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Farmer RM, Laguna R, Panescu J, McCoy A, Logsdon B, Zianni M, Moskvin OV, Gomelsky M, Tabita FR. Altered residues in key proteins influence the expression and activity of the nitrogenase complex in an adaptive CO2 fixation-deficient mutant strain of Rhodobacter sphaeroides. Microbiology (Reading) 2014; 160:198-208. [PMID: 24126349 DOI: 10.1099/mic.0.073031-0] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Previously, the RubisCO-compromised spontaneous adaptive Rhodobacter sphaeroides mutant, strain 16PHC, was shown to derepress the expression of genes that encode the nitrogenase complex under normal repressive conditions. As a result of this adaptation, the active nitrogenase complex restored redox balance, thus allowing strain 16PHC to grow under photoheterotrophic conditions in the absence of an exogenous electron acceptor. A combination of whole genome pyrosequencing and whole genome microarray analyses was employed to identify possible loci responsible for the observed phenotype. Mutations were found in two genes, glnA and nifA, whose products are involved in the regulatory cascade that controls nitrogenase complex gene expression. In addition, a nucleotide reversion within the nifK gene, which encodes a subunit of the nitrogenase complex, was also identified. Subsequent genetic, physiological and biochemical studies revealed alterations that led to derepression of the synthesis of an active nitrogenase complex in strain 16PHC.
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Affiliation(s)
- Ryan M. Farmer
- Department of Microbiology, Ohio State University, 484 West 12th Avenue, Columbus, OH 43210, USA
| | - Rick Laguna
- Department of Microbiology, Ohio State University, 484 West 12th Avenue, Columbus, OH 43210, USA
| | - Jenny Panescu
- Plant-Microbe Genomics Facility, Ohio State University, 484 West 12th Avenue, Columbus, OH 43210, USA
| | - Anthony McCoy
- Plant-Microbe Genomics Facility, Ohio State University, 484 West 12th Avenue, Columbus, OH 43210, USA
| | - Beth Logsdon
- Plant-Microbe Genomics Facility, Ohio State University, 484 West 12th Avenue, Columbus, OH 43210, USA
| | - Mike Zianni
- Plant-Microbe Genomics Facility, Ohio State University, 484 West 12th Avenue, Columbus, OH 43210, USA
| | - Oleg V. Moskvin
- Department of Molecular Biology, University of Wyoming, Laramie, WY 82071, USA
| | - Mark Gomelsky
- Department of Molecular Biology, University of Wyoming, Laramie, WY 82071, USA
| | - F. Robert Tabita
- Plant-Microbe Genomics Facility, Ohio State University, 484 West 12th Avenue, Columbus, OH 43210, USA
- Department of Microbiology, Ohio State University, 484 West 12th Avenue, Columbus, OH 43210, USA
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Nitrogen and Molybdenum Control of Nitrogen Fixation in the Phototrophic Bacterium Rhodobacter capsulatus. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2010; 675:49-70. [DOI: 10.1007/978-1-4419-1528-3_4] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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