View source for 9vbh


==Cryo-EM structure of human PLD3 bound to ssDNA (poly(T))==
<StructureSection load='9vbh' size='340' side='right'caption='[[9vbh]], [[Resolution|resolution]] 2.85&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[9vbh]] is a 4 chain structure with sequence from [https://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens] and [https://en.wikipedia.org/wiki/Synthetic_construct Synthetic construct]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=9VBH OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=9VBH 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]] 2.85&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=BMA:BETA-D-MANNOSE'>BMA</scene>, <scene name='pdbligand=MAN:ALPHA-D-MANNOSE'>MAN</scene>, <scene name='pdbligand=NAG:N-ACETYL-D-GLUCOSAMINE'>NAG</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=9vbh FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=9vbh OCA], [https://pdbe.org/9vbh PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=9vbh RCSB], [https://www.ebi.ac.uk/pdbsum/9vbh PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=9vbh ProSAT]</span></td></tr>
</table>
== Disease ==
[https://www.uniprot.org/uniprot/PLD3_HUMAN PLD3_HUMAN] Spinocerebellar ataxia type 46. The disease may be caused by variants affecting the gene represented in this entry. There is limited evidences for implication of PLD3 in SCA46. Knockout mice do not present signs of cerebellar degeneration or spinocerebellar ataxia at 9 months of age, challenging the interpretation of the suggested loss-of-function mechanism for PLD3 as the SCA46-causative gene.<ref>PMID:30312375</ref>   Genetic variants in PLD3 have been suggested to be associated with an increased risk for Alzheimer disease (PubMed:24336208, PubMed:25832409). Further studies, however, did not support PLD3 involvement in this disease (PubMed:25832408, PubMed:25832410, PubMed:25832411, PubMed:25832413, PubMed:26411346). Futhermore, it is controversial whether PLD3 plays a role in amyloid precursor protein processing (APP) or not (PubMed:24336208). In a relevant Alzheimer's disease mouse model PLD3 deficiency does not affect APP metabolism or amyloid plaque burden (PubMed:28128235). However one study shown that PLD3 influences APP processing (PubMed:24336208).<ref>PMID:24336208</ref> <ref>PMID:25832408</ref> <ref>PMID:25832409</ref> <ref>PMID:25832410</ref> <ref>PMID:25832411</ref> <ref>PMID:25832413</ref> <ref>PMID:26411346</ref> <ref>PMID:28128235</ref> 
== Function ==
[https://www.uniprot.org/uniprot/PLD3_HUMAN PLD3_HUMAN] 5'->3' DNA exonuclease which digests single-stranded DNA (ssDNA) (PubMed:30312375). Regulates inflammatory cytokine responses via the degradation of nucleic acids, by reducing the concentration of ssDNA able to stimulate TLR9, a nucleotide-sensing receptor in collaboration with PLD4 (By similarity). May be important in myotube formation (PubMed:22428023). Plays a role in lysosomal homeostasis (PubMed:28128235). Involved in the regulation of endosomal protein sorting (PubMed:29368044).[UniProtKB:O35405]<ref>PMID:22428023</ref> <ref>PMID:28128235</ref> <ref>PMID:29368044</ref> <ref>PMID:30312375</ref> 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Lysosomal exonuclease phospholipase D (PLD) family PLD3 and PLD4 degrade single-stranded RNA or DNA and regulate TLR7 or TLR9 responses. Polymorphisms of these enzymes are associated with human diseases: PLD4 is associated with inflammatory diseases, and PLD3 is associated with neurodegenerative diseases. Here, we determine the structures of substrate-bound PLD3 and PLD4 by cryo-electron microscopy. Our structures reveal that PLD3 rebuilds a substrate-binding pocket, depending on the substrate, mainly via motion of the Phe335-containing loop. Furthermore, we captured the structure in a metastable state that appears during substrate rearrangement following product release. Together, our findings identify the residues that underlie the distinct activities of PLD3 and PLD4. This study provides a mechanistic basis for the exonuclease activity of PLD3 and PLD4 in single-stranded DNA degradation.

Mechanistic insights into single-stranded DNA degradation by lysosomal exonucleases PLD3 and PLD4 from structural snapshots.,Hirano Y, Ezaki W, Sato R, Ohto U, Miyake K, Shimizu T Nat Commun. 2025 Dec 11. doi: 10.1038/s41467-025-66261-2. PMID:41381514<ref>PMID:41381514</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 9vbh" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Homo sapiens]]
[[Category: Large Structures]]
[[Category: Synthetic construct]]
[[Category: Ezaki W]]
[[Category: Hirano Y]]
[[Category: Ohto U]]
[[Category: Shimizu T]]