Abstract
Pseudomonas sp. strain MC1 was characterized as a cold-adapted, naphthalene-degrading bacterium that is able to grow in a broad temperature range of 5–30°C. MC1 harbors a catabolic plasmid, designated pYIC1, which is almost identical to the archetypal NAH7 plasmid from the mesophilic bacterium Pseudomonas putida G7. On pYIC1, the catabolic genes for naphthalene degradation are clustered in two operons: nahAa-Ab-Ac-Ad-B-F-C-Q-E-D encoding the conversion of naphthalene to salicylate, and nahG-T-H-I-N-L-O-M-K-J encoding the conversion of salicylate through meta-cleavage pathway to pyruvate and acetyl CoA. NahH, the bona fide extradiol dioxygenase in MC1 salicylate metabolism, is thermolabile and is a cold-adapted enzyme. The thermal profiles of the NahH enzyme activities expressed in different hosts indicate the presence of a factor(s) or mechanism(s) to protect the thermolabile NahH enzyme (100% aa identity with MC1 counterpart) in G7. Overall, the results reported in the present work suggest that the thermolabile NahH might be a product of the cold-adaptation process of MC1 and thus contribute to the survival and growth ability of MC1 on salicylate and naphthalene in cold environments.
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Acknowledgments
We thank Professor Kyung Lee at Changwon National University for his kind gift of Pseudomonas putida G7. This work was financially supported by a grant to the Korea Polar Research Institute (project PM15050) from the Ministry of Oceans and Fisheries, Korea.
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Ahn, E., Choi, K., Kang, B.S. et al. Salicylate degradation by a cold-adapted Pseudomonas sp.. Ann Microbiol 67, 417–424 (2017). https://doi.org/10.1007/s13213-017-1273-3
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DOI: https://doi.org/10.1007/s13213-017-1273-3