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• W1977740015 abstract "Although the implications of calcium carbonate (CaCO3) precipitation by microorganisms in natural environments are quite relevant, the physiology and genetics of this phenomenon are poorly understood. We have chosen Bacillus subtilis 168 as our model to study which physiological aspects are associated with CaCO3 (calcite) formation during biofilm development when grown on precipitation medium. A B. subtilis eftA mutant named FBC5 impaired in calcite precipitation was used for comparative studies. Our results demonstrate that inactivation of etfA causes a decrease in the pH of the precipitation medium during biofilm development. Further analysis demonstrated that eftA extrudes an excess of 0.7 mol H+ L−1 with respect to B. subtilis 168 strain. Using media buffered at different pH values, we were able to control calcite formation. Because etfA encodes the α-subunit of a putative flavoprotein involved in fatty acid metabolism, we compared the intracellular levels of NADH among strains. Our physiological assay showed that FBC5 accumulated up to 32 times more NADH than the wild-type strain. We propose that the accumulation of NADH causes a deregulation in the generation of the proton motive force (ΔμH+) in FBC5 producing the acidification." @default.
• W1977740015 created "2016-06-24" @default.
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• W1977740015 date "2010-03-01" @default.
• W1977740015 modified "2023-10-18" @default.
• W1977740015 title "Physiological requirements for carbonate precipitation during biofilm development of<i>Bacillus subtilis etfA</i>mutant" @default.
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• W1977740015 doi "https://doi.org/10.1111/j.1574-6941.2009.00805.x" @default.
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