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Identification of three distinct Clostridium thermocellum xylanase genes by molecular cloning

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Abstract

Three genes coding for xylanase synthesis in Clostridium thermocellum were cloned and expressed in Escherichia coli. Genomic DNA from Clostridium thermocellum was digested to completion with HindIII, BamHI, and SalI. The fragments were ligated into the corresponding sites of pUC19 and transformed into Escherichia coli. Two of the genes encoded for xylanases which depolymerized xylans but were unable to extensively convert these substrates to reducing sugar. The third gene encoded for an enzyme that extensively hydrolyzed xylan. The insert containing the latter gene was subjected to extensive mapping and was found to encode for a xylanase with a molecular weight of approximately 25,000. The protein product of the cloned gene was obtained in a relatively pure form by heat treatment, ion exchange and gel permeation steps. The enzyme was quite stable to high temperatures with a half-life of 24 h at 70°C.

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Authors and Affiliations

  1. Division of Biological Sciences, National Research Council of Canada, K1A OR6, Ottawa, Ontario, Canada

    C. Roger MacKenzie, Robert C. A. Yang, Girishchandra B. Patel, Doris Bilous & Saran A. Narang

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  1. C. Roger MacKenzie
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  2. Robert C. A. Yang
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  3. Girishchandra B. Patel
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  4. Doris Bilous
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  5. Saran A. Narang
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Issued as National Research Council of Canada No. 30545

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MacKenzie, C.R., Yang, R.C.A., Patel, G.B. et al. Identification of three distinct Clostridium thermocellum xylanase genes by molecular cloning. Arch. Microbiol. 152, 377–381 (1989). https://doi.org/10.1007/BF00425176

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  • DOI: https://doi.org/10.1007/BF00425176

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