Cloning, heterologous expression, and characterization of a novel thioesterase from natural sample

Suharti; Gita Mahardika; Raissa; Laksmi Dewi; Heni Yohandini; Made Puspasari Widhiastuty; Raden Aditya Wibawa Sakti; Setyanto Tri Wahyudi; Akhmaloka

doi:10.1016/j.heliyon.2021.e06542

Cloning, heterologous expression, and characterization of a novel thioesterase from natural sample

Heliyon. 2021 Mar 24;7(3):e06542. doi: 10.1016/j.heliyon.2021.e06542. eCollection 2021 Mar.

Authors

Suharti^{1

2}, Gita Mahardika¹, Raissa², Laksmi Dewi³, Heni Yohandini^{1

4}, Made Puspasari Widhiastuty¹, Raden Aditya Wibawa Sakti², Setyanto Tri Wahyudi^{1

5}, Akhmaloka^{1

2}

Affiliations

¹ Biochemistry Research Group, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jl. Ganesha 10, Bandung, Indonesia.
² Department of Chemistry, Faculty of Science and Computer, Universitas Pertamina, Jl. Teuku Nyak Arief, Simprug Kebayoran, South Jakarta, Indonesia.
³ Department of Chemical Engineering, Faculty of Industrial Engineering, Universitas Pertamina, Jl. Teuku Nyak Arief, Simprug Kebayoran, South Jakarta, Indonesia.
⁴ Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Sriwijaya, Jl. Raya Palembang Prabumulih KM 32, Indralaya-Ogan Ilir, Indonesia.
⁵ Department of Physics, IPB University, Bogor, 16680, Indonesia.

Abstract

A novel thioesterse gene was successfully cloned and sequenced directly from natural sample of Domas Hot Spring, West Java, Indonesia. Homological analysis of the sequence showed that the gene appeared high homology to thioesterase genes with the highest to a putative thioesterase gene from uncultured Acidilobus sp. JCHS at 66% identity. However, phylogenetic analysis showed that the protein was separated from the branch with other known thioesterases. The size of the gene is around 500 base pairs, lied into 2 kb DNA fragment from a random PCR amplicon. The gene was overexpressed in Escherichia coli, a dominant band appeared at 17 kDa in SDS-PAGE with expression level at around 32% of total proteins. The activity of the purified protein using acetyl-CoA as substrate showed that the protein exhibited thioesterase activity. Furthermore, the enzyme also showed esterase activity on p-nitrophenyl ester as substrate. Detail characterization of esterolytic activity showed that the enzyme preferred p-nitrophenyl decanoate as substrate. The optimum activity of the enzyme was at 80 °C and pH 8. Activity of the enzyme was maintained after incubation at 80 °C up to 24 h. In addition, the enzyme was favorable on polar organic solvents. All the data obtained suggested that the enzyme is a novel alkaline thermostable thioesterase.

Keywords: Cloning; Expression; Extreme thermostable; Natural sample; Thioesterase.