Archives of Microbiology

, Volume 189, Issue 2, pp 141–150 | Cite as

Transcript analysis of the Halothiobacillus neapolitanus cso operon

  • Fei Cai
  • Sabine Heinhorst
  • Jessup M. Shively
  • Gordon C. CannonEmail author
Original Paper


Carboxysomes are polyhedral microcompartments that sequester the CO2-fixing enzyme ribulose 1,5-bisphosphate carboxylase/oxygenase in many autotrophic bacteria. Their protein constituents are encoded by a set of tightly clustered genes that are thought to form an operon (the cso operon). This study is the first to systematically address transcriptional regulation of carboxysome protein expression. Quantification of transcript levels derived from the cso operon of Halothiobacillus neapolitanus, the sulfur oxidizer that has emerged as the model organism for carboxysome structural and functional studies, indicated that all cso genes are transcribed, albeit at different levels. Combined with comparative genomic evidence, this study supports the premise that the cso gene cluster constitutes an operon. Characterization of transcript 5′- and 3′-ends and examination of likely regulatory sequences and secondary structure elements within the operon suggested potential strategies by which the vastly different levels of individual carboxysome proteins in the microcompartment could have arisen.


Carboxysome operon Halothiobacillus neapolitanus Transcription Real-time PCR 



This work was supported by grants MCB-0444568 and DMR-0213883 from the National Science Foundation. The authors thank Dr. C. A. Kerfeld for critically reading a draft of this manuscript and for providing many helpful suggestions.


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Copyright information

© Springer-Verlag 2007

Authors and Affiliations

  • Fei Cai
    • 1
  • Sabine Heinhorst
    • 1
  • Jessup M. Shively
    • 1
    • 2
  • Gordon C. Cannon
    • 1
    Email author
  1. 1.Department of Chemistry and BiochemistryThe University of Southern MississippiHattiesburgUSA
  2. 2.Department of Genetics and BiochemistryClemson UniversityClemsonUSA

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