View source for 3jbb


==Characterization of red-shifted phycobiliprotein complexes isolated from the chlorophyll f-containing cyanobacterium Halomicronema hongdechloris==
<SX load='3jbb' size='340' side='right' viewer='molstar' caption='[[3jbb]], [[Resolution|resolution]] 26.00&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[3jbb]] is a 12 chain structure with sequence from [https://en.wikipedia.org/wiki/Halomicronema_hongdechloris Halomicronema hongdechloris]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3JBB OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=3JBB 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]] 26&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=CYC:PHYCOCYANOBILIN'>CYC</scene>, <scene name='pdbligand=MEN:N-METHYL+ASPARAGINE'>MEN</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</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=3jbb FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3jbb OCA], [https://pdbe.org/3jbb PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=3jbb RCSB], [https://www.ebi.ac.uk/pdbsum/3jbb PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=3jbb ProSAT]</span></td></tr>
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== Function ==
[https://www.uniprot.org/uniprot/A0A0R4I959_9CYAN A0A0R4I959_9CYAN] 
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== Publication Abstract from PubMed ==
Phycobilisomes are the main light-harvesting protein complexes in cyanobacteria and some algae. It is commonly accepted that these complexes only absorb green and orange light, complementing chlorophyll absorbance. Here, we present a new phycobilisome derived complex that consists only of allophycocyanin core subunits, having red-shifted absorption peaks of 653 and 712nm. These red-shifted phycobiliprotein complexes were isolated from the chlorophyll f-containing cyanobacterium, Halomicronema hongdechloris, grown under monochromatic 730nm-wavelength (far-red) light. The 3D model obtained from single particle analysis reveals a double disk assembly of 120-145A with two alpha/beta allophycocyanin trimers fitting into the two separated disks. They are significantly smaller than typical phycobilisomes formed from allophycocyanin subunits and core-membrane linker proteins, which fit well with a reduced distance between thylakoid membranes observed from cells grown under far-red light. Spectral analysis of the dissociated and denatured phycobiliprotein complexes grown under both these light conditions shows that the same bilin chromophore, phycocyanobilin, is exclusively used. Our findings show that red-shifted phycobilisomes are required for assisting efficient far-red light harvesting. Their discovery provides new insights into the molecular mechanisms of light harvesting under extreme conditions for photosynthesis, as well as the strategies involved in flexible chromatic acclimation to diverse light conditions.

Characterization of red-shifted phycobilisomes isolated from the chlorophyll f-containing cyanobacterium Halomicronema hongdechloris.,Li Y, Lin Y, Garvey CJ, Birch D, Corkery RW, Loughlin PC, Scheer H, Willows RD, Chen M Biochim Biophys Acta. 2015 Oct 26;1857(1):107-114. doi:, 10.1016/j.bbabio.2015.10.009. PMID:26514405<ref>PMID:26514405</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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<div class="pdbe-citations 3jbb" style="background-color:#fffaf0;"></div>

==See Also==
*[[Allophycocyanin 3D structures|Allophycocyanin 3D structures]]
== References ==
<references/>
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[[Category: Halomicronema hongdechloris]]
[[Category: Large Structures]]
[[Category: Birch D]]
[[Category: Chen M]]
[[Category: Corkery RW]]
[[Category: Garvey C]]
[[Category: Li Y]]
[[Category: Lin Y]]
[[Category: Loughlin PC]]
[[Category: Scheer H]]
[[Category: Willows RD]]