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'''Unreleased structure'''


The entry 6kmw is ON HOLD
==Structure of PSI from H. hongdechloris grown under white light condition==
<SX load='6kmw' size='340' side='right' viewer='molstar' caption='[[6kmw]], [[Resolution|resolution]] 2.35&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[6kmw]] is a 24 chain structure with sequence from [https://en.wikipedia.org/wiki/Halomicronema_hongdechloris_C2206 Halomicronema hongdechloris C2206]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6KMW OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=6KMW 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]] 2.35&#8491;</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=CA:CALCIUM+ION'>CA</scene>, <scene name='pdbligand=CLA:CHLOROPHYLL+A'>CLA</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=PQN:PHYLLOQUINONE'>PQN</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=6kmw FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6kmw OCA], [https://pdbe.org/6kmw PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=6kmw RCSB], [https://www.ebi.ac.uk/pdbsum/6kmw PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=6kmw ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/A0A1Z3HPE3_9CYAN A0A1Z3HPE3_9CYAN] Apoprotein for the two 4Fe-4S centers FA and FB of photosystem I (PSI); essential for photochemical activity. FB is the terminal electron acceptor of PSI, donating electrons to ferredoxin. The C-terminus interacts with PsaA/B/D and helps assemble the protein into the PSI complex. Required for binding of PsaD and PsaE to PSI. PSI is a plastocyanin/cytochrome c6-ferredoxin oxidoreductase, converting photonic excitation into a charge separation, which transfers an electron from the donor P700 chlorophyll pair to the spectroscopically characterized acceptors A0, A1, FX, FA and FB in turn.[HAMAP-Rule:MF_01303]
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Chlorophylls (Chl) play pivotal roles in energy capture, transfer and charge separation in photosynthesis. Among Chls functioning in oxygenic photosynthesis, Chl f is the most red-shifted type first found in a cyanobacterium Halomicronema hongdechloris. The location and function of Chl f in photosystems are not clear. Here we analyzed the high-resolution structures of photosystem I (PSI) core from H. hongdechloris grown under white or far-red light by cryo-electron microscopy. The structure showed that, far-red PSI binds 83 Chl a and 7 Chl f, and Chl f are associated at the periphery of PSI but not in the electron transfer chain. The appearance of Chl f is well correlated with the expression of PSI genes induced under far-red light. These results indicate that Chl f functions to harvest the far-red light and enhance uphill energy transfer, and changes in the gene sequences are essential for the binding of Chl f.


Authors:  
Structural basis for the adaptation and function of chlorophyll f in photosystem I.,Kato K, Shinoda T, Nagao R, Akimoto S, Suzuki T, Dohmae N, Chen M, Allakhverdiev SI, Shen JR, Akita F, Miyazaki N, Tomo T Nat Commun. 2020 Jan 13;11(1):238. doi: 10.1038/s41467-019-13898-5. PMID:31932639<ref>PMID:31932639</ref>


Description:  
From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
[[Category: Unreleased Structures]]
</div>
<div class="pdbe-citations 6kmw" style="background-color:#fffaf0;"></div>
 
==See Also==
*[[Photosystem I 3D structures|Photosystem I 3D structures]]
== References ==
<references/>
__TOC__
</SX>
[[Category: Halomicronema hongdechloris C2206]]
[[Category: Large Structures]]
[[Category: Akita F]]
[[Category: Kato K]]
[[Category: Miyazaki N]]
[[Category: Nagao R]]
[[Category: Shen JR]]
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