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Protein Synthesis in Isolated Mitochondria of Rice (Oryza sativa L.) Seedlings

H Dai1, Y S Lo, C Y Wu

  • 1Institute of Botany, Academia Sinica, Taipei, Taiwan, Republic of China.

Plant Physiology
|May 1, 1991
PubMed

Insights

Researchers developed a bacteria-free rice mitochondria preparation for studying mitochondrial protein synthesis. This method overcomes bacterial contamination, enabling accurate analysis of in organello protein synthesis in rice.

Area of Science:

  • Plant Biology
  • Mitochondrial Biology
  • Biochemistry

Background:

  • Conventional surface-sterilization is ineffective for rice mitochondria studies.
  • Bacterial contamination significantly interferes with accurate analysis of mitochondrial protein synthesis.
  • Existing methods yield unsuitable "essentially bacteria-free" rice mitochondria.

Purpose of the Study:

  • To develop a reliable procedure for obtaining bacteria-free rice mitochondria.
  • To investigate in organello mitochondrial protein synthesis in rice.
  • To characterize the products of rice mitochondrial protein synthesis.

Main Methods:

  • Developed a novel procedure to achieve bacteria-free rice mitochondria.
  • Utilized a membrane-dependent ATP-generating system for energy supplementation.
  • Employed [(35)S]methionine labeling and cycloheximide treatment for product analysis.
  • Analyzed protein products using electrophoresis.

Main Results:

  • Successfully obtained bacteria-free rice mitochondria.
  • Demonstrated that bacteria-free mitochondria prefer a membrane-dependent ATP system.
  • Identified two classes of cycloheximide-insensitive protein synthesis products.
  • Characterized 22-27 discrete polypeptide species with distinct mobilities and abundances.

Conclusions:

  • The developed procedure yields bacteria-free rice mitochondria suitable for in organello protein synthesis studies.
  • Rice mitochondria utilize a membrane-dependent ATP system for protein synthesis.
  • Characterization of synthesized polypeptides provides insights into rice mitochondrial gene expression.

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