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PEN1 catalyses RNA primer removal during plastid DNA replication in maize.

Xing Huang1, Guolong Shi1,2, Qiao Xiao1

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Scientists identified a maize enzyme, plastid-encoded exonuclease 1 (PEN1), crucial for removing RNA primers during plastid DNA replication. PEN1

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Area of Science:

  • Molecular Biology
  • Plant Science
  • Genetics

Background:

  • Plastid DNA (ptDNA) replication requires RNA primer removal before DNA fragment ligation.
  • The enzymes and mechanisms responsible for ptDNA primer excision remain largely unknown.
  • Understanding this process is critical for comprehending ptDNA replication fidelity.

Purpose of the Study:

  • To identify and characterize the enzyme responsible for RNA primer removal in maize plastids.
  • To elucidate the mechanism and structural basis of this enzymatic activity.
  • To investigate the in vivo consequences of impaired primer removal on plastid function.

Main Methods:

  • Cloning and characterization of a maize gene encoding a plastid-localized exonuclease (PEN1).
  • In vitro reconstitution of plastid RNA primer removal assays.
  • Determination of the crystal structure of PEN1 in complex with double-stranded DNA.
  • Analysis of developmental phenotypes in maize mutants lacking functional PEN1.

Main Results:

  • A novel Mn2+-dependent 5'-3' exonuclease, PEN1, was identified in maize plastids.
  • PEN1 efficiently cleaves RNA primers, enabling complete ribonucleotide excision.
  • PEN1 mutation leads to developmental defects and accumulation of ptDNA breaks, impairing plastid function.
  • The crystal structure reveals the mechanism of PEN1's exonuclease activity.

Conclusions:

  • PEN1 is the key enzyme responsible for RNA primer removal during maize plastid DNA replication.
  • This study elucidates the molecular mechanism and structural basis of PEN1 activity.
  • The findings fill a significant knowledge gap in ptDNA replication and maintenance.