Report

Structure of the maize photosystem I supercomplex with light-harvesting complexes I and II

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Science  08 Jun 2018:
Vol. 360, Issue 6393, pp. 1109-1113
DOI: 10.1126/science.aat1156

Antenna switches partners in the shade

A cloudy day or an overshadowing tree causes fluctuations in light that can throw off the balance of energy flow in plant photosystems I and II (PSI and PSII). Pan et al. solved structures of PSI bound to two light-harvesting complexes (LHCs). One LHC is permanently associated with PSI. The other LHC delivers light energy to PSII under optimal conditions but can switch to a PSI-associated state after phosphorylation by a kinase that senses the redox environment of the chloroplast. The movement of LHCs between the photosystems helps maintain even energy flux. Two chlorophyll-containing subunits are visible in the structure that connect the PSI core to each LHC.

Science, this issue p. 1109