Abstract:
:Symbiodiniaceae are symbiotic dinoflagellates that provide photosynthetic products to corals. Because corals are distributed across a wide range of depths in the ocean, Symbiodiniaceae species must adapt to various light environments to optimize their photosynthetic performance. However, as few biochemical studies of Symbiodiniaceae photosystems have been reported, the molecular mechanisms of photoadaptation in this algal family remain poorly understood. Here, to investigate the photosynthetic machineries in Symbiodiniaceae, we purified and characterized the PSI supercomplex from the genome-sequenced Breviolum minutum (formerly Symbiodinium minutum). Mass spectrometry analysis revealed 25 light-harvesting complexes (LHCs), including both LHCF and LHCR families, from the purified PSI-LHC supercomplex. Single-particle electron microscopy showed unique giant supercomplex structures of PSI that were associated with the LHCs. Moreover, the PSI-LHC supercomplex contained a significant amount of the xanthophyll cycle pigment diadinoxanthin. Upon high light treatment, B. minutum cells showed increased nonphotochemical quenching, which was correlated with the conversion of diadinoxanthin to diatoxanthin, occurring preferentially in the PSI-LHC supercomplex. The possible role of PSI-LHC in photoprotection in Symbiodiniaceae is discussed.
journal_name
Plant Physioljournal_title
Plant physiologyauthors
Kato H,Tokutsu R,Kubota-Kawai H,Burton-Smith RN,Kim E,Minagawa Jdoi
10.1104/pp.20.00726subject
Has Abstractpub_date
2020-08-01 00:00:00pages
1725-1734issue
4eissn
0032-0889issn
1532-2548pii
pp.20.00726journal_volume
183pub_type
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