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SMALL KERNEL4 is required for mitochondrial cox1 transcript editing and seed development in maize.

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The small kernel4 (smk4) gene is crucial for maize growth, regulating mitochondrial function through RNA editing. Loss of Smk4 impairs plant development and kernel size by affecting cytochrome c oxidase1 (cox1) editing.

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Area of Science:

  • Plant Biology
  • Molecular Biology
  • Genetics

Background:

  • Cytidine-to-uridine (C-to-U) editing in plant organelles is vital for restoring protein function.
  • Pentatricopeptide repeat (PPR) proteins are key regulators of C-to-U editing, but many functions remain unknown.

Purpose of the Study:

  • To characterize the function of the Smk4 protein in maize.
  • To investigate the role of Smk4 in plant growth, development, and organellar RNA editing.

Main Methods:

  • Characterization of a maize mutant with a null mutation in the Smk4 gene.
  • Gene cloning and protein localization studies.
  • Analysis of C-to-U editing in organellar transcripts and mitochondrial complex IV activity.

Main Results:

  • Smk4 null mutants exhibit stunted growth, delayed flowering, and smaller kernels.
  • Smk4 encodes an E-subclass PPR protein localized to mitochondria.
  • Loss of Smk4 function disrupts C-to-U editing at cox1-1489, leading to an amino acid change in Cox1.
  • Mitochondrial complex IV activity is reduced, and alternative oxidases (AOX) expression is elevated in smk4 mutants.

Conclusions:

  • SMK4 is essential for C-to-U editing of the cox1 transcript in maize mitochondria.
  • This specific RNA editing event is critical for the activity of mitochondrial complex IV.
  • SMK4 plays a vital role in regulating maize plant growth and kernel development.