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Cloning and Characterization of an Inulinase Gene From the Marine Yeast Candida membranifaciens subsp. flavinogenie W14-3 and Its Expression in Saccharomyces sp. W0 for Ethanol Production

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Abstract

The INU1 gene encoding an exo-inulinase from the marine-derived yeast Candida membranifaciens subsp. flavinogenie W14-3 was cloned and characterized. It had an open reading frame of 1,536 bp long encoding an inulinase. The coding region of it was not interrupted by any intron. The cloned gene encoded 512 amino acid residues of a protein with a putative signal peptide of 23 amino acids and a calculated molecular mass of 57.8 kDa. The protein sequence deduced from the inulinase gene contained the inulinase consensus sequences (WMNDPNGL), (RDP), ECP FS and Q. The protein also had six conserved putative N-glycosylation sites. The deduced inulinase from the yeast strain W14-3 was found to be closely related to that from Candida kutaonensis sp. nov. KRF1, Kluyveromyces marxianus, and Cryptococcus aureus G7a. The inulinase gene with its signal peptide encoding sequence was subcloned into the pMIRSC11 expression vector and expressed in Saccharomyces sp. W0. The recombinant yeast strain W14-3-INU-112 obtained could produce 16.8 U/ml of inulinase activity and 12.5 % (v/v) ethanol from 250 g/l of inulin within 168 h. The monosaccharides were detected after the hydrolysis of inulin with the crude inulinase (the yeast culture). All the results indicated that the cloned gene and the recombinant yeast strain W14-3-INU-112 had potential applications in biotechnology.

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Acknowledgments

This research was supported by Hi-Tech Research and Development Program of China (863) (Grant no. 2012AA021205).

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Authors and Affiliations

  1. Unesco Chinese Center of Marine Biotechnology, Ocean University of China, Yushan Road, No. 5, Qingdao, 266003, China

    Lin-Lin Zhang, Mei-Juan Tan, Guang-Lei Liu, Zhe Chi, Guang-Yuan Wang & Zhen-Ming Chi

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  1. Lin-Lin Zhang
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  2. Mei-Juan Tan
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  3. Guang-Lei Liu
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Correspondence to Zhen-Ming Chi.

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Zhang, LL., Tan, MJ., Liu, GL. et al. Cloning and Characterization of an Inulinase Gene From the Marine Yeast Candida membranifaciens subsp. flavinogenie W14-3 and Its Expression in Saccharomyces sp. W0 for Ethanol Production. Mol Biotechnol 57, 337–347 (2015). https://doi.org/10.1007/s12033-014-9827-0

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