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-Structure paper
タイトル | The 2.4 Å cryo-EM structure of a heptameric light-harvesting 2 complex reveals two carotenoid energy transfer pathways. |
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ジャーナル・号・ページ | Sci Adv, Vol. 7, Issue 7, Year 2021 |
掲載日 | 2021年2月12日 |
![]() | Alastair T Gardiner / Katerina Naydenova / Pablo Castro-Hartmann / Tu C Nguyen-Phan / Christopher J Russo / Kasim Sader / C Neil Hunter / Richard J Cogdell / Pu Qian / ![]() ![]() |
PubMed 要旨 | We report the 2.4 Ångström resolution structure of the light-harvesting 2 (LH2) complex from () determined by cryogenic electron microscopy. The structure contains a heptameric ring that is ...We report the 2.4 Ångström resolution structure of the light-harvesting 2 (LH2) complex from () determined by cryogenic electron microscopy. The structure contains a heptameric ring that is unique among all known LH2 structures, explaining the unusual spectroscopic properties of this bacterial antenna complex. We identify two sets of distinct carotenoids in the structure and describe a network of energy transfer pathways from the carotenoids to bacteriochlorophyll molecules. The geometry imposed by the heptameric ring controls the resonant coupling of the long-wavelength energy absorption band. Together, these details reveal key aspects of the assembly and oligomeric form of purple bacterial LH2 complexes that were previously inaccessible by any technique. |
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手法 | EM (単粒子) |
解像度 | 2.38 Å |
構造データ | EMDB-11516, PDB-6zxa: |
化合物 | ![]() ChemComp-BCL: ![]() ChemComp-QS2: ![]() ChemComp-QSE: |
由来 |
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![]() | PHOTOSYNTHESIS / purple bacteria / light harvesting complex / Marichromatium purpuratum / okenone. |