cycle of electrons around photosystem II, via cytochrome b559, in order to re-reduce the β-carotenes when they are oxidised and hence restore their ability to quench singlet oxygen, is also discussed.
Starting Page	950
Ending Page	956
Page Count	7
File Format	HTM / HTML PDF
ISSN	1474905X
Volume Number	4
Issue Number	12
Journal	Photochemical & Photobiological Sciences
DOI	10.1039/b507888c
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Subscribed
Subject Keyword	Photosynthetic reaction centre Beta-Carotene X-ray crystallography Singlet oxygen Redox Photosystem II Photosynthesis Peptide Protein
Content Type	Text
Resource Type	Article
Subject	Physical and Theoretical Chemistry

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Singlet oxygen production in photosynthesis (2004)

Conformational changes and their role in non-radiative energy dissipation in photosystem II reaction centres

The nature of the photosystem II reaction centre in the chlorophyll d-containing prokaryote, Acaryochloris marina

Detection of the D₀→D₁ transition of β-carotene radical cation photoinduced in photosystem II

The mechanism of photosynthetic water splitting

A redox switch hypothesi in.

X-ray spectroscopy of the photosynthetic oxygen-evolving complex

Singlet oxygen production in photosynthesis

Photophysical properties of quinones and their interaction with the photosynthetic reaction centre

Too much light? How β-carotene protects the photosystem II reaction centre

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