How Paired PSII-LHCII Supercomplexes Mediate the Stacking of Plant Thylakoid Membranes Unveiled by Structural Mass-spectrometry

Overview

Journal Nat Commun

Specialty Biology

Date 2020 Mar 15

PMID 32170184

Citations 29

Authors

Pascal Albanese

Sem Tamara

Guido Saracco

Richard A Scheltema

Cristina Pagliano

Affiliations

Soon will be listed here.

Abstract

Grana are a characteristic feature of higher plants' thylakoid membranes, consisting of stacks of appressed membranes enriched in Photosystem II (PSII) and associated light-harvesting complex II (LHCII) proteins, together forming the PSII-LHCII supercomplex. Grana stacks undergo light-dependent structural changes, mainly by reorganizing the supramolecular structure of PSII-LHCII supercomplexes. LHCII is vital for grana formation, in which also PSII-LHCII supercomplexes are involved. By combining top-down and crosslinking mass spectrometry we uncover the spatial organization of paired PSII-LHCII supercomplexes within thylakoid membranes. The resulting model highlights a basic molecular mechanism whereby plants maintain grana stacking at changing light conditions. This mechanism relies on interactions between stroma-exposed N-terminal loops of LHCII trimers and Lhcb4 subunits facing each other in adjacent membranes. The combination of light-dependent LHCII N-terminal trimming and extensive N-terminal α-acetylation likely affects interactions between pairs of PSII-LHCII supercomplexes across the stromal gap, ultimately mediating membrane folding in grana stacks.

Citing Articles

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