View source for 9fqr


==96-nm repeat of axonemal doublet microtubules from bovine sperm==
<StructureSection load='9fqr' size='340' side='right'caption='[[9fqr]], [[Resolution|resolution]] 5.00&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[9fqr]] is a 151 chain structure with sequence from [https://en.wikipedia.org/wiki/Bos_taurus Bos taurus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=9FQR OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=9FQR 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]] 5&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=GDP:GUANOSINE-5-DIPHOSPHATE'>GDP</scene>, <scene name='pdbligand=GTP:GUANOSINE-5-TRIPHOSPHATE'>GTP</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</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=9fqr FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=9fqr OCA], [https://pdbe.org/9fqr PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=9fqr RCSB], [https://www.ebi.ac.uk/pdbsum/9fqr PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=9fqr ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/CFA96_BOVIN CFA96_BOVIN] 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Reproduction, development and homeostasis depend on motile cilia, whose rhythmic beating is powered by a microtubule-based molecular machine called the axoneme. Although an atomic model of the axoneme is available for the alga Chlamydomonas reinhardtii(1), structures of mammalian axonemes are incomplete(1-5). Furthermore, we do not fully understand how molecular structures of axonemes vary across motile-ciliated cell types in the body. Here we use cryoelectron microscopy, cryoelectron tomography and proteomics to resolve the 96-nm modular repeat of axonemal doublet microtubules (DMTs) from both sperm flagella and epithelial cilia of the oviduct, brain ventricles and respiratory tract. We find that sperm DMTs are the most specialized, with epithelial cilia having only minor differences across tissues. We build a model of the mammalian sperm DMT, defining the positions and interactions of 181 proteins including 34 newly identified proteins. We elucidate the composition of radial spoke 3 and uncover binding sites of kinases associated with regeneration of ATP and regulation of ciliary motility. We discover a sperm-specific, axoneme-tethered T-complex protein ring complex (TRiC) chaperone that may contribute to construction or maintenance of the long flagella of mammalian sperm. We resolve axonemal dyneins in their prestroke states, illuminating conformational changes that occur during ciliary movement. Our results illustrate how elements of chemical and mechanical regulation are embedded within the axoneme, providing valuable resources for understanding the aetiology of ciliopathy and infertility, and exemplifying the discovery power of modern structural biology.

Structural diversity of axonemes across mammalian motile cilia.,Leung MR, Sun C, Zeng J, Anderson JR, Niu Q, Huang W, Noteborn WEM, Brown A, Zeev-Ben-Mordehai T, Zhang R Nature. 2025 Jan;637(8048):1170-1177. doi: 10.1038/s41586-024-08337-5. Epub 2025 , Jan 1. PMID:39743588<ref>PMID:39743588</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 9fqr" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Bos taurus]]
[[Category: Large Structures]]
[[Category: Anderson JR]]
[[Category: Brown A]]
[[Category: Huang W]]
[[Category: Leung MR]]
[[Category: Niu Q]]
[[Category: Noteborn WEM]]
[[Category: Sun C]]
[[Category: Zeev-Ben-Mordehai T]]
[[Category: Zeng J]]
[[Category: Zhang R]]