Insights into enhanced thermostability of a cellulosomal enzyme

Johanna Stern, Michael Anbar, Sarah Moraïs, Raphael Lamed, Edward A. Bayer

Research output: Contribution to journalArticlepeer-review

Abstract

Improved stability of cellulosomal enzymes is of great significance in order to provide efficient degradation of cellulosic derivatives for production of biofuels. In previous reports, we created a quadruple mutant of the endoglucanase Cel8A from Clostridium thermocellum resulting from a combination of both random error-prone PCR and a bioinformatics-based consensus mutagenesis approach. The quadruple mutant exhibited an increased half-life of activity by 14-fold at 85 °C with no apparent loss of catalytic activity compared to the wild-type form. Connection of the wild-type enzyme to its respective cohesin partner conferred increased thermostability, but no increase was observed for the cohesin-complexed mutant enzyme. The mutant and the wild-type enzymes were integrated into divalent chimeric scaffoldins with a family 48 exoglucanase partner, and the cellulose-degradation activities of resultant designer cellulosomes were examined. Despite the heightened thermostability of the mutant as a free enzyme, its substitution for the wild-type endoglucanase within the cellulosome context failed to exhibit an improvement in overall degradation of cellulose.

Original languageEnglish
Pages (from-to)78-84
Number of pages7
JournalCarbohydrate Research
Volume389
Issue number1
DOIs
StatePublished - 7 May 2014

Keywords

  • Cellulosome
  • Cohesin
  • Dockerin
  • Endoglucanase
  • Exoglucanase
  • Thermostability

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