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Dysregulated 3'-end processing of 18S pre-rRNA decreases mtPNPase efficiency in plant mitochondria.

Nucleic acids research - 8 Jun 2026

Kwasniak-Owczarek Malgorzata, Przystajko Blazej, Tomal Artur, Tran Huy Cuong, Kazmierczak Urszula, Eubel Holger, Ditz Noah, Van Aken Olivier, Janska Hanna

Abstract excerpt

In plant mitochondria, mitochondrial polynucleotide phosphorylase (mtPNPase) is a key 3'→5' exoribonuclease. Here, we describe the accumulation of mtPNPase substrates in Arabidopsis mutants, such as rps10 (deficient in the mitoribosomal protein uS10m), mtran1-2/2-2 (lacking the mitoribosomal proteins mTRAN1 and mTRAN2), and rpoTmp (deficient in plastid- and mitochondrial-targeted RNA polymerase). This...

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PMID: 42306946
DOI: 10.1093/nar/gkag609
PMCID: PMC13273313

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