ArticleNature communications2025
Mechanistic insights into single-stranded DNA degradation by lysosomal exonucleases PLD3 and PLD4 from structural snapshots.
Article in Nature communications, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
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.
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