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Int. J. Mol. Sci. 2015, 16(6), 13579-13594; doi:10.3390/ijms160613579

Cloning, Expression and Characterization of a Thermostable Esterase HydS14 from Actinomadura sp. Strain S14 in Pichia pastoris

1
Department of Biology, Faculty of Sciences, Srinakharinwirot University, Bangkok 10110, Thailand
2
Center for Nanomaterials and Devices, Kyoto Institute of Technology, Matsugasaki, Sakyo-ku, Kyoto 606-8585, Japan
3
Innovative Learning Center, Srinakharinwirot University, Bangkok 10110, Thailand
4
Department of Biochemistry, Faculty of Medicine, Srinakharinwirot University, Bangkok 10110, Thailand
5
Faculty of Environmental Culture and Ecotourism, Srinakharinwirot University, Bangkok 10110, Thailand
*
Author to whom correspondence should be addressed.
Academic Editor: Ritva Tikkanen
Received: 20 January 2015 / Revised: 3 June 2015 / Accepted: 3 June 2015 / Published: 12 June 2015
(This article belongs to the Section Biochemistry, Molecular and Cellular Biology)
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Abstract

A thermostable esterase gene (hydS14) was cloned from an Actinomadura sp. S14 gene library. The gene is 777 bp in length and encodes a polypeptide of 258 amino acid residues with no signal peptide, no N-glycosylation site and a predicted molecular mass of 26,604 Da. The encoded protein contains the pentapeptide motif (GYSLG) and catalytic triad (Ser88-Asp208-His235) of the esterase/lipase superfamily. The HydS14 sequence shows 46%–64% identity to 23 sequences from actinomycetes (23 α/β-hydrolases), has three conserved regions, and contains the novel motif (GY(F)SLG), which distinguishes it from other clusters in the α/β-hydrolase structural superfamily. A plasmid containing the coding region (pPICZαA-hydS14) was used to express HydS14 in Pichia pastoris under the control of the AOXI promoter. The recombinant HydS14 collected from the supernatant had a molecular mass of ~30 kDa, which agrees with its predicted molecular mass without N-glycosylation. HydS14 had an optimum temperature of approximately 70 °C and an optimum pH of 8.0. HydS14 was stable at 50 and 60 °C for 120 min, with residual activities of above 80% and above 90%, respectively, as well as 50% activity at pH 6.0–8.0 and pH 9.0, respectively. The enzyme showed higher activity with p-nitrophenyl-C2 and C4. The Km and Vmax values for p-nitrophenyl-C4 were 0.21 ± 0.02 mM and 37.07 ± 1.04 μmol/min/mg, respectively. The enzyme was active toward short-chain p-nitrophenyl ester (C2–C6), displaying optimal activity with p-nitrophenyl-C4 (Kcat/Km = 11.74 mM−1·S−1). In summary, HydS14 is a thermostable esterase from Actinomadura sp. S14 that has been cloned and expressed for the first time in Pichia pastoris. View Full-Text
Keywords: Actinomadura sp.; esterase; α/β-hydrolase superfamily; lipolytic family; thermophile Actinomadura sp.; esterase; α/β-hydrolase superfamily; lipolytic family; thermophile
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Sriyapai, P.; Kawai, F.; Siripoke, S.; Chansiri, K.; Sriyapai, T. Cloning, Expression and Characterization of a Thermostable Esterase HydS14 from Actinomadura sp. Strain S14 in Pichia pastoris. Int. J. Mol. Sci. 2015, 16, 13579-13594.

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