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'''Unreleased structure'''


The entry 28lu is ON HOLD
==Structure of the Chlamydomonas reinhardtii chlororibosome with factor pY==
<StructureSection load='28lu' size='340' side='right'caption='[[28lu]], [[Resolution|resolution]] 2.60&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[28lu]] is a 10 chain structure with sequence from [https://en.wikipedia.org/wiki/Chlamydomonas_reinhardtii Chlamydomonas reinhardtii]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=28LU OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=28LU 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]] 2.6&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=2MA:2-METHYLADENOSINE-5-MONOPHOSPHATE'>2MA</scene>, <scene name='pdbligand=2MG:2N-METHYLGUANOSINE-5-MONOPHOSPHATE'>2MG</scene>, <scene name='pdbligand=4OC:4N,O2-METHYLCYTIDINE-5-MONOPHOSPHATE'>4OC</scene>, <scene name='pdbligand=5MC:5-METHYLCYTIDINE-5-MONOPHOSPHATE'>5MC</scene>, <scene name='pdbligand=5MU:5-METHYLURIDINE+5-MONOPHOSPHATE'>5MU</scene>, <scene name='pdbligand=6MZ:N6-METHYLADENOSINE-5-MONOPHOSPHATE'>6MZ</scene>, <scene name='pdbligand=G7M:N7-METHYL-GUANOSINE-5-MONOPHOSPHATE'>G7M</scene>, <scene name='pdbligand=H2U:5,6-DIHYDROURIDINE-5-MONOPHOSPHATE'>H2U</scene>, <scene name='pdbligand=K:POTASSIUM+ION'>K</scene>, <scene name='pdbligand=MA6:6N-DIMETHYLADENOSINE-5-MONOPHOSHATE'>MA6</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene>, <scene name='pdbligand=OMC:O2-METHYLYCYTIDINE-5-MONOPHOSPHATE'>OMC</scene>, <scene name='pdbligand=OMG:O2-METHYLGUANOSINE-5-MONOPHOSPHATE'>OMG</scene>, <scene name='pdbligand=OMU:O2-METHYLURIDINE+5-MONOPHOSPHATE'>OMU</scene>, <scene name='pdbligand=UR3:3-METHYLURIDINE-5-MONOPHOSHATE'>UR3</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=28lu FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=28lu OCA], [https://pdbe.org/28lu PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=28lu RCSB], [https://www.ebi.ac.uk/pdbsum/28lu PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=28lu ProSAT]</span></td></tr>
</table>
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Chloroplast ribosomes (chlororibosomes) synthesize the core protein components of the photosynthetic apparatus, yet their structural diversity outside flowering plants remains largely unexplored. Here, we combine in situ cryo-electron tomography (cryo-ET) with single-particle cryo-electron microscopy (cryo-EM) to determine the structure of the chlororibosome from the unicellular green alga Chlamydomonas reinhardtii. Subtomogram averaging of chlororibosomes in their native environment, resolved to ~5 A resolution and in distinct translational states, reveals particles both free in the stroma and loosely tethered to thylakoid membranes. These in situ reconstructions uncover an additional "arm" domain on the small subunit. High-resolution single-particle reconstruction of isolated chlororibosomes to ~2.5 A, in states bound either to the inhibitory translation factor pY or to a nascent chain-linked P-site tRNA, reveals that this domain is built primarily from extensive chloroplast-encoded insertions and extensions of conserved small subunit proteins, supported by chlororibosome-specific ribosomal proteins. The arm domain is located around the mRNA entry and exit channels, suggesting a role in stabilizing the mRNA trajectory through the small subunit and organizing chloroplast polysomes. Together, these data reveal unexpected structural variation of algal chlororibosomes and suggest that chloroplast translation has diversified substantially even among relatively closely related photosynthetic lineages.


Authors: Waltz, F., Kater, L., Engel, B.D.
Chloroplast-encoded small subunit extensions reshape the Chlamydomonas chlororibosome.,Waltz F, Lehner PA, Van der Stappen P, Kater L, Pfeffer S, Engel BD bioRxiv [Preprint]. 2026 Feb 9:2026.02.07.704542. doi: , 10.64898/2026.02.07.704542. PMID:41727112<ref>PMID:41727112</ref>


Description: Structure of the Chlamydomonas reinhardtii chlororibosome with factor pY
From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
[[Category: Unreleased Structures]]
</div>
[[Category: Engel, B.D]]
<div class="pdbe-citations 28lu" style="background-color:#fffaf0;"></div>
[[Category: Kater, L]]
== References ==
[[Category: Waltz, F]]
<references/>
__TOC__
</StructureSection>
[[Category: Chlamydomonas reinhardtii]]
[[Category: Large Structures]]
[[Category: Engel BD]]
[[Category: Kater L]]
[[Category: Waltz F]]
Retrieved from "https://proteopedia.org/28lu"