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Characterization of esterase activity from an Acetomicrobium hydrogeniformans enzyme with high structural stability in extreme conditions

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Abstract

The biotechnological and industrial uses of thermostable and organic solvent-tolerant enzymes are extensive and the investigation of such enzymes from microbiota present in oil reservoirs is a promising approach. Searching sequence databases for esterases from such microbiota, we have identified in silico a potentially secreted esterase from Acetomicrobium hydrogeniformans, named AhEst. The recombinant enzyme was produced in E. coli to be used in biochemical and biophysical characterization studies. AhEst presented hydrolytic activity on short-acyl-chain p-nitrophenyl ester substrates. AhEst activity was high and stable in temperatures up to 75 °C. Interestingly, high salt concentration induced a significant increase of catalytic activity. AhEst still retained ~ 50% of its activity in 30% concentration of several organic solvents. Synchrotron radiation circular dichroism and fluorescence spectroscopies confirmed that AhEst displays high structural stability in extreme conditions of temperature, salinity, and organic solvents. The enzyme is a good emulsifier agent and is able to partially reverse the wettability of an oil-wet carbonate substrate, making it of potential interest for use in enhanced oil recovery. All the traits observed in AhEst make it an interesting candidate for many industrial applications, such as those in which a significant hydrolytic activity at high temperatures is required.

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Abbreviations

AhEst:

Acetomicrobium hydrogeniformans esterase

CD:

Circular dichroism

EOR:

Enhanced oil recovery

HMM:

Hidden Markov models

MRW:

Mean residue weight

NATA:

N-Acetyl-tryptophanamide

pNA:

p-Nitrophenyl acetate

pNB:

p-Nitrophenyl butyrate

SEC:

Size-exclusion chromatography

SRCD:

Synchrotron radiation circular dichroism

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Acknowledgements

Authors are grateful for the support of paired UK–Brazil partnering grants from the Biotechnology and Biological Sciences Research Council (BBSRC) and Sao Paulo Research Foundation (FAPESP) Grant FAPPA to APUA and BAW. We thank the beamline access to the AU-CD beamline on ASTRID2 at ISA Synchrotron (Aarhus, Denmark) (to JLSL and PSK).

Funding

This study was supported by Biotechnology and Biological Sciences Research Council (BBSRC) Grant N012763 to BAW; Sao Paulo Research Foundation (FAPESP) Grant FAPPA 15/50347-2 to APUA; National Council for Scientific and Technological Development (CNPq) Grants 407337/2013-0 to APUA; 406429/2016-2 and 303513/2016-0 to JLSL and Grant 150417/2016-0 to PSK; Petrobras (Petróleo Brasileiro S.A.) Grant to NRSB and DTI fellowships to JMM and RFG (cooperation agreement 0050.0079046.12.9, resources regulated by the Brazilian National Agency of Petroleum, Natural Gas and Biofuels—ANP resolution 05/2015).

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Correspondence to Ana P. U. Araujo.

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The authors declare that they have no conflict of interest.

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This article does not contain any studies with human participants or animals performed by any of the authors.

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Communicated by F. Robb.

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Kumagai, P.S., Gutierrez, R.F., Lopes, J.L.S. et al. Characterization of esterase activity from an Acetomicrobium hydrogeniformans enzyme with high structural stability in extreme conditions. Extremophiles 22, 781–793 (2018). https://doi.org/10.1007/s00792-018-1038-3

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  • DOI: https://doi.org/10.1007/s00792-018-1038-3

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