A megacomplex composed of both photosystem reaction centres in higher plants

Throughout the history of oxygen evolution, two types of photosystem reaction centres (PSI and PSII) have worked in a coordinated manner. The oxygen evolving centre is an integral part of PSII, and extracts an electron from water. PSI accepts the electron, and accumulates reducing power. Traditional...

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Bibliographic Details
Published in:Nature communications 2015-03, Vol.6 (1), p.6675-6675, Article 6675
Main Authors: Yokono, M., Takabayashi, A., Akimoto, S., Tanaka, A.
Format: Article
Language:English
Subjects:
140/125
631/1647/334/2244/710
631/449/1734
631/57
82/1
82/29
82/58
Arabidopsis
Arabidopsis Proteins - physiology
Electron Transport
Energy Transfer
Humanities and Social Sciences
Light
multidisciplinary
Oxygen - metabolism
Photosystem I Protein Complex - physiology
Photosystem II Protein Complex - physiology
Science
Science (multidisciplinary)
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Summary:Throughout the history of oxygen evolution, two types of photosystem reaction centres (PSI and PSII) have worked in a coordinated manner. The oxygen evolving centre is an integral part of PSII, and extracts an electron from water. PSI accepts the electron, and accumulates reducing power. Traditionally, PSI and PSII are thought to be spatially dispersed. Here, we show that about half of PSIIs are physically connected to PSIs in Arabidopsis thaliana . In the PSI–PSII complex, excitation energy is transferred efficiently between the two closely interacting reaction centres. PSII diverts excitation energy to PSI when PSII becomes closed-state in the PSI–PSII complex. The formation of PSI–PSII complexes is regulated by light conditions. Quenching of excess energy by PSI might be one of the physiological functions of PSI–PSII complexes. Plants have two types of photosystem reaction centres, PSI and PSII, that are traditionally thought to be spatially separate. Here, Yokono et al . show in Arabidopsis that around half of PSII physically interacts with PSI to efficiently transfer excitation energy between the complexes, and this interaction is regulated by light.
ISSN:2041-1723
2041-1723
DOI:10.1038/ncomms7675