Transgenic systems for the manufacture of...

C - Chemistry – Metallurgy – 12 – N

Patent

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Details

C12N 15/52 (2006.01) A01H 5/00 (2006.01) C08G 63/06 (2006.01) C12N 1/21 (2006.01) C12N 9/04 (2006.01) C12N 9/10 (2006.01) C12N 9/88 (2006.01) C12N 15/90 (2006.01) C12P 7/62 (2006.01)

Patent

CA 2360801

Methods for engineering transgenic organisms that synthesize polyhydroxyalkanoates (PHAs) containing 3-hydroxyhexanoate as comonomer have been developed. These processes are based on genetically engineered bacteria such as Escherichia coli or in plant crops as production systems which include PHA biosynthetic genes from PHA producers. In a preferred embodiment of the method, additional genes are introduced in wild type or transgenic polyhydroxybutyrate (PHB) producers, thereby creating new strains that synthesize 3HH monomers which are incorporated into PHAs. The 3HH monomer preferably is derived in microbial systems using butanol or butyrate as feedstocks, which are precursors of 3-hydroxyhexanoyl-CoA. Pathways for in vivo production of butyrol-CoA specifically encompassing butyryl-CoA dehydrogenase activity are provided.

La présente invention concerne des procédés d'obtention par génie génétique d'organismes transgéniques qui synthétisent les polyhydroxyalcanoates (PHA) contenant un comonomère 3-hydroxyhexanoate. Ces procédés sont à base de bactéries issues du génie génétique telles que Escherichia coli ou utilisent comme systèmes de production des productions végétales incluant des gènes biosynthétiques de PHA issus de producteurs de PHA. Pour un mode de réalisation préféré du procédé, des gènes additionnels sont introduits dans des producteurs de polyhydroxybutyrate (PHB) de type sauvage ou transgéniques, ce qui aboutit à la création de nouvelles souches capables de synthétiser les monomères 3HH incorporés dans les PHA. Le monomère 3HH se dérive de préférence dans des systèmes microbiens utilisant comme charge d'alimentation le butanol ou le butyrate constituant les précurseurs du 3-hydroxyhexanoyl-CoA. L'invention concerne enfin des voies de production in vivo de butyrol-CoA englobant spécifiquement l'activité déshydrogénase du butyryl-CoA.

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