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Constitution and energetics of photosystem I and photosystem II in the chlorophyll d-dominated cyanobacterium Acaryochloris marina ☆

Paper ID Volume ID Publish Year Pages File Format Full-Text
29640 44425 2011 8 PDF Available
Title
Constitution and energetics of photosystem I and photosystem II in the chlorophyll d-dominated cyanobacterium Acaryochloris marina ☆
Abstract

This mini review presents current topics of discussion about photosystem (PS) I and PS II of photosynthesis in the Acaryochloris marina. A. marina is a photosynthetic cyanobacterium in which chlorophyll (Chl) d is the major antenna pigment (>95%). However, Chl a is always present in a few percent. Chl d absorbs light with a wavelength up to 30 nm red-shifted from Chl a. Therefore, the chlorophyll species of the special pair in PS II has been a matter of debate because if Chl d was the special pair component, the overall energetics must be different in A. marina. The history of this field indicates that a purified sample is necessary for the reliable identification and characterization of the special pair. In view of the spectroscopic data and the redox potential of pheophytin, we discuss the nature of special pair constituents and the localization of the enigmatic Chl a.

► In this article, we report that the special pair of PS II is a Chl d homodimer in Acaryochloris marina. ► The redox potential of the special pair was retained in A. marina at the same level of other organisms. ► Overall energetics of A. marina provide more information on the general concept of photosynthesis.

Keywords
Acaryochloris; Chlorophyll d; Photosystem; Energetics; Redox potential; Reaction center
First Page Preview
Constitution and energetics of photosystem I and photosystem II in the chlorophyll d-dominated cyanobacterium Acaryochloris marina ☆
Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology B: Biology - Volume 104, Issues 1–2, July–August 2011, Pages 333–340
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering