Abstract
Escherichia coli is able to utilize l-galactonate as a sole carbon source. A metabolic pathway for l-galactonate catabolism is described in E. coli, and it is known to be interconnected with d-galacturonate metabolism. The corresponding gene encoding the first enzyme in the l-galactonate pathway, l-galactonate-5-dehydrogenase, was suggested to be yjjN. However, l-galactonate dehydrogenase activity was never demonstrated with the yjjN gene product. Here, we show that YjjN is indeed an l-galactonate dehydrogenase having activity also for l-gulonate. The K m and k cat for l-galactonate were 19.5 ± 0.6 mM and 0.51 ± 0.03 s−1, respectively. In addition, YjjN was applied for a quantitative detection of the both of these substances in a coupled assay. The detection limits for l-galactonate and l-gulonate were 1.65 and 10 μM, respectively.




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Acknowledgments
This study was supported by the Academy of Finland through the Sustainable Energy (SusEn) program (grant 271025) and by the CNPq from Brazil in the form of a cooperation project. We thank Prof. Jack T. Pronk for providing d-tagaturonic acid and Anna-Liisa Ruskeepää and Ismo Mattila for the GC/MS analysis.
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Kuivanen, J., Richard, P. The yjjN of E. coli codes for an l-galactonate dehydrogenase and can be used for quantification of l-galactonate and l-gulonate. Appl Biochem Biotechnol 173, 1829–1835 (2014). https://doi.org/10.1007/s12010-014-0969-0
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DOI: https://doi.org/10.1007/s12010-014-0969-0


