Journal
FEBS LETTERS
Volume 582, Issue 10, Pages 1477-1482Publisher
WILEY
DOI: 10.1016/j.febslet.2008.03.040
Keywords
xanthophyll cycle; thylakoid membrane; non-photochemical quenching; light harvesting complex; lutein; Arabidopsis
Funding
- Biotechnology and Biological Sciences Research Council Funding Source: Medline
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Nonphotochemical quenching (NPQ) is the photoprotective dissipation of energy in photosynthetic membranes. The hypothesis that the Delta pH-dependent component of NPQ (qE) component of non-photochemical quenching is controlled allosterically by the xanthophyll cycle has been tested using Arabidopsis mutants with different xanthophyll content and composition of Lhcb proteins. The titration curves of qE against Delta pH were different in chloroplasts containing zeaxanthin or violaxanthin, proving their roles as allosteric activator and inhibitor, respectively. The curves differed in mutants deficient in lutein and specific Lhcb proteins. The results show that qE is determined by xanthophyll occupancy and the structural interactions within the antenna that govern allostericity. (C) 2008 Published by Elsevier B.V. on behalf of the Federation of European Biochemical Societies.
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