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Carboxysome genomics: a status report.

Gordon C Cannon1, Sabine Heinhorst2, Christopher E Bradburne3

  • 1Department of Chemistry and Biochemistry, University of Southern Mississippi, Hattiesburg, MS 39406, USA.Corresponding author;

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Summary
This summary is machine-generated.

Carboxysome genes involved in carbon fixation are conserved across diverse bacteria. Gene organization varies between cyanobacteria and chemoautotrophs, but functional homology is evident, aiding CO2 concentration mechanisms.

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Area of Science:

  • Microbiology
  • Molecular Biology
  • Biochemistry

Background:

  • Carboxysomes enhance carbon dioxide fixation by Rubisco in chemoautotrophs and cyanobacteria.
  • The genes encoding carboxysome shell peptides and Rubisco subunits are organized in operons.

Purpose of the Study:

  • To investigate the organization and homology of carboxysome genes across different bacterial species.
  • To compare the genetic organization of carboxysomes in thiobacilli and cyanobacteria.

Main Methods:

  • DNA sequencing of carboxysome genes in Halothiobacillus neapolitanus and related thiobacilli.
  • Comparative analysis of carboxysome gene clusters in cyanobacteria, including Synechococcus and Prochlorococcus species.

Main Results:

  • Identified conserved carboxysome gene operons in thiobacilli (H. neapolitanus, A. ferrooxidans, T. intermedia, T. denitrificans).
  • Revealed distinct but homologous carboxysome gene clusters (ccm genes) in cyanobacteria (Synechococcus, Nostoc).
  • Observed a nearly identical operon structure in marine cyanobacteria (Prochlorococcus, Synechococcus WH8102) to that of thiobacilli, with high sequence identity.

Conclusions:

  • Carboxysome gene organization is conserved within thiobacilli and shows homology across diverse cyanobacteria.
  • Marine cyanobacteria share a highly similar carboxysome operon structure with thiobacilli, indicating potential horizontal gene transfer or shared ancestry.