Excitation energy transfer between Light-harvesting complex II and Photosystem I in reconstituted membranes

Biochimica Et Biophysica Acta
Parveen AkhtarPetar H Lambrev

Abstract

Light-harvesting complex II (LHCII), the major peripheral antenna of Photosystem II in plants, participates in several concerted mechanisms for regulation of the excitation energy and electron fluxes in thylakoid membranes. In part, these include interaction of LHCII with Photosystem I (PSI) enhancing the latter's absorption cross-section - for example in the well-known state 1 - state 2 transitions or as a long-term acclimation to high light. In this work we examined the capability of LHCII to deliver excitations to PSI in reconstituted membranes in vitro. Proteoliposomes with native plant thylakoid membrane lipids and different stoichiometric ratios of LHCII:PSI were reconstituted and studied by steady-state and time-resolved fluorescence spectroscopy. Fluorescence emission from LHCII was strongly decreased in PSI-LHCII membranes due to trapping of excitations by PSI. Kinetic modelling of the time-resolved fluorescence data revealed the existence of separate pools of LHCII distinguished by the time scale of energy transfer. A strongly coupled pool, equivalent to one LHCII trimer per PSI, transferred excitations to PSI with near-unity efficiency on a time scale of less than 10ps but extra LHCIIs also contributed significantly ...Continue Reading

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Citations

Mar 21, 2017·Physical Chemistry Chemical Physics : PCCP·Stefano SantabarbaraStefano Caffarri
Oct 5, 2017·Photosynthesis Research·Eliezer M SchwarzJohn E Froehlich
Aug 24, 2017·Journal of Experimental Botany·Fiona Wanjiku MoejesOliver Ebenhöh
Oct 28, 2019·The Biochemical Journal·Petar H Lambrev, Parveen Akhtar
Jul 17, 2020·Frontiers in Plant Science·Mónika LingvayPetar H Lambrev
Jun 24, 2020·Nature Plants·Volha U ChukhutsinaRoberta Croce
Feb 27, 2017·Biochimica Et Biophysica Acta. Bioenergetics·Inge BosEmilie Wientjes
Nov 2, 2018·Langmuir : the ACS Journal of Surfaces and Colloids·Marijonas TutkusLeonas Valkunas
Jan 4, 2019·The Journal of Physical Chemistry. B·Parveen AkhtarPetar H Lambrev

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