Lhcx proteins provide photoprotection via thermal dissipation of absorbed light in the diatom Phaeodactylum tricornutum

Jochen M. Buck, Jonathan Sherman, Carolina Río Bártulos, Manuel Serif, Marc Halder, Jan Henkel, Angela Falciatore, Johann Lavaud, Maxim Y. Gorbunov, Peter G. Kroth, Paul G. Falkowski and Bernard Lepetit ()
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Jochen M. Buck: University of Konstanz
Jonathan Sherman: The State University of New Jersey
Carolina Río Bártulos: University of Konstanz
Manuel Serif: University of Konstanz
Marc Halder: University of Konstanz
Jan Henkel: University of Konstanz
Angela Falciatore: Laboratory of Computational and Quantitative Biology
Johann Lavaud: Université Laval
Maxim Y. Gorbunov: The State University of New Jersey
Peter G. Kroth: University of Konstanz
Paul G. Falkowski: The State University of New Jersey
Bernard Lepetit: University of Konstanz

Nature Communications, 2019, vol. 10, issue 1, 1-12

Abstract: Abstract Diatoms possess an impressive capacity for rapidly inducible thermal dissipation of excess absorbed energy (qE), provided by the xanthophyll diatoxanthin and Lhcx proteins. By knocking out the Lhcx1 and Lhcx2 genes individually in Phaeodactylum tricornutum strain 4 and complementing the knockout lines with different Lhcx proteins, multiple mutants with varying qE capacities are obtained, ranging from zero to high values. We demonstrate that qE is entirely dependent on the concerted action of diatoxanthin and Lhcx proteins, with Lhcx1, Lhcx2 and Lhcx3 having similar functions. Moreover, we establish a clear link between Lhcx1/2/3 mediated inducible thermal energy dissipation and a reduction in the functional absorption cross-section of photosystem II. This regulation of the functional absorption cross-section can be tuned by altered Lhcx protein expression in response to environmental conditions. Our results provide a holistic understanding of the rapidly inducible thermal energy dissipation process and its mechanistic implications in diatoms.

Date: 2019
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DOI: 10.1038/s41467-019-12043-6

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