Manipulation of snf1 protein kinase activity for altered oil...

C - Chemistry – Metallurgy – 12 – N

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C12N 1/19 (2006.01) A23D 9/00 (2006.01) C12N 15/09 (2006.01) C12N 15/54 (2006.01) C12N 15/81 (2006.01) C12P 7/64 (2006.01) C12N 9/12 (2006.01)

Patent

CA 2734264

Methods of increasing the total lipid content in a eukaryotic cell, the total content of polyunsaturated fatty acids [PUFAs], and/or the ratio of desaturated fatty acids to saturated fatty acids by reducing the activity of the heterotrimeric SNF1 protein kinase are disclosed. Preferably, the chromosomal genes encoding the Snf1 x-subunit, Gal83 .beta.-subunit or Snf4 .gamma.-subunit of the SNF1 protein kinase, the upstream regulatory genes encoding Sak1, Hxk2, Glk1 or Reg1, or the downstream genes encoding Rme1, Cbr1 or Snf3 are manipulated in a PUFA-producing strain of the oleaginous yeast Yarrowia lipolytica, resulting in increased total lipid content, as compared to the parent strain comprising the heterotrimeric SNF1 protein kinase not having reduced activity.

La présente invention concerne des procédés permettant daugmenter la teneur totale en lipides dans une cellule eucaryote, la teneur totale en acides gras polyinsaturés [PUFA], et/ou le rapport entre les acides gras  désaturés et les acides gras saturés par réduction de lactivité de la protéine kinase hétérotrimérique SNF1. De préférence, les gènes chromosomiques codant pour la sous-unité Snf1 ?, la sous-unité Gal83 ß ou la sous-unité Snf4 ? de la protéine kinase SNF1, les gènes régulateurs en amont codant pour Sak1, Hxk2, Glk1 ou Reg1, ou les gènes en aval codant pour Rme1, Cbr1 ou Snf3 sont manipulés dans une souche de la levure oléagineuse Yarrowia lipolytica produisant des PUFA, aboutissant à une augmentation de la teneur totale en lipides, par comparaison avec la souche parente comprenant la protéine kinase hétérotrimérique SNF1 dont lactivité na pas été réduite.

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