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Proteins targeted to the inner chloroplast membrane, or plastid proteins, are transported by two general pathways: the stop-transfer and the re-insertion or post-import pathways. Most plastid proteins carry N-terminal transit sequences and internal import sequences targeting it to the specific chloroplast subcompartment. Proteins targeted by the stop-transfer pathway have internal hydrophobic sequences that inhibit their translocation into the stroma. As a result, these precursors are arrested...
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Transposons make up a significant part of genomes of various organisms. Therefore, it is believed that transposition played a major evolutionary role in speciation by changing genome sizes and modifying gene expression patterns. For example, in bacteria, transposition can lead to conferring antibiotic resistance. Movement of transposable elements within the genetic pool of pathogenic bacteria can aid in transfer of antibiotic-resistant genetic elements. In eukaryotes, transposons can carry out...
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Transfer RNA genes ofZea mays chloroplast DNA.

R F Selden1, A Steinmetz, L McIntosh

  • 1The Biological Laboratories, Harvard University, Cambridge, Massachusetts, USA.

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Summary

Researchers mapped 37 transfer RNA (tRNA) genes for 17 amino acids on the Zea mays chloroplast DNA. This detailed gene map provides insights into chloroplast gene organization and function in maize.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Plant Science

Background:

  • Chloroplast DNA (cpDNA) encodes essential genes for photosynthesis and gene expression.
  • Transfer RNA (tRNA) genes are crucial for protein synthesis within chloroplasts.
  • Understanding the organization of tRNA genes on cpDNA is vital for studying chloroplast gene regulation.

Purpose of the Study:

  • To precisely map the locations of transfer RNA (tRNA) genes on the Zea mays chloroplast DNA molecule.
  • To analyze the distribution of tRNA genes within different regions of the maize chloroplast genome.
  • To identify the number and types of tRNA genes, including isoaccepting tRNAs, encoded by maize cpDNA.

Main Methods:

  • Utilized restriction endonuclease digestion to create a physical map of Zea mays chloroplast DNA.
  • Employed hybridization techniques with radioactively-labeled total 4S RNAs and in vitro 32P-labeled individual tRNAs.
  • Combined Southern blotting with gel electrophoresis for precise localization and identification of tRNA genes.

Main Results:

  • Successfully mapped a minimum of 37 tRNA genes for 17 different amino acids on the maize chloroplast DNA.
  • Identified the distribution of these tRNA genes across single-copy regions and the inverted repeat regions of the cpDNA.
  • Confirmed that multiple isoaccepting tRNA species for several amino acids are encoded at distinct loci within the chloroplast genome.

Conclusions:

  • The study provides a comprehensive physical map of tRNA genes on Zea mays chloroplast DNA.
  • The findings contribute to a deeper understanding of chloroplast genome organization and the genetic basis of protein synthesis in maize.
  • This detailed map serves as a valuable resource for future research on chloroplast gene expression and evolution.