摘要:
The invention relates to transformed microalgae capable of expressing glycosylated polypeptides and methods for producing said transformed microalgae and producing glycosylated polypeptides.
摘要:
An essentially pure substance has a structure of a Nod factor or one of its analogues. The Nod factor is characterized by the fact that its biosynthesis is controlled by at least one nodulation gene (nodA,B,C) common to the Rhizobiaceae, in particular to the genera Rhezobium, Bradyrhizobium, Sinorhizobium and Azorhizobium. This substance consists of a lipo-oligosaccharide which is not a derivative of the exopolysaccharides and which has the general formula (I). In formula (I), the Nod factor of which it has the strucutre is a plant-specific symbiotic signal and is capable of enhancing the capacity of the bacteria to infect the host plant with which it is associated and/or of accelerating the formation of nodules on the host plant with which it is associated and/or of inducing the transcription of symbiotic genes of the Leguminoseae. Applications to the treatment of plants and as an active therapeutic agent in humans and animals. G stands for a hexosamine variously substituted, for example by an acetyl group on the nitrogen, a sulphate group, an acetyl group and/or an ether group on oxygen R1, R2, R3, R5, R6, R7, which may be identical or different, stand for H, CH3CO-, CXHYCO- where X is a whole number between 0 and 17 and Y is a whole number between 1 and 35, or any other acyl group, for example a carbamyl groupe, R4 stands for a saturated or mono-, di, or tri-unsaturated aliphatic chain containing at least 12 carbon atoms and n is a whole number between 1 and 4.
摘要:
Substance sensiblement pure présentant la structure d'un facteur Nod ou de l'un de ses analogues, lequel facteur Nod se caractérise par le fait que sa biosynthèse est sous le contrôle d'au moins un gène de nodulation (nodA,B,C) commun aux Rhizobiacées, en particulier aux genres Rhizobium, Bradyrhizobium, Sinorhizobium et Azorhizobium. Cette substance est constituée par un lipo-oligosaccharide non dérivé des exopolysaccharides et répond à la formule générale (I). Le facteur Nod dont elle présente la structure est un signal symbiotique plante-spécifique et est apte à amplifier la capacité de la bactérie à infecter la plante-hôte à laquelle il est associé et/ou à accélérer la formation de nodules sur la plante-hôte à laquelle il est associé et/ou à induire la transcription de gènes symbiotiques de Légumineuses. Applications au traitement de plantes et en tant qu'agent thérapeutique actif chez l'Homme et chez l'animal. La formule (I) dans laquelle: G est une hexosamine diversement substituée, par exemple, par un groupe acétyl sur l'azote, un groupe sulfate, un groupe acétyl et/ou un groupe éther sur un oxygène, R1, R2, R3, R5, R6, R7, qui peuvent être identiques ou différents, représentent H, CH3CO-, CXHYCO- où X est un nombre entier compris entre 0 et 17, et Y est un nombre entier compris entre 1 et 35, ou tout autre groupe acyl, tel que par exemple un carbamyl, R4 représente une chaîne aliphatique saturée ou mono-, di-, ou tri-insaturée comportant au moins 12 atomes de carbone, et n est un nombre entier compris entre 1 et 4.
摘要:
A method for synthesizing a protein of interest with a modified N-glycosylation profile within a plant, a portion of a plant, or a plant cell is provided. The method comprises co-expressing within a plant a nucleotide sequence encoding a first nucleotide sequence encoding a hybrid protein (GNT1-GalT) comprising a CTS domain of N-acetylglucosaminyl transferase (GNT1) fused to a catalytic domain of beta-1,4galactosyltransferase (GalT), the first nucleotide sequence operatively linked with a first regulatory region that is active in the plant, and a second nucleotide sequence for encoding the protein of interest, the second nucleotide sequence operatively linked with a second regulatory region that is active in the plant. The first and second nucleotide sequences are co-expressed to synthesize a protein of interest comprising glycans with the modified N-glycosylation profile within the plant, the portion of the plant, or the plant cell.
摘要:
A method of synthesizing sialic acid in plants, and plants capable of synthesizing sialic acid is provided. Furthermore, a method of producing sialylated protein in a plant is also provided. The method to synthesize sialic acid comprises providing a plant comprising a nucleotide sequence encoding N-acetyl neuraminic acid (Neu5Ac) synthase or Neu5Ac lyase, and expressing the nucleotide sequence thereby synthesizing sialic acid. The plant may also co-express a nucleotide sequence encoding one or more than one of an epimerase, a CMP-Neu5Ac synthase, a CMP-Neu5Ac transporter and a sialyltransferase.
摘要:
The present invention concerns transformed Phaeodactylum tricomutum comprising a nucleic acid sequence operatively linked to a promoter, wherein said nucleic acid sequence encodes an N-acetylglucosaminyltransferase I and/or an a-Mannosidase II and wherein at least one β-Ν-acetylglucosaminidase of said transformed Phaeodactylum tricomutum has been inactivated; a method for producing a glycosylated polypeptide, said method comprising the steps of (i) culturing a transformed P. tricomutum as defined previously and (ii) purifying said polypeptide that is expressed and glycosylated in said transformed P. tricomutum; and the use of such a transformed P. tricomutum for producing a glycosylated polypeptide.