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TitleStructural determination of the large photosystem II-light-harvesting complex II supercomplex of using nonionic amphipol.
Journal, issue, pagesJ Biol Chem, Vol. 294, Issue 41, Page 15003-15013, Year 2019
Publish dateOct 11, 2019
AuthorsRaymond N Burton-Smith / Akimasa Watanabe / Ryutaro Tokutsu / Chihong Song / Kazuyoshi Murata / Jun Minagawa /
PubMed AbstractIn photosynthetic organisms, photosystem II (PSII) is a large membrane protein complex, consisting of a pair of core complexes surrounded by an array of variable numbers of light-harvesting complex ...In photosynthetic organisms, photosystem II (PSII) is a large membrane protein complex, consisting of a pair of core complexes surrounded by an array of variable numbers of light-harvesting complex (LHC) II proteins. Previously reported structures of the PSII-LHCII supercomplex of the green alga exhibit significant structural heterogeneity, but recently improved purification methods employing ionic amphipol A8-35 have enhanced supercomplex stability, providing opportunities for determining a more intact structure. Herein, we present a 5.8 Å cryo-EM map of the PSII-LHCII supercomplex containing six LHCII trimers (CSML). Utilizing a newly developed nonionic amphipol-based purification and stabilizing method, we purified the largest photosynthetic supercomplex to the highest percentage of the intact configuration reported to date. We found that the interprotein distances within the light-harvesting complex array in the green algal photosystem are larger than those previously observed in higher plants, indicating that the potential route of energy transfer in the PSII-LHCII supercomplex in green algae may be altered. Interestingly, we also observed an asymmetric PSII-LHCII supercomplex structure comprising CSML in the same sample. Moreover, we found a new density adjacent to the PSII core complex, attributable to a single-transmembrane helix. It was previously unreported in the cryo-EM maps of PSII-LHCII supercomplexes from land plants.
External linksJ Biol Chem / PubMed:31420447 / PubMed Central
MethodsEM (single particle)
Resolution5.8 Å
Structure data

EMDB-9904:
Cryo-EM map of Chlamydomonas reinhardtii PSII-LHCII supercomplex at 5.8A resolution
Method: EM (single particle) / Resolution: 5.8 Å

Source
  • Chlamydomonas reinhardtii (plant)

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