Functional expression of cellobiohydrolases in Saccharomyces cerevisiae towards one-step conversion of cellulose to ethanol

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dc.contributor.authorDen Haan, Riaan
dc.contributor.authorMcbride, John E.
dc.contributor.authorLa Grange, Daniel C.
dc.contributor.authorLynd, Lee R.
dc.contributor.authorVan Zyl, Willem H.
dc.date.accessioned2011-04-07T08:24:52Z
dc.date.available2011-04-07T08:24:52Z
dc.date.issued2006-09
dc.descriptionThe original publication is available at www.elsevier.com.
dc.descriptionIncludes bibliography.
dc.description.abstractTo investigate the possible use of Saccharomyces cerevisiae as a candidate for consolidated bioprocessing (CBP) of cellulose to ethanol, four fungal cellobiohydrolase (CBH) encoding genes (Trichoderma reesei cbh1 and cbh2, Aspergillus niger cbhB and Phanerochaete chrysosporium cbh1–4) were expressed in this yeast. All four CBHs were successfully expressed and similar extracellular activity was demonstrated on phosphoric acid swollen cellulose (PASC) and bacterial microcrystalline cellulose (BMCC) using a modified affinity digestion procedure. Our results suggest that although heterologous CBHs can be produced in S. cerevisiae the titers of functionally secreted CBH are relatively low. However, the specific activity of recombinant CBH1 on PASC and BMCC, determined by a sensitive ELISA-based technique, was found not to differ significantly from that of the native T. reesei enzyme. Given this similarity in specific activity, but the disparity between current levels of CBH expression relative to expression levels required to enable growth on crystalline cellulosic substrates with concomitant ethanol production, future studies should aim to increase the expression levels of CBHs.en_ZA
dc.format.extentp. 1291–1299 : ill.
dc.identifier.citationDen Haan, Riaan, Mcbride, John E., La Grange, Daniel C., Lynd, Lee R., Van Zyl, Willem H. 2007. Enzyme and Microbial Technology, 40:1291-1299, doi:10.1016/j.enzmictec.2006.09.022, http://www.sciencedirect.com.ez.sun.ac.za/science?_ob=MImg&_imagekey=B6TG1-4M4002V-2-9&_cdi=5241&_user=613892&_pii=S0141022906004947&_origin=search&_coverDate=04%2F03%2F2007&_sk=999599994&view=c&wchp=dGLzVtb-zSkzV&md5=e6573e23c4d2cc9fdd447634ab5bc868&ie=/sdarticle.pdfen_ZA
dc.identifier.issn0141-0229
dc.identifier.otherdoi:10.1016/j.enzmictec.2006.09.022
dc.identifier.urihttp://hdl.handle.net/10019.1/8484
dc.language.isoen_USen_ZA
dc.publisherElsevieren_ZA
dc.rights.holderElsevieren_ZA
dc.subjectCBPen_ZA
dc.subjectCellobiohydrolaseen_ZA
dc.subjectCellulaseen_ZA
dc.subjectExpressionen_ZA
dc.subjectYeasten_ZA
dc.subjectCBHen_ZA
dc.subjectActivityen_ZA
dc.subjectConsolidated bioprocessingen_ZA
dc.subjectSaccharomyces cerevisiaeen_ZA
dc.subjectSaccharomyces cerevisiaeen_ZA
dc.subjectEthanolen_ZA
dc.titleFunctional expression of cellobiohydrolases in Saccharomyces cerevisiae towards one-step conversion of cellulose to ethanolen_ZA
dc.typeArticleen_ZA
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