Inventors:
Elena Brevnova - Lebanon NH, US
John E. McBride - Lyme NH, US
Erin Wiswall - Danbury NH, US
Kevin S. Wenger - Hanover NH, US
Nicky Caiazza - Lebanon NH, US
Heidi Hau - Lebanon NH, US
Aaron Argyros - White River Junction VT, US
Frank Agbogbo - Lebanon NH, US
Charles F. Rice - Hopkinton NH, US
Trisha Barrett - Bradford VT, US
John S. Bardsley - Newport NH, US
Abigail S. Foster - South Strafford VT, US
Anne K. Warner - Lebanon NH, US
Mark Mellon - Grantham NH, US
Ryan Skinner - White River Junction VT, US
Indraneel Shikhare - Lebanon NH, US
Riaan Den Haan - Vierlanden, ZA
Chhayal V. Gandhi - Lebanon NH, US
Alan Belcher - Nashua NH, US
Vineet B. Rajgarhia - Courbevoie, FR
Allan C. Froehlich - Lebanon NH, US
Kristen M. Deleault - Canaan NH, US
Emily Stonehouse - Lebanon NH, US
Shital A. Tripathi - Berkley CA, US
Jennifer Gosselin - Lebanon NH, US
Yin-Ying Chiu - West Lebanon NH, US
Haowen Xu - Lebanon NH, US
Assignee:
Mascoma Corporation - Lebanon NH
International Classification:
C12N 15/81
Abstract:
The present invention is directed to a yeast strain, or strains, secreting a full suite, or any subset of that full suite, of enzymes to hydrolyze corn starch, corn fiber, lignocellulose, (including enzymes that hydrolyze linkages in cellulose, hemicellulose, and between lignin and carbohydrates) and to utilize pentose sugars (xylose and arabinose). The invention is also directed to the set of proteins that are well expressed in yeast for each category of enzymatic activity. The resulting strain, or strains can be used to hydrolyze starch and cellulose simultaneously. The resulting strain, or strains can be also metabolically engineered to produce less glycerol and uptake acetate. The resulting strain, or strains can also be used to produce ethanol from granular starch without liquefaction. The resulting strain, or strains, can be further used to reduce the amount of external enzyme needed to hydrolyze a biomass feedstock during an Simultaneous Saccharification and Fermentation (SSF) process, or to increase the yield of ethanol during SSF at current saccharolytic enzyme loadings. In addition, multiple enzymes of the present invention can be co-expressed in cells of the invention to provide synergistic digestive action on biomass feedstock. In some aspects, host cells expressing different heterologous saccharolytic enzymes can also be co-cultured together and used to produce ethanol from biomass feedstock.
