Polypeptide having .alpha.-isomaltosylglucosaccharide...

C - Chemistry – Metallurgy – 12 – N

Patent

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C12N 15/56 (2006.01) C12N 1/21 (2006.01) C12N 9/10 (2006.01) C12N 9/24 (2006.01) C12N 15/31 (2006.01) C12N 15/54 (2006.01) C12P 19/00 (2006.01) C12P 19/14 (2006.01) C12P 19/18 (2006.01) C12P 21/02 (2006.01)

Patent

CA 2434414

It is intended to provide a polypeptide usable in producing a cyclic tetrasaccharide having a cyclo{.fwdarw.6)-.alpha.-D-glucopyranosyl- (1.fwdarw.3)-.alpha.-D-glucopyranosyl-(1.fwdarw.6)-.alpha.-D-glucopyranosyl- (1.fwdarw.3)-.alpha.-D-glucopyranosyl-(1.fwdarw.} structure, a DNA encoding this polypeptide and use of the same. This object is achieved by establishing a polypeptide capable of transferring .alpha.-glucosyl from a saccharide having an .alpha.-1,4-glycosyl bond as a binding manner at the non-reducing end and showing a degree of glucose polymerization of 2 or above to thereby synthesizing a saccharide having an .alpha.-1,6-glucosyl binding manner as a binding manner at the non-reducing end and an .alpha.-1,4-glycosyl bond as a binding manner other than at the non-reducing end and showing a degree of glucose polymerization of 3 or above without substantially elevating the reducing intensity; a DNA encoding this polypeptide; a replicable recombinant DNA containing the DNA encoding the above polypeptide and an autonomously replicable vector; a transformant constructed by transferring this recombinant DNA into an appropriate host; a process for producing the polypeptide; and use thereof.

L'objectif de la présente invention est de mettre au point un polypeptide qui puisse être utilisé dans la production d'un tétrasaccharide cyclique présentant une structure de cyclo{.fwdarw.6)-.alpha.-D-glucopyranosyl-(1.fwdarw.3)-.alpha.-D-glucopyranosyl-(1.fwdarw.6)-.alpha.-D-glucopyranosyl-(1.fwdarw.3)-.alpha.-D-glucopyranosyl-(1.fwdarw.}, un ADN codant ce polypeptide, ainsi que l'utilisation de ce dernier. A cette fin, on a mis au point un polypeptide qui peut transférer de l'.alpha.-glucosyl d'un saccharide présentant une liaison .alpha.-1,4-glucosyl sous forme de liaison à l'extrémité non réductrice et qui présente un degré de polymérisation de glucose supérieur ou égal à 2, afin de synthétiser un saccharide qui présente une liaison .alpha.-1,6-glucosyl servant de liaison à l'extrémité non réductrice et une liaison .alpha.-1,4-glucosyl servant de liaison ailleurs qu'à l'extrémité non réductrice et qui présente un degré de polymérisation de glucose supérieur ou égal à 3, sans élever sensiblement l'intensité de réduction. La présente invention concerne également un ADN codant ce polypeptide, un ADN de recombinaison reproductible, qui contient l'ADN codant ledit polypeptide et un vecteur à reproduction autonome, un transformant établi par transfert dudit ADN de recombinaison chez un hôte adéquat, ainsi qu'un procédé de production du polypeptide et son utilisation.

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