9s1m: Difference between revisions
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==Cryo-EM structure of Posidonia oceanica L-PSI-LHCI-LHCII supercomplex== | |||
<StructureSection load='9s1m' size='340' side='right'caption='[[9s1m]], [[Resolution|resolution]] 3.31Å' scene=''> | |||
== Structural highlights == | |||
<table><tr><td colspan='2'>[[9s1m]] is a 13 chain structure with sequence from [https://en.wikipedia.org/wiki/Posidonia_oceanica Posidonia oceanica]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=9S1M OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=9S1M FirstGlance]. <br> | |||
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">Electron Microscopy, [[Resolution|Resolution]] 3.31Å</td></tr> | |||
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=BCR:BETA-CAROTENE'>BCR</scene>, <scene name='pdbligand=CLA:CHLOROPHYLL+A'>CLA</scene>, <scene name='pdbligand=DGD:DIGALACTOSYL+DIACYL+GLYCEROL+(DGDG)'>DGD</scene>, <scene name='pdbligand=LHG:1,2-DIPALMITOYL-PHOSPHATIDYL-GLYCEROLE'>LHG</scene>, <scene name='pdbligand=LMG:1,2-DISTEAROYL-MONOGALACTOSYL-DIGLYCERIDE'>LMG</scene>, <scene name='pdbligand=LMT:DODECYL-BETA-D-MALTOSIDE'>LMT</scene>, <scene name='pdbligand=LUT:(3R,3R,6S)-4,5-DIDEHYDRO-5,6-DIHYDRO-BETA,BETA-CAROTENE-3,3-DIOL'>LUT</scene>, <scene name='pdbligand=NEX:(3S,3S,5R,5R,6R,6S,8R,9cis)-6,7-didehydro-5,5,6,6-tetrahydro-5,6-epoxy-beta,beta-carotene-3,3,5-triol'>NEX</scene>, <scene name='pdbligand=PQN:PHYLLOQUINONE'>PQN</scene>, <scene name='pdbligand=TPO:PHOSPHOTHREONINE'>TPO</scene>, <scene name='pdbligand=XAT:(3S,5R,6S,3S,5R,6S)-5,6,5,6-DIEPOXY-5,6,5,6-+TETRAHYDRO-BETA,BETA-CAROTENE-3,3-DIOL'>XAT</scene></td></tr> | |||
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=9s1m FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=9s1m OCA], [https://pdbe.org/9s1m PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=9s1m RCSB], [https://www.ebi.ac.uk/pdbsum/9s1m PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=9s1m ProSAT]</span></td></tr> | |||
</table> | |||
<div style="background-color:#fffaf0;"> | |||
== Publication Abstract from PubMed == | |||
Seagrasses are marine angiosperms re-adapted to underwater life, forming productive ecosystems and long-term carbon sinks. Posidonia oceanica thrives up to 50 m depth, where light is scarce and spectrally shifted; yet, the molecular basis of its photosynthetic adaptation remains unclear. Here, we report that P. oceanica genetically adapts for highly efficient photon use under dim light by enhancing photosystem antenna size and reducing exciton trapping time. We determine the structures of P. oceanica PSI supercomplexes by cryo-electron microscopy, revealing an expanded antenna system composed of PSI-LHCI, a trimeric phospho-LHCII, and an additional LHCI heterodimer. Low-energy chlorophyll forms associated with LHCI are lost. Ultrafast spectroscopy shows that this loss correlates with faster exciton trapping, which compensates for antenna expansion and enhances light-use efficiency under dim light. We identify key residues responsible for the loss of low-energy forms. Reversion to land-plant ortholog sequences restores red-shifted emission, providing strategies to enhance light-use efficiency in crops. | |||
Structural and spectral adaptation of the seagrass Posidonia oceanica photosystem I to seabed light.,Amelii A, Capaldi S, Russo M, Guardini Z, Sanita G, Esposito E, Olive I, Maiuri M, Dall'Osto L, Cerullo G, Procaccini G, Bassi R Nat Commun. 2026 Jul 16;17(1):6135. doi: 10.1038/s41467-026-75200-8. PMID:42463682<ref>PMID:42463682</ref> | |||
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | |||
[[Category: | </div> | ||
[[Category: | <div class="pdbe-citations 9s1m" style="background-color:#fffaf0;"></div> | ||
[[Category: | == References == | ||
[[Category: Bassi | <references/> | ||
[[Category: Esposito | __TOC__ | ||
[[Category: | </StructureSection> | ||
[[Category: Large Structures]] | |||
[[Category: Posidonia oceanica]] | |||
[[Category: Amelii A]] | |||
[[Category: Bassi R]] | |||
[[Category: Capaldi S]] | |||
[[Category: Esposito M]] | |||
[[Category: Sanita G]] | |||
Revision as of 20:19, 29 July 2026
Cryo-EM structure of Posidonia oceanica L-PSI-LHCI-LHCII supercomplex
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