- EMDB-24821: Structure of photosystem I with bound ferredoxin from Synechococc... -
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基本情報
登録情報
データベース: EMDB / ID: EMD-24821
タイトル
Structure of photosystem I with bound ferredoxin from Synechococcus sp. PCC 7335 acclimated to far-red light
マップデータ
Sharpened map for Far-red light-acclimated PSI from Synechococcus sp. PCC 7335
試料
複合体: Far-red light-acclimated Photosystem I from Synechococcus sp. PCC 7335
タンパク質・ペプチド: x 12種
リガンド: x 13種
キーワード
Photosystem I / Far-red light photoacclimation / Chlorophyll f / Ferredoxin / PsaF / PsaJ / PHOTOSYNTHESIS
機能・相同性
機能・相同性情報
photosystem I reaction center / photosystem I / photosystem I / chlorophyll binding / plasma membrane-derived thylakoid membrane / photosynthesis / endomembrane system / electron transport chain / 2 iron, 2 sulfur cluster binding / 4 iron, 4 sulfur cluster binding ...photosystem I reaction center / photosystem I / photosystem I / chlorophyll binding / plasma membrane-derived thylakoid membrane / photosynthesis / endomembrane system / electron transport chain / 2 iron, 2 sulfur cluster binding / 4 iron, 4 sulfur cluster binding / electron transfer activity / oxidoreductase activity / magnesium ion binding / metal ion binding 類似検索 - 分子機能
Photosystem I reaction center subunit PsaK / Photosystem I reaction centre subunit PsaK / Ferredoxin [2Fe-2S], plant / Photosystem I reaction centre subunit PsaK superfamily / Photosystem I reaction center subunit V/PsaK / Photosystem I psaG / psaK / Photosystem I PsaL, reaction centre subunit XI / Photosystem I, reaction centre subunit XI / Photosystem I PsaL, reaction centre subunit XI superfamily / Photosystem I reaction centre subunit XI ...Photosystem I reaction center subunit PsaK / Photosystem I reaction centre subunit PsaK / Ferredoxin [2Fe-2S], plant / Photosystem I reaction centre subunit PsaK superfamily / Photosystem I reaction center subunit V/PsaK / Photosystem I psaG / psaK / Photosystem I PsaL, reaction centre subunit XI / Photosystem I, reaction centre subunit XI / Photosystem I PsaL, reaction centre subunit XI superfamily / Photosystem I reaction centre subunit XI / Photosystem I reaction centre subunit VIII superfamily / Photosystem I PsaF, reaction centre subunit III / Photosystem I PsaF, reaction centre subunit III superfamily / Photosystem I reaction centre subunit III / Photosystem I PsaD / Photosystem I, reaction centre subunit PsaD superfamily / PsaD / Photosystem I PsaE, reaction centre subunit IV / Photosystem I PsaJ, reaction centre subunit IX superfamily / Photosystem I reaction centre subunit IV / PsaE / Photosystem I PsaJ, reaction centre subunit IX / Photosystem I reaction centre subunit IX / PsaJ / Photosystem I PsaB / Photosystem I PsaA / Photosystem I PsaA/PsaB, conserved site / Photosystem I psaA and psaB proteins signature. / Photosystem I PsaA/PsaB / Photosystem I PsaA/PsaB superfamily / Photosystem I psaA/psaB protein / 2Fe-2S ferredoxin, iron-sulphur binding site / 2Fe-2S ferredoxin-type iron-sulfur binding region signature. / Electron transport accessory-like domain superfamily / 2Fe-2S iron-sulfur cluster binding domain / Beta-grasp domain superfamily / 2Fe-2S ferredoxin-type iron-sulfur binding domain profile. / 2Fe-2S ferredoxin-type iron-sulfur binding domain / 2Fe-2S ferredoxin-like superfamily 類似検索 - ドメイン・相同性
Photosystem I reaction center subunit II / Ferredoxin-1 / Photosystem I reaction center subunit PsaK / Photosystem I P700 chlorophyll a apoprotein A1 / Photosystem I P700 chlorophyll a apoprotein A2 / Photosystem I reaction center subunit XI / Photosystem I reaction center subunit VIII / Photosystem I reaction center subunit III / Photosystem I reaction center subunit IX / Photosystem I reaction center subunit IV 類似検索 - 構成要素
ジャーナル: J Biol Chem / 年: 2022 タイトル: Structure of a photosystem I-ferredoxin complex from a marine cyanobacterium provides insights into far-red light photoacclimation. 著者: Christopher J Gisriel / David A Flesher / Gaozhong Shen / Jimin Wang / Ming-Yang Ho / Gary W Brudvig / Donald A Bryant / 要旨: Far-red light photoacclimation exhibited by some cyanobacteria allows these organisms to use the far-red region of the solar spectrum (700-800 nm) for photosynthesis. Part of this process includes ...Far-red light photoacclimation exhibited by some cyanobacteria allows these organisms to use the far-red region of the solar spectrum (700-800 nm) for photosynthesis. Part of this process includes the replacement of six photosystem I (PSI) subunits with isoforms that confer the binding of chlorophyll (Chl) f molecules that absorb far-red light (FRL). However, the exact sites at which Chl f molecules are bound are still challenging to determine. To aid in the identification of Chl f-binding sites, we solved the cryo-EM structure of PSI from far-red light-acclimated cells of the cyanobacterium Synechococcus sp. PCC 7335. We identified six sites that bind Chl f with high specificity and three additional sites that are likely to bind Chl f at lower specificity. All of these binding sites are in the core-antenna regions of PSI, and Chl f was not observed among the electron transfer cofactors. This structural analysis also reveals both conserved and nonconserved Chl f-binding sites, the latter of which exemplify the diversity in FRL-PSI among species. We found that the FRL-PSI structure also contains a bound soluble ferredoxin, PetF1, at low occupancy, which suggests that ferredoxin binds less transiently than expected according to the canonical view of ferredoxin-binding to facilitate electron transfer. We suggest that this may result from structural changes in FRL-PSI that occur specifically during FRL photoacclimation.