Abstract
Caulobacter is a well-studied bacterial genus, but little is known about the plasmids that are found in some wild Caulobacter isolates. We used bioinformatic approaches to identify nine plasmids from seven different Caulobacter strains and grouped them based on their size and the similarity of their repABC, parAB, and mobAB genes. Protein pathway analysis of the genes on the K31p1 and K31p2 plasmids showed many metabolic pathways that would enhance the metabolic versatility of the host strain. In contrast, the CB4 plasmid contained 21 heavy metal resistance genes with the majority coding for proteins that enhance copper resistance. Growth assays of C. henricii CB4 demonstrated increased copper resistance and quantitative PCR showed an increase in the expression of eight heavy metal genes when induced with copper.
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This work was funded in part by Grant R25GM076277 to BE from the National Institutes of Health.
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TC performed the experimental work. Both BE and TC contributed to the design of the study, the interpretation of results, and the writing of the manuscript.
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284_2021_2742_MOESM2_ESM.tif
Supplementary file2 (TIF 90714 kb) Supplementary 2. Mauve alignment of the medium-sized plasmids. The red areas represent regions of nucleotide similarity between plasmids which includes replication, mobility, and partitioning genes in the same gene order for each plasmid.
284_2021_2742_MOESM3_ESM.tif
Supplementary file3 (TIF 87311 kb) Supplementary 3. Mauve alignment of the large-sized plasmids. Colored areas are areas of homology as determine by Mauve. The pink areas contain the repC gene, the purple areas contain parB gene, and the teal areas contain repAB, mobA, and parA genes. The dark purple areas contain fatty acid synthesis genes, while the hunter green areas contain branched-chain amino acid synthesis genes.
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Carter, T., Ely, B. Plasmids Bring Additional Capabilities to Caulobacter Isolates. Curr Microbiol 79, 45 (2022). https://doi.org/10.1007/s00284-021-02742-z
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DOI: https://doi.org/10.1007/s00284-021-02742-z