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Structural determination of the large photosystem II–light-harvesting complex II supercomplex of Chlamydomonas reinhardtii using nonionic amphipol
| Content Provider | Scilit |
|---|---|
| Author | Burton-Smith, Raymond N. Watanabe, Akimasa Tokutsu, Ryutaro Song, Chihong Murata, Kazuyoshi Minagawa, Jun |
| Copyright Year | 2019 |
| Description | Journal: Journal of Biological Chemistry 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 Chlamydomonas reinhardtii 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 C. reinhardtii PSII–LHCII supercomplex containing six LHCII trimers $(C_{2}S_{2}M_{2}L_{2}$). 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 $C_{2}S_{2}M_{1}L_{1}$ 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. |
| Related Links | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6791313/pdf http://www.jbc.org/content/294/41/15003.full.pdf |
| Ending Page | 15013 |
| Page Count | 11 |
| Starting Page | 15003 |
| ISSN | 00219258 |
| e-ISSN | 1083351X |
| DOI | 10.1074/jbc.ra119.009341 |
| Journal | Journal of Biological Chemistry |
| Issue Number | 41 |
| Volume Number | 294 |
| Language | English |
| Publisher | Elsevier BV |
| Publisher Date | 2019-10-01 |
| Access Restriction | Open |
| Subject Keyword | Journal: Journal of Biological Chemistry Biochemistry and Molecular Biology Chlamydomonas Reinhardtii Cryo-electron Microscopy Light-harvesting Complex (antenna Complex) Single-particle Analysis |
| Content Type | Text |
| Resource Type | Article |
| Subject | Cell Biology Biochemistry Molecular Biology |
