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Characterization of a Theme C Glycoside Hydrolase Family 9 Endo-Beta-Glucanase from a Biogas Reactor Metagenome

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Abstract

From a biogas reactor metagenome an ORF (bp_cel9A) encoding a bacterial theme C glycoside hydrolase family 9 (GH9) enzyme was recombinantly produced in E. coli BL21 pQE-80L. BP_Cel9A exhibited ≤ 55% identity to annotated sequences. Subsequently, the enzyme was purified to homogeneity by affinity chromatography. The endo-beta-glucanase BP_Cel9A hydrolyzed the beta-1,3–1,4-linked barley beta-glucan with 24 U/mg at 30 °C and pH 6.0. More than 62% of activity was measured between 10 and 40 °C. Lichenan and xyloglucan were hydrolyzed with 67% and 40% of activity, respectively. The activity towards different substrates varied with different temperatures. However, the enzyme activity on CMC was extremely low (> 1%). In contrast to BP_Cel9A, most GH9 glucanases act preferably on crystalline or soluble cellulose with only side activities towards related substrates. The addition of calcium or magnesium enhanced the activity of BP_Cel9A, especially at higher temperatures. EDTA inhibited the enzyme, whereas EGTA had no effect, suggesting that Mg2+ may adopt the function of Ca2+. BP_Cel9A exhibited a unique substrate spectrum when compared to other GH9 enzymes with great potential for mixed-linked glucan or xyloglucan degrading processes at moderate temperatures.

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Acknowledgements

Thanks are due to the BENAS Biogasanlage GmbH for the possibility of sampling the biogas plant.

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Authors and Affiliations

  1. Institute of Technical Microbiology, Hamburg University of Technology (TUHH), 21073, Hamburg, Germany

    Carola Schröder, Christin Burkhardt, Philip Busch & Garabed Antranikian

  2. Clariant Produkte (Deutschland) GmbH, Group Biotechnology, 81477, Munich, Germany

    Georg Schirrmacher & Jörg Claren

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  1. Carola Schröder
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  2. Christin Burkhardt
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  3. Philip Busch
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  4. Georg Schirrmacher
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Correspondence to Garabed Antranikian.

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Schröder, C., Burkhardt, C., Busch, P. et al. Characterization of a Theme C Glycoside Hydrolase Family 9 Endo-Beta-Glucanase from a Biogas Reactor Metagenome. Protein J 37, 454–460 (2018). https://doi.org/10.1007/s10930-018-9787-5

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  • DOI: https://doi.org/10.1007/s10930-018-9787-5

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