Isolation and characterization of schizochytrium aggregatum...

C - Chemistry – Metallurgy – 12 – N

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C12N 9/42 (2006.01)

Patent

CA 2729924

The present invention provides for the isolation and characterization of the cbhl gene from Schizochytrium aggre-gatum. In particular, the present invention provides for the nucleic acid and amino acid sequences of Schizochytrium aggregatum cbhl, and domains, variants and derivatives thereof. The present invention further provides for the heterologous expression of Schizochytrium aggregatum Cbhl in host cells, including yeast, e.g., Saccharomyces cerevisiae. Expression of Schizochytrium aggregatum Cbhl in host cells will augment cellulose digestion and facilitate ethanol production by those host cells on cellulosic substrates. In certain embodiments, heterologous expression in Saccharomyces cerevisiae is in coordination with heterologous ex-pression of other known, or newly identified saccharolytic enzymes. Therefore, the present invention also provides that the novel Schizochytrium aggregatum Cbhl gene can utilized in a consolidated bioprocessing system.

La présente invention concerne lisolement et la caractérisation du gène cbh1 de Schizochytrium aggregatum. En particulier, la présente invention concerne les séquences dacide nucléique et dacides aminés de Schizochytrium aggregatum Cbh1, et des domaines, variants et dérivés de celles-ci. La présente invention concerne en outre lexpression hétérologue de Schizochytrium aggregatum Cbh1 dans des cellules hôtes, y compris des levures, par exemple, Saccharomyces cerevisiae. Lexpression de Schizochytrium aggregatum Cbh1 dans des cellules hôtes augmente la digestion de la cellulose et facilite la production déthanol par ces cellules hôtes sur des substrats cellulosiques. Dans certains modes de réalisation, lexpression hétérologue dans Saccharomyces cerevisiae est coordonnée avec lexpression hétérologue dautres enzymes saccharolytiques connues ou nouvellement identifiées. Par conséquent, la présente invention propose en outre que le nouveau gène Schizochytrium aggregatum Cbh1 puisse être utilisé dans un système de bioproduction consolidé.

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