Methods for producing sialyloligosaccharides in a dairy source

A - Human Necessities – 01 – K

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A01K 67/027 (2006.01) C12N 9/24 (2006.01) C12N 15/09 (2006.01) C12N 15/85 (2006.01) C12P 1/00 (2006.01) C12P 19/04 (2006.01) C12P 19/26 (2006.01) G01N 33/00 (2006.01)

Patent

CA 2300308

The present invention provides methods for producing sialyloligosaccharides in situ in dairy sources and cheese processing waste streams, prior to, during, or after processing of the dairy source during the cheese manufacturing process. The methods of the present invention use the catalytic activity of .alpha.(2-3) trans-sialidases to exploit the high concentrations of lactose and .alpha.(2-3) sialosides which naturally occur in dairy sources and cheese processing waste streams to drive the enzymatic synthesis of .alpha.(2-3) sialyllactose. .alpha.(2-3) sialyloligosaccharides produced according to these methods are additionally encompassed by the present invention. The invention also provides for recovery of the sialyloligosaccharides produced by these methods. The invention further provides a method for producing .alpha.(2-3) sialyllactose. The invention additionally provides a method of enriching for .alpha.(2-3) sialyllactose in milk using transgenic mammals that express an .alpha.(2-3) trans-sialidase transgene. The invention also provides for recovery of the sialyllactose contained in the milk produced by this transgenic mammal either before or after processing of the milk. Transgenic mammals containing an .alpha.(2-3) trans-sialidase encoding sequence operably linked to a regulatory sequence of a gene expressed in mammary tissue are also provided by the invention.

L'invention se rapporte à des procédés permettant de produire des sialyloligosaccharides in situ dans des sources de lait et des flux de déchets de traitement de fromages avant, pendant, ou après le traitement de la source de lait et ce, au cours du processus de fabrication du fromage. Les procédés selon l'invention consistent à utiliser l'activité catalytique de .alpha.(2-3) trans-sialidases pour exploiter les concentrations élevées en lactose et l'activité catalytique de .alpha.(2-3) sialosides, naturelle dans des sources de lait et des flux de déchets de traitement de fromages, pour entraîner la synthèse enzymatique de .alpha.(2-3) sialyllactose. L'invention concerne en outre les .alpha.(2-3) sialyloligosaccharides produits selon ces procédés. L'invention se rapporte également à la récupération de sialyloligosaccharides produits selon ces procédés; à un procédé permettant de produire du .alpha.(2-3) sialyllactose; à un procédé permettant d'enrichir du lait en .alpha.(2-3) sialyllactose grâce à l'utilisation de mammifères transgéniques exprimant un transgène de .alpha.(2-3) trans-sialidase; à la récupération du sialyllactose contenu dans le lait produit par ce mammifère transgénique avant ou après le traitement de ce lait; enfin, à des mammifères transgéniques renfermant une séquence codante de la .alpha.(2-3) trans-sialidase reliée de manière fonctionnelle à une séquence régulatrice d'un gène exprimé dans des tissus mammaires.

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