National Basic Research Program of China (973 Program)
2017YFA0504600
中国
National Basic Research Program of China (973 Program)
2016YFA0501902
中国
National Basic Research Program of China (973 Program)
31861143048
中国
National Basic Research Program of China (973 Program)
31722015
中国
引用
ジャーナル: Elife / 年: 2021 タイトル: In situ cryo-ET structure of phycobilisome-photosystem II supercomplex from red alga. 著者: Meijing Li / Jianfei Ma / Xueming Li / Sen-Fang Sui / 要旨: Phycobilisome (PBS) is the main light-harvesting antenna in cyanobacteria and red algae. How PBS transfers the light energy to photosystem II (PSII) remains to be elucidated. Here we report the in ...Phycobilisome (PBS) is the main light-harvesting antenna in cyanobacteria and red algae. How PBS transfers the light energy to photosystem II (PSII) remains to be elucidated. Here we report the in situ structure of the PBS-PSII supercomplex from UTEX 2757 using cryo-electron tomography and subtomogram averaging. Our work reveals the organized network of hemiellipsoidal PBS with PSII on the thylakoid membrane in the native cellular environment. In the PBS-PSII supercomplex, each PBS interacts with six PSII monomers, of which four directly bind to the PBS, and two bind indirectly. Additional three 'connector' proteins also contribute to the connections between PBS and PSIIs. Two PsbO subunits from adjacent PSII dimers bind with each other, which may promote stabilization of the PBS-PSII supercomplex. By analyzing the interaction interface between PBS and PSII, we reveal that α and ApcD connect with CP43 of PSII monomer and that α also interacts with CP47' of the neighboring PSII monomer, suggesting the multiple light energy delivery pathways. The in situ structures illustrate the coupling pattern of PBS and PSII and the arrangement of the PBS-PSII supercomplex on the thylakoid, providing the near-native 3D structural information of the various energy transfer from PBS to PSII.
A: 13122.956 Å / B: 12685.068 Å / C: 1245.244 Å α=β=γ: 90.0 °
CCP4マップ ヘッダ情報:
mode
Image stored as Reals
Å/pix. X/Y/Z
13.684
13.684
13.684
M x/y/z
959
927
91
origin x/y/z
0.000
0.000
0.000
length x/y/z
13122.956
12685.068
1245.244
α/β/γ
90.000
90.000
90.000
start NX/NY/NZ
53
54
55
NX/NY/NZ
134
138
134
MAP C/R/S
1
2
3
start NC/NR/NS
0
0
-281
NC/NR/NS
959
927
91
D min/max/mean
-0.385
0.810
0.227
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添付データ
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試料の構成要素
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全体 : phycobilisome-photosystem II supercomplex
全体
名称: phycobilisome-photosystem II supercomplex
要素
細胞: phycobilisome-photosystem II supercomplex
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超分子 #1: phycobilisome-photosystem II supercomplex
超分子
名称: phycobilisome-photosystem II supercomplex / タイプ: cell / ID: 1 / 親要素: 0 / 詳細: phycobilisome, photosystem II
由来(天然)
生物種: Porphyridium purpureum (真核生物)
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実験情報
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構造解析
手法
クライオ電子顕微鏡法
解析
電子線トモグラフィー法
試料の集合状態
cell
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試料調製
緩衝液
pH: 7
凍結
凍結剤: ETHANE
切片作成
集束イオンビーム - 装置: OTHER / 集束イオンビーム - イオン: OTHER / 集束イオンビーム - 電圧: 30 kV / 集束イオンビーム - 電流: 0.1 nA / 集束イオンビーム - 時間: 3600 sec. / 集束イオンビーム - 温度: 191 K / 集束イオンビーム - Initial thickness: 1000 nm / 集束イオンビーム - 最終 厚さ: 200 nm 集束イオンビーム - 詳細: The value given for _emd_sectioning_focused_ion_beam.instrument is FEI Quanta FIB. This is not in a list of allowed values {'DB235', 'OTHER'} so OTHER is written into the XML file.
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電子顕微鏡法
顕微鏡
FEI TITAN KRIOS
撮影
フィルム・検出器のモデル: GATAN K2 SUMMIT (4k x 4k) 平均電子線量: 120.0 e/Å2