Low pH-induced regulation of excitation energy between the two photosystems

Anjana Jajoo; Nageswara Rao Mekala; Teena Tongra; Arjun Tiwari; Michele Grieco; Mikko Tikkanen; Eva-Mari Aro

doi:10.1016/j.febslet.2014.01.056

Low pH-induced regulation of excitation energy between the two photosystems

FEBS Lett. 2014 Mar 18;588(6):970-4. doi: 10.1016/j.febslet.2014.01.056. Epub 2014 Feb 13.

Authors

Anjana Jajoo¹, Nageswara Rao Mekala², Teena Tongra³, Arjun Tiwari², Michele Grieco², Mikko Tikkanen², Eva-Mari Aro⁴

Affiliations

¹ School of Life Science, Devi Ahilya University, Indore, M.P., India. Electronic address: anjanajajoo@hotmail.com.
² Department of Biochemistry, Molecular Plant Biology, University of Turku, FI-20014 Turku, Finland.
³ School of Life Science, Devi Ahilya University, Indore, M.P., India.
⁴ Department of Biochemistry, Molecular Plant Biology, University of Turku, FI-20014 Turku, Finland. Electronic address: evaaro@utu.fi.

PMID: 24530686
DOI: 10.1016/j.febslet.2014.01.056

Abstract

Earlier studies have proposed that low pH causes state transitions in spinach thylakoid membranes. Several Arabidopsis mutants (stn7 incapable in phosphorylation of LHC II, stn8 incapable in phosphorylation of PSII core proteins, stn7 stn8 double mutant and npq4 lacking PsbS and hence qE) were used to investigate the mechanisms involved in low pH induced changes in the thylakoid membrane. We propose that protonation of PsbS at low pH is involved in enhancing energy spillover to PS I.

Keywords: Energy spillover; Low pH; Photosystem I; Photosystem II; PsbS.

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Arabidopsis / radiation effects*
Hydrogen-Ion Concentration
Photosystem I Protein Complex / chemistry*
Photosystem II Protein Complex / chemistry*
Plant Leaves / chemistry
Spectrometry, Fluorescence
Thylakoids / chemistry*
Thylakoids / radiation effects

Substances

Photosystem I Protein Complex
Photosystem II Protein Complex