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Photosynthesis Research

, Volume 84, Issue 1–3, pp 275–281 | Cite as

Requirements for different combinations of the extrinsic proteins in specific cyanobacterial Photosystem II mutants

  • Julian J. Eaton-Rye
Regular paper

Abstract

The crystallographic data available for Photosystem II (PS II) in cyanobacteria has now provided complete structures for loop E from CP43 and CP47 as well as the extrinsic subunits PsbO, PsbU and PsbV. Protein interactions between these subunits are essential for stable water splitting and there is evidence that the binding of PsbU facilitates optimal energy transfer from the phycobilisome. Interactions between PsbO and CP47 may also play a role in dimer stabilization while loop E of CP43 contributes directly to the water-splitting reaction. Recent evidence also suggests that homologs of PsbP and PsbQ play key roles in cyanobacterial PS II, and under nutrient-deficient conditions PsbQ appears essential for photoautotrophic growth.

Keywords

CP47 protein photosynthesis Photosystem II PsbO protein PsbQ protein PsbV protein PsbU protein 

Abbreviations

PBS

phycobilisome

Fo

dark-adapted fluorescence yield when Photosystem II traps are open

OEC

O2-evolving complex

PS I (II)

Photosystem I (II)

TyrD

redox active Tyr-160 of D2

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Copyright information

© Springer 2005

Authors and Affiliations

  1. 1.Department of BiochemistryUniversity of OtagoDunedinNew Zealand

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