Ministry of Education, Culture, Sports, Science and Technology (Japan)
17K19431
日本
Ministry of Education, Culture, Sports, Science and Technology (Japan)
19H03187
日本
Japan Agency for Medical Research and Development (AMED)
JP20am0101071
日本
引用
ジャーナル: Nat Commun / 年: 2023 タイトル: Uphill energy transfer mechanism for photosynthesis in an Antarctic alga. 著者: Makiko Kosugi / Masato Kawasaki / Yutaka Shibata / Kojiro Hara / Shinichi Takaichi / Toshio Moriya / Naruhiko Adachi / Yasuhiro Kamei / Yasuhiro Kashino / Sakae Kudoh / Hiroyuki Koike / Toshiya Senda / 要旨: Prasiola crispa, an aerial green alga, forms layered colonies under the severe terrestrial conditions of Antarctica. Since only far-red light is available at a deep layer of the colony, P. crispa has ...Prasiola crispa, an aerial green alga, forms layered colonies under the severe terrestrial conditions of Antarctica. Since only far-red light is available at a deep layer of the colony, P. crispa has evolved a molecular system for photosystem II (PSII) excitation using far-red light with uphill energy transfer. However, the molecular basis underlying this system remains elusive. Here, we purified a light-harvesting chlorophyll (Chl)-binding protein complex from P. crispa (Pc-frLHC) that excites PSII with far-red light and revealed its ring-shaped structure with undecameric 11-fold symmetry at 3.13 Å resolution. The primary structure suggests that Pc-frLHC evolved from LHCI rather than LHCII. The circular arrangement of the Pc-frLHC subunits is unique among eukaryote LHCs and forms unprecedented Chl pentamers at every subunit‒subunit interface near the excitation energy exit sites. The Chl pentamers probably contribute to far-red light absorption. Pc-frLHC's unique Chl arrangement likely promotes PSII excitation with entropy-driven uphill excitation energy transfer.
モデルのタイプ: OTHER 詳細: An ab initio model was generated using RELION3's own implementation of Stochastic Gradient Descent (SGD) algorithm and low-pass filtered to 60 A for use as an initial model for 3D classification.
最終 再構成
使用したクラス数: 1 / アルゴリズム: FOURIER SPACE / 解像度のタイプ: BY AUTHOR / 解像度: 3.13 Å / 解像度の算出法: FSC 0.143 CUT-OFF / ソフトウェア - 名称: RELION (ver. 3.1) / 使用した粒子像数: 99510
初期 角度割当
タイプ: MAXIMUM LIKELIHOOD / ソフトウェア - 名称: RELION (ver. 3.1)
最終 角度割当
タイプ: MAXIMUM LIKELIHOOD / ソフトウェア - 名称: RELION (ver. 3.1)