Directed evolution of grg31 and grg36 epsp synthase enzymes

C - Chemistry – Metallurgy – 12 – N

Patent

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C12N 9/10 (2006.01) C12N 15/82 (2006.01)

Patent

CA 2713869

Compositions and methods for conferring herbicide resistance or tolerance to bacteria, plants, plant cells, tissues and seeds are provided. Compositions include polynucleotides encoding herbicide resistance or tolerance polypeptides, vectors comprising those polynucleotides, and host cells comprising the vectors. The nucleotide sequences of the invention can be used in DNA constructs or expression cassettes for transformation and expression in organisms, including microorganisms and plants. Compositions also include transformed bacteria, plants, plant cells, tissues, and seeds. In particular, isolated polynucleotides en-coding glyphosate resistance or tolerance polypeptides are provided, particularly polypeptide variants of SEQ ID NO:2 and 4. Ad-ditionally, amino acid sequences corresponding to the polynucleotides are encompassed. In particular, the present invention pro-vides for isolated polynucleotides containing nucleotide sequences encoding the amino acid sequence shown in SEQ ID NO:7-28, or the nucleotide sequence set forth in SEQ ID NO:29 or 30.

Cette invention concerne des compositions et des procédés permettant de conférer une résistance ou une tolérance aux herbicides à des bactéries, des plantes, des cellules végétales, des tissus et des graines. Les compositions comprennent des polynucléotides codant une résistance ou une tolérance aux herbicides, des polypeptides, des vecteurs comprenant ces polynucléotides et des cellules hôtes comprenant les vecteurs. Les séquences nucléotidiques de linvention peuvent être utilisées dans des constructions dADN ou des cassettes dexpression pour la transformation et lexpression dans des organismes, y compris des micro-organismes et des plantes. Les compositions comprennent également des bactéries, des plantes, des cellules végétales, des tissus et des graines transformés. Linvention concerne en particulier des polynucléotides isolés codant des polypeptides à résistance ou à tolérance au glyphosate, en particulier des variants polypeptidiques de séquence SEQ ID NO:2 et 4. Linvention concerne par ailleurs des séquences dacides aminés correspondant aux polynucléotides. Linvention concerne en outre des polynucléotides isolés contenant des séquences nucléotidiques codant les séquences dacides aminés présentées en séquences SEQ ID NO:7 à 28, ou la séquence nucléotidique présentée en séquence SEQ ID NO:29 ou 30.

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