Abstract
A gene encoding an esterase, ThaEst2349, was identified in the marine psychrophilic bacterium Thalassospira sp. GB04J01. The gene was cloned and overexpressed in E. coli as a His-tagged fusion protein. The recombinant enzyme showed optimal activity at 45 °C and the thermal stability displayed a retention of 75 % relative activity at 40 °C after 2 h. The optimal pH was 8.5 but the enzyme kept more than 75 % of its maximal activity between pH 8.0 and 9.5. ThaEst2349 also showed remarkable tolerance towards high concentrations of salt and it was active against short-chain p-nitrophenyl esters, displaying optimal activity with the acetate. The enzyme was tested for tolerance of organic solvents and the results are suggesting that it could function as an interesting candidate for biotechnological applications. The crystal structure of ThaEst2349 was determined to 1.69 Å revealing an asymmetric unit containing two chains, which also is the biological unit. The structure has a characteristic cap domain and a catalytic triad comprising Ser158, His285 and Asp255. To explain the cold-active nature of the enzyme, we compared it against thermophilic counterparts. Our hypothesis is that a high methionine content, less hydrogen bonds and less ion pairs render the enzyme more flexible at low temperatures.
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Acknowledgments
We thank the Research Council of Norway for supporting part of this work by the Grant (No. 219710/F11) within the YGGDRASIL mobility program. This study was supported by The Research Council of Norway, the Functional Genomics Program (FUGE) through The Norwegian Structural Biology Centre (NorStruct). Provision of beam time at Bessy II, Berlin Germany at BL14.2 is gratefully acknowledged.
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De Santi, C., Leiros, HK.S., Di Scala, A. et al. Biochemical characterization and structural analysis of a new cold-active and salt-tolerant esterase from the marine bacterium Thalassospira sp.. Extremophiles 20, 323–336 (2016). https://doi.org/10.1007/s00792-016-0824-z
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DOI: https://doi.org/10.1007/s00792-016-0824-z