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Improving the Catalytic Activity and Thermostability of FAST-PETase with a Multifunctional Short Peptide
Jun Yang1, Binyang Deng1, Pingan Liao1
1State Key Laboratory of Biocatalysis and Enzyme Engineering, Hubei Key Laboratory of Industrial Biotechnology, School of Life Sciences, Hubei University, Wuhan 430062, China.
Abstract:
Previous reports indicated that self-assembling amphipathic peptide S1v1 (AEAEAHAH)2 significantly enhances the soluble expression, thermostability, and activity of the target proteins when fused to them. In order to obtain high-efficiency enzymes for the large-scale degradation of polyethylene terephthalate (PET), this multifunctional peptide was fused to the N- and C-terminus of FAST-PETase, a variant of Ideonella sakaiensis PETase (IsPETase), with a PT-linker (TTVTTPQTS) harbored between the target protein and the multifunctional peptide. Consistent with previous reports, S1v1 increased the solubility of FAST-PETase slightly. Moreover, it increased the activity of FAST-PETase dramatically. The amount of terephthalic acid (TPA) and mono(2-hydroxyethyl) terephthalic acid (MHET) released from PET substrate after 24 h of digestion at 50°C by fusion enzymes bearing N- and C-terminal S1v1 tag was approximately 2.9- and 4.6-fold that of FAST-PETase, respectively. Furthermore, the optimal temperature and thermostability of the fusion proteins increased in comparison with FAST-PETase. The present study provides a novel strategy to improve the depolymerization efficiency of FAST-PETase.
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