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Area of Science:

  • Plant Biology
  • Molecular Genetics
  • Mitochondrial Biology

Background:

  • Mitochondrial respiration relies on proteins from both nuclear and mitochondrial genomes.
  • Mitochondrial ribosomes translate many proteins essential for the respiratory chain.
  • Maize (Zea mays) kernel development is complex and sensitive to genetic perturbations.

Purpose of the Study:

  • To identify and characterize the function of the maize defective kernel44 (dek44) gene.
  • To investigate the role of the DEK44 protein in mitochondrial function and kernel development.
  • To understand the regulatory mechanisms underlying kernel development influenced by mitochondrial ribosomal proteins.

Main Methods:

  • Cloning of the Dek44 gene using Mutator tagging.
  • Subcellular fractionation and ultracentrifugation to confirm protein localization.
  • Transcriptome analysis and RT-qPCR to assess gene expression changes.
  • Blue native-PAGE to analyze respiratory chain complex assembly.
  • Transmission electron microscopy for mitochondrial morphology assessment.

Main Results:

  • Dek44 encodes a putative 50S ribosomal protein L9, localized to mitochondria.
  • Loss of DEK44 function in the dek44 mutant leads to embryo-lethal phenotypes and small kernels.
  • Mutant kernels show impaired expression of nuclear and mitochondrial respiratory chain genes.
  • Respiratory chain complex assembly is significantly reduced in dek44 mutant kernels.
  • Mitochondrial biogenesis and morphology are severely affected in the mutant.

Conclusions:

  • DEK44 is a crucial mitochondrial ribosomal protein for maize kernel development.
  • Disruption of DEK44 impacts mitochondrial respiration and overall kernel viability.
  • DEK44 function is linked to the regulation of nuclear and mitochondrial gene expression related to respiration.
  • The study highlights the importance of mitochondrial ribosomal protein function in plant development and mitochondrial integrity.