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Predicted highly expressed genes in Nocardia farcinica and the implication for its primary metabolism and nocardial virulence

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Abstract

Nocardia farcinica is a Gram positive, filamentous bacterium, and is considered an opportunistic pathogen. In this study, the highly expressed genes in N. farcinica were predicted using the codon adaptation index (CAI) as a numerical estimator of gene expressivity. Using ribosomal protein (RP) genes as references, the top ∼ ∼10% of the genes were predicted to be the predicted highly expressed (PHX) genes in N. farcinica using a CAI cutoff of greater than 0.73. Consistent with earlier analysis of Streptomyces genomes, most of the PHX genes in N. farcinica were involved in various ‘house-keeping’ functions important for cell growth. However, 15 genes putatively involved in nocardial virulence were predicted as PHX genes in N. farcinica, which included genes encoding four Mce proteins, cyclopropane fatty acid synthase which is involved in the modification of cell wall which may be important for nocardia virulence, polyketide synthase PKS13 for mycolic acid synthesis and a non-ribosomal peptide synthetase involved in biosynthesis of a mycobactin-related siderophore. In addition, multiple genes involved in defense against reactive oxygen species (ROS) produced by the phagocyte were predicted with high expressivity, which included alkylhydroperoxide reductase (ahpC), catalase (katG), superoxide dismutase (sodF), thioredoxin, thioredoxin reductase, glutathione peroxidase, and peptide methionine sulfoxide reductase, suggesting that combating against ROS is essential for survival of N. farcinica in host cells. The study also showed that the distribution of PHX genes in the N. farcinica circular chromosome was uneven, with more PHX genes located in the regions close to replication initiation site. The results provided the first estimates of global gene expression patterns in N.␣farcinica, which will be useful in guiding experimental design for further investigations.

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Acknowledgements

Pacific Northwest National Laboratory is operated by Battelle Memorial Institute for the U.S. Department of Energy through contract DE-AC06-76RLO 1830.

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Authors and Affiliations

  1. Department of Biological Sciences, University of Maryland, Baltimore County, Baltimore, MD, 21250, USA

    Gang Wu

  2. Department of Biostatistics, Bioinformatics, and Biomathematics, Georgetown University, Washington, DC, 20057, USA

    Lei Nie

  3. Microbiology Department, Pacific Northwest National Laboratory, 902 Battelle Boulevard, 999, Richland, WA, 99352, USA

    Weiwen Zhang

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Correspondence to Weiwen Zhang.

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Wu, G., Nie, L. & Zhang, W. Predicted highly expressed genes in Nocardia farcinica and the implication for its primary metabolism and nocardial virulence. Antonie Van Leeuwenhoek 89, 135–146 (2006). https://doi.org/10.1007/s10482-005-9016-z

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